Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 141
Filtrar
1.
Tuberculosis (Edinb) ; 132: 102166, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-35091379

RESUMO

Bovine tuberculosis, caused by Mycobacterium bovis (M. bovis), is a globally distributed chronic disease of animals. The bacteria can be transmitted to humans via the consumption of unpasteurised (raw) milk, thus representing an important public health risk. To investigate the risk of zoonotic transmission of M. bovis via raw milk, this study systematically reviewed published studies to estimate the prevalence of M. bovis in on-farm bulk-tank milk (BTM) and individual cow's milk (IM) by meta-analysis. In total, 1,339 articles were identified through seven electronic databases and initially screened using titles and abstracts. The quality of 108 potentially relevant articles was assessed using full texts, and 67 articles comprising 83 studies (76 IM and 7 BTM), were included in the meta-analysis. The prevalence of M. bovis in IM and BTM was summarised according to the diagnostic test used, and the tuberculin skin test (TST) infection status of the individual cows (for IM) or herds (for BTM). Heterogeneity was quantified using the I-squared statistic. Prediction intervals (95% PIs) were also estimated. For IM, the overall prevalence was summarised at 5% (95%CI: 3%-7%). In TST positive cows, prevalence was summarised at 8% (95%CI: 4%-13%). For BTM, the overall prevalence independent of individual herd TST infection status was summarised at 5% (95%CI: 0%-21%). There was considerable heterogeneity evident among the included studies, while PIs were also wide. Inconsistency in the quality of reporting was also observed resulting in missing information, such as the TST infection status of the individual animal/herd. No study reported the number of M. bovis bacteria in test-positive milk samples. Several studies reported the detection of M. tuberculosis and M. africanum in milk. Despite international efforts to control tuberculosis, this study highlights the risk of zoonotic transmission of M. bovis via unpasteurised milk and dairy products made using raw milk.


Assuntos
Indústria de Laticínios/tendências , Leite/microbiologia , Mycobacterium bovis/isolamento & purificação , Animais , Bovinos , Feminino , Prevalência
2.
Trop Anim Health Prod ; 53(2): 258, 2021 Apr 13.
Artigo em Inglês | MEDLINE | ID: mdl-33847844

RESUMO

Despite growing milk demand and imports, market-oriented milk production and formal processing in Ethiopia is limited to areas around Addis Ababa, notwithstanding its competing land use demand. This study assessed biophysical and market potential for developing the dairy sector, characterizing Ethiopian dairy clusters. Biophysical data from geographic information system (GIS) sources and information from key informants were combined in mapping and ranking these clusters on milk production potential. Twenty-four indicators in six major categories were applied for this assessment: feed availability, environmental conditions for dairy cattle, current production status, access to inputs and services, output market access, and production expansion potential. Feed availability (fodder, crop residues, and agro-industrial by-products as well as land availability and affordability) were the main drivers for dairy development, followed by the current production status, mainly driven by number of (improved) dairy cattle and (formal) milk volumes. Dairy clusters close to Addis Ababa had the highest overall scores for development potential, mainly determined by local demand and access to inputs. For dairy sustainable dairy development in Ethiopia, companies seeking long-term opportunities may avoid the Addis Ababa area and develop dairy production and processing in other clusters especially in Amhara and Tigray regions, with good milk production potential but less developed market infrastructure. The combination of biophysical data and key informant knowledge offered key strengths in delivering valuable results within a short time span. It however requires a careful selection of knowledgeable key informants whose expertise cover a broad scope of the dairy value chain.


Assuntos
Indústria de Laticínios/economia , Indústria de Laticínios/tendências , Leite , Fatores Socioeconômicos , Ração Animal/análise , Animais , Bovinos , Etiópia , Feminino , Sistemas de Informação Geográfica
3.
Trop Anim Health Prod ; 53(1): 70, 2021 Jan 04.
Artigo em Inglês | MEDLINE | ID: mdl-33398462

RESUMO

Animal's well-being, growth, and production are modulated by environmental conditions, and managemental practices and can be deleteriously affected by global warming phenomenon. In the recent years, unprecedented climatic fluctuations like sustained higher temperatures and humidity, heat waves, and solar flares have led to economic losses in $ billions to both milk and meat industry. It is estimated that by 2050, the US dairy industry alone will borne more than $1.7 billion loss. As human dependency on animal products like milk, meat, and eggs for nutrition is exponentially rising, there is urgency for maximum production. The high yielding animals are already under tremendous metabolic pressure making them more susceptible to adverse climatic conditions. When exposed to heat stress, livestock display a variety of behavioral and physiological acclimatization as essential survival strategies, but at the cost of decreased milk, meat, or egg production. Most of the studies have explored the heat stress in animals and its effect on different milk productions in a specific region or country. A clear understanding of the impact of global warming on dairy enterprise is yet to be comprehended. So this exploratory study will analyze impact of global warming on current milk production trends, economics, and future perspectives.


Assuntos
Bovinos/fisiologia , Indústria de Laticínios , Cabras/fisiologia , Resposta ao Choque Térmico , Leite/metabolismo , Carneiro Doméstico/fisiologia , Animais , Indústria de Laticínios/economia , Indústria de Laticínios/estatística & dados numéricos , Indústria de Laticínios/tendências
5.
J Dairy Sci ; 104(1): 1203-1219, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-32713704

RESUMO

There is an increasing interest in using precision dairy technologies (PDT) to monitor real-time animal behavior and physiology in livestock systems around the world. Although PDT in adult cattle is extensively reviewed, PDT use for the management of preweaned dairy calves has not been reviewed. We systematically reviewed research on the use and application of precision technologies in calves. Accelerometers have the potential to be used to monitor lying behavior, step activity, and rumination, which are useful to detect changes in behavior that may be indicative of disease, responses to painful procedures, or positive welfare behaviors such as play. Automated calf feeding systems can control delivery of nutritional plans to individualize feeding and weaning of calves; changes in feeding behaviors (such as milk intake, drinking speed, and unrewarded visits) may also be used to identify early onset of disease. The PDT devices also measure physiological and physical attributes in dairy calves. For instance, temperature monitoring devices such as infrared thermography, ruminal boluses, and implanted microchips have been assessed in calves, but no herd management-based commercial system is available. Many other PDT are in development with potential to be used in dairy calf management, such as image and acoustic-based monitoring, real-time location, and use of enrichment items for monitoring positive emotional states. We conclude that PDT have great potential for application in dairy calf management, enabling precise behavioral and physiological monitoring, targeted feeding programs, and identification of calves with poor health or behavioral impairments. We strongly encourage further development and validation of commercially available technologies for on-farm application of the monitoring of dairy calf welfare, performance, and health.


Assuntos
Comportamento Animal , Bovinos/fisiologia , Indústria de Laticínios , Acelerometria/tendências , Acelerometria/veterinária , Animais , Animais Recém-Nascidos , Indústria de Laticínios/tendências , Fazendas , Desmame
6.
J Dairy Sci ; 104(1): 431-442, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33162082

RESUMO

The use of precision technology is increasingly seen as an option to improve productivity, animal welfare, resource use efficiency, and workplace features on dairy farms. There is limited research related to longitudinal adoption patterns of precision dairy technologies and reasons for any patterns. The aim of this analysis was to investigate trends in technology adoption regarding both the amount (number of farms with a technology) and intensity (number of technologies per farm) of adoption. Surveys of parlor technology adoption were conducted on New Zealand dairy farms in 2008, 2013, and 2018, with 532, 500, and 500 respondents, respectively. Technologies were grouped into labor-saving (LS, such as automatic cluster removers) or data-capture (DC, such as in-line milk meters) categories. Trends were examined for farms that had only LS, only DC, or LS+DC technologies. Technology adoption increased over time; the likelihood of technology adoption in 2018 (and 2013 in parentheses) increased by 21 (22), 7 (68), and 378% (165) for LS, DC, and LS+DC technology groups, respectively, compared to 2008. Farms with LS+DC technologies also had a greater proportion of LS technologies compared to non-LS+DC farms, although this relationship declined over the 10-yr period. The use of a rotary versus herringbone parlor was estimated to be associated with 356 and 470% increase in the likelihood of adopting LS technologies and LS+DC, respectively, from 2008 to 2018. Regional differences in adoption were also found, with the likelihood of adopting DC and LS+DC technologies found to be 46 and 59% greater, respectively, in the South Island of New Zealand, compared to the base region of Waikato. The results highlight the importance of understanding spatial and temporal farm characteristics when considering future effect and adoption of precision dairy technologies. For example, the analysis indicates the occurrence of 2 trajectories to technology investment on farms, where larger farms are able to take advantage of technology opportunities, but smaller farms may be constrained by factors such as lack of economies of scale, limited capital to invest, and inability to retrofit technology into aging parlor infrastructure.


Assuntos
Indústria de Laticínios/métodos , Bem-Estar do Animal , Animais , Bovinos , Indústria de Laticínios/estatística & dados numéricos , Indústria de Laticínios/tendências , Fazendeiros , Fazendas , Humanos , Investimentos em Saúde , Leite , Nova Zelândia , Tecnologia
7.
J Dairy Sci ; 103(6): 5746-5758, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32147258

RESUMO

Many contemporary dairy cattle housing practices are at odds with societal perceptions of positive animal welfare. The public (i.e., those external to the dairy industry) typically emphasizes the importance of naturalness for dairy cattle, such as through provision of pasture, freedom of movement, and the ability to interact socially with conspecifics. Yet, in the United States, the majority of lactating dairy cattle are reportedly housed without any access to pasture, and almost 39% of dairy farms use tiestalls, which restrict movement and social interactions. In addition to being in conflict with public expectations, a lack of pasture access and restrictive housing systems are also in conflict with the animals' own motivations, which can adversely affect their welfare. For example, dairy cattle are highly motivated to access pasture and show a reduction in oral stereotypies when allowed on pasture after periods of tethering. Calves housed without social contact have cognitive deficits and exhibit increased fear responses to novelty. We argue that the long-term sustainability of the dairy industry will depend on the extent to which housing systems reflect public concerns and the animals' priorities. The adoption of technologies, such as automated feeders and remote monitoring systems, may represent a means to practically promote the animals' natural behavior while simultaneously improving individualized care. Although older generations of the public may consider technological solutions to be a further deviation from naturalness and a departure from dairy farming's agrarian roots, the definition of "naturalness" for younger generations may well have expanded to include technology. As the buying power shifts to these younger generations, the adoption of technologies that promote natural cattle behaviors may be one means toward reconciling the disconnect between public perceptions of animal welfare and contemporary dairy farming practices.


Assuntos
Bem-Estar do Animal , Bovinos/fisiologia , Indústria de Laticínios/tendências , Abrigo para Animais/tendências , Animais , Comportamento Animal/fisiologia , Feminino , Lactação/fisiologia
8.
J Dairy Sci ; 103(4): 3760-3773, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32037166

RESUMO

Food production including dairy has been associated with environmental impacts and resource use that has been steadily improving when adjusted per unit of product. The objective of this study was to conduct a cradle-to-farm gate environmental impact analysis and resource inventory of the California dairy production system to estimate the change in greenhouse gas emissions and water and land use over the 50-yr period between 1964 and 2014. Using a life cycle assessment according to international standards and the Food and Agriculture Organization of the United Nations guidelines, we analyzed contributions from dairy production in California to global environmental change. Production of 1 kg of energy- and protein-corrected milk (ECM) in California emitted 1.12 to 1.16 kg of CO2 equivalents (CO2e) in 2014 compared with 2.11 kg of CO2e in 1964, a reduction of 45.0 to 46.9% over the last 50 yr, depending on the model used. Greater reductions in enteric methane intensity (i.e., methane production per kilogram of ECM) were observed (reduction of 54.1 to 55.7%) compared with manure GHG (reduction of 8.73 to 11.9%) in 2014 compared with 1964. This was mainly because manure management in the state relies on lagoons for storage, which has a greater methane conversion factor than solid manure storage. Water use intensity was reduced by 88.1 to 89.9%, with water reductions of 88.7 to 90.5% in crop production, 55.3 to 59.2% in housing and milking, and 52.4 to 54% in free water intake. Improved crop genetics and management have contributed to large efficiencies in water utilization. Land requirements for crop production were reduced by 89.4 to 89.7% in 2014 compared with 1964. This was mainly due to dramatic increases in crop yields in the last 50 yr. The increases in milk production per cow through genetic improvements and better nutrition and animal care have contributed to reductions in greenhouse gas emissions and land and water usage when calculated per unit of production (intensity) basis.


Assuntos
Indústria de Laticínios/tendências , Meio Ambiente , Gases de Efeito Estufa/metabolismo , Leite/metabolismo , Água/metabolismo , Ração Animal/classificação , Ração Animal/normas , Criação de Animais Domésticos/normas , Criação de Animais Domésticos/tendências , Animais , California , Bovinos , Produção Agrícola/tendências , Produtos Agrícolas/crescimento & desenvolvimento , Indústria de Laticínios/normas , Fazendas , Feminino , Aquecimento Global , Esterco , Metano/biossíntese , Metano/metabolismo , Leite/normas , Gravidez , Gerenciamento de Resíduos/normas
9.
Anim Health Res Rev ; 21(1): 36-49, 2020 06.
Artigo em Inglês | MEDLINE | ID: mdl-32051050

RESUMO

Mastitis is among the most common and challenging diseases of dairy animals. It is an inflammation of udder tissues due to physical damage, chemical irritation, or infection caused by certain pathogens. Bovine mastitis has been known for ages, but its complex etiology and multi-factorial nature make it difficult to control. Mastitis may have a negative impact on human health by inducing antibiotic-resistant pathogens that may spread, which is threatening. Researchers are continuously struggling to devise suitable methods for mastitis control. Management strategies are mainly focused on disease prevention by farm management which includes proper hygiene, trained staff to monitor minor changes in the udder or milk, and better diagnostic and treatment methods. New technologies which have the potential to unravel this complicated disease include improved diagnostic tools, based on advanced genomics or proteomics, prevention, based on vaccines and immune modulators, and metabolic products of probiotics such as bacteriocins and gene therapy.


Assuntos
Infecções Bacterianas , Mastite Bovina , Animais , Infecções Bacterianas/diagnóstico , Infecções Bacterianas/microbiologia , Infecções Bacterianas/prevenção & controle , Infecções Bacterianas/transmissão , Bovinos , Indústria de Laticínios/tendências , Farmacorresistência Bacteriana , Humanos , Glândulas Mamárias Animais/microbiologia , Mastite Bovina/diagnóstico , Mastite Bovina/epidemiologia , Mastite Bovina/microbiologia , Mastite Bovina/prevenção & controle , Leite/microbiologia , Patologia Molecular , Prevalência , Probióticos
10.
Vet Parasitol ; 277: 108992, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31835054

RESUMO

Eprinomectin (EPM) has been recently granted a marketing authorisation in the European Union for use in goats, with a zero-day milk withdrawal period. Considering the high prevalence of benzimidazole resistance worldwide and the economic implications of managing milk residues, EPM may today be considered the main (or even the only) affordable treatment option, at least in dairy goats in the EU. However, the chosen dose (1 mg/kg) seems to be suboptimal, especially for lactating goats, and the chosen route of administration (Pour-on) highly subject to inter-individual variability. Considering the scarcity of anthelmintic resources, such a dosage regimen might threat the sustainability of this crucial drug in goat milk production and needs to be urgently discussed and reassessed.


Assuntos
Indústria de Laticínios/normas , Doenças das Cabras/tratamento farmacológico , Ivermectina/análogos & derivados , Animais , Anti-Helmínticos/administração & dosagem , Indústria de Laticínios/legislação & jurisprudência , Indústria de Laticínios/tendências , União Europeia , Feminino , Cabras , Ivermectina/administração & dosagem
11.
PLoS One ; 14(12): e0224949, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31877140

RESUMO

BACKGROUND: Antimicrobials are used as a measure to maintain good health and productivity of lactating cows. This study assessed pastoralists' knowledge and practices regarding AMU in lactating cows; and risk pathways for AMR dissemination from cow milk to humans. METHODS: Interview questionnaire-based cross-sectional study was conducted in Fulani pastoral communities. Frequencies and proportions were used for descriptive statistics. Chi-square test and multivariable logistic regressions were used for analytic statistics at 95% confidence level. RESULTS: All recruited 384 pastoral households participated. About 11% of participants indicated antimicrobials misuse as when given at under-dose, while 58.9% had no knowledge of what antimicrobial misuse entailed. Most participants (51.6%) were unaware about effects of improper AMU. Most respondents (61.7%) reported self-prescription of antimicrobials used on cows. Also, 67.4% of respondents reported arbitrary applications of antimicrobials used in cows, while 15% used antimicrobials to increase milk yield. Frequently used antimicrobials were: tetracycline (98.7%), penicillin (96.6%), streptomycin (95.8%) and sulfonamides (95.3%). Consumption of raw milk and milk products (p = 0.010); contacts with contaminated udder (p = 0.002); and aerosols of discarded contaminated milk P = 0.001) were perceived risk pathways for spread of antimicrobial resistance from cow milk. Improper AMU (p<0.001), non-enforcement of regulating laws (p<0.001), weak financial status (p<0.001), and low education and expertise (p<0.001) influenced antimicrobials misuse in lactating cows. CONCLUSIONS: This study highlighted low levels of knowledge, risk perceptions and practices regarding AMU and AMR among survey pastoralists. This calls for education of the vulnerable populations on promotion of prudent AMU in lactating cows through 'One Health' approach, to assure food safety, food security, and public and environmental health.


Assuntos
Anti-Infecciosos/farmacologia , Doenças dos Bovinos/tratamento farmacológico , Indústria de Laticínios/tendências , Animais , Antibacterianos/uso terapêutico , Bovinos , Estudos Transversais , Feminino , Lactação/efeitos dos fármacos , Glândulas Mamárias Animais/efeitos dos fármacos , Mastite Bovina/tratamento farmacológico , Leite/efeitos dos fármacos , Nigéria , Saúde Pública , Inquéritos e Questionários
12.
PLoS One ; 14(9): e0222442, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31509595

RESUMO

Understanding farmers' behavior, motivations, and perceptions toward antimicrobial use can influence how veterinarians translate research into practice and guide effective ways of implementing protocols. A multidisciplinary team investigated behavioral tendencies of New York dairy farmers toward antimicrobial use by administering a survey modeled with the reasoned action approach. This approach is a framework from social psychology containing the constructs attitude, perceived norms, and perceived behavioral control, and is used in combination with structural equation modeling to determine what drives intentions. Multiple indicators and multiple causes (MIMIC) models were then used to determine the effects of beliefs on their underlying constructs. The objective of the study was to provide direct and indirect measures of the constructs using survey data to determine importance of and associations with intention to use antimicrobials prudently. The structural equation model indicated that perceived behavioral control explained intention. Thus, farmers who feel capable of prudent use expressed positive intentions. Attitude and perception of others also had influence to a lesser extent. MIMIC models showed that the most important attributes of instrumental attitude were increasing profitability, decreasing risk of residues, and increasing herd health. Contributing attributes of affective attitude were job satisfaction, decreasing resistance, and increasing milk production. For perceived norms, the attributes were opinions/approval of family and peers, veterinarians, and milk processors. Finally, for perceived behavioral control, attributes focused on saving money on labor and treatment, ability to fit into the daily routine, and effectiveness with veterinary guidance. In conclusion, the best approach for adoption of practices might be presentation of examples of successful strategies by other producers, particularly in peer groups. In addition, veterinarians should provide the tools and guidance needed to produce economic gain, reduction of risks associated with residues and resistance, and positive experiences when using the tactics.


Assuntos
Anti-Infecciosos/uso terapêutico , Indústria de Laticínios/tendências , Fazendeiros/psicologia , Adulto , Idoso , Animais , Bovinos , Doenças dos Bovinos/tratamento farmacológico , Fazendas/tendências , Feminino , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Intenção , Masculino , Pessoa de Meia-Idade , New York , Inquéritos e Questionários , Médicos Veterinários
13.
J Dairy Sci ; 102(11): 10379-10394, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31447158

RESUMO

Achieving herd health and welfare improvement increasingly relies on cattle veterinarians to train and advise farmers, placing veterinary interactions at the heart of knowledge exchange. Cattle veterinarians recognize their influence and the need to be proactive advisors but struggle with acting upon this awareness in daily practice, reporting a need to enhance their advisory approach to inspire farmer behavior change. Understanding how veterinarian-farmer interactions positively or negatively influence the enactment of change on farm is therefore essential to support the cattle veterinary profession. This paper adopts a qualitative approach to conceptualize how and under what circumstances veterinary advice has the potential to support and inspire farmer engagement with behavior change on the UK dairy farm. Fourteen UK dairy farms were recruited to take part in a qualitative study involving research observation of a typical advisory consultation between veterinarian and farmer (n = 14) followed by separate, in-depth interviews with the farmer(s) and their respective veterinarian. Interview data were organized using a template coding method and analyzed thematically. While accuracy of veterinary advisory content was valued, it was a relational context of trust, shared veterinarian-farmer understanding, and meaningful interpretation of advice at a local (farmer) level that was most likely to enact change. Critically, these relational factors were reported to work together synergistically; a trusting relationship was an essential, but not necessarily sufficient, component to create a culture of change. Findings suggest that cattle veterinarians may benefit from tailoring advisory services to the farmer's specific world view, facilitated by a shared understanding of the farmer's immediate and long-term motivational drivers. In consequence, cattle veterinarians seeking to positively engage farmers in advisory interactions could consider a focus on farmer priorities, motivations, and goals as paramount to frame and inform advisory messages. This explicit collaborative communication encourages the selection of appropriate and timely veterinary expertise, leading to better integration and adoption of advice on farm given enhanced advisory relevance for farmers' unique circumstances. This farmer-centered approach, involving active co-creation of plans between individuals, is critical for engagement and commitment when tackling complex problems.


Assuntos
Consultores , Indústria de Laticínios/métodos , Fazendeiros/psicologia , Médicos Veterinários/psicologia , Bem-Estar do Animal , Animais , Bovinos , Comunicação , Indústria de Laticínios/tendências , Coleta de Dados , Fazendas , Humanos , Entrevistas como Assunto , Motivação , Registros/veterinária , Reino Unido
14.
Trop Anim Health Prod ; 51(5): 1009-1017, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30911961

RESUMO

In the next two decades, the world population will increase significantly; the majority in the developing countries located in the tropics of Africa, Asia, Latin America, and the Caribbean. To feed such a population, it is necessary to increase the availability of food, particularly high-value animal protein foods produced locally, namely meat and dairy products. Dairy production in tropical regions has a lot of growth potential, but also poses a series of problems, particularly as dairy production systems were developed in temperate countries and in most cases are difficult to implement in the tropics. Drawbacks include hot weather and heat stress, the lack of availability of adequate feeds, poor infrastructure, and cold chain and the competition with cheap imports from temperate countries. This position paper reviews the major drawbacks in dairy production for the five major dairy species: cattle, water buffalo, sheep, goat, and camel, as well as the future trends in research and development. It also concerns the major trends in reproduction and production systems and health issues as well as environmental concerns, particularly those related to greenhouse gas emissions. Tropical Animal Health and Production now launches a topical collection on Tropical Dairy Science. We aim to publish interesting and significant papers in tropical dairy science. On behalf of the editorial board of the Tropical Animal Health and Production, we would like to invite all authors working in this field to submit their works on this topic to this topical collection in our journal.


Assuntos
Indústria de Laticínios/métodos , Indústria de Laticínios/tendências , Abastecimento de Alimentos , Temperatura Alta/efeitos adversos , Animais , Búfalos , Camelus , Bovinos , Saúde Ambiental , Cabras , Ovinos
16.
Reprod Fertil Dev ; 32(2): 50-55, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-32188557

RESUMO

The Canadian dairy industry has been using invivo and invitro assisted reproductive technologies to produce embryos. Technological improvements have helped increase the number and quality of embryos produced, but genetic and genomic tools for improving these traits have yet to be assessed for the Canadian Holstein population. Genetic parameters and a genome-wide association study were performed in Canadian Holstein for the total number of embryos (NE) and the number of viable embryos (VE). Results showed potential for genetic selection for both NE and VE, with heritability estimates (± s.e.) of approximately 0.15±0.01. Genetic correlations between the number of embryos produced using different procedures (invivo and invitro) suggested that a similar number of embryos should be expected from a donor regardless of the procedure used. A region on chromosome 11 of the bovine genome was found to be significantly associated with the number of embryos, indicating a potential regulatory role of this region on embryo production. Overall, these findings are of interest for the Canadian dairy industry because they provide useful information for breeders that are interested in producing embryos from the elite donors in their herds or in the population using assisted reproductive technologies.


Assuntos
Cruzamento/métodos , Bovinos/embriologia , Indústria de Laticínios/métodos , Embrião de Mamíferos/citologia , Técnicas Genéticas/veterinária , Técnicas de Reprodução Assistida/veterinária , Animais , Bovinos/genética , Clonagem de Organismos/métodos , Clonagem de Organismos/veterinária , Indústria de Laticínios/tendências , Embrião de Mamíferos/fisiologia , Feminino , Estudo de Associação Genômica Ampla/veterinária , Genômica/métodos , Genômica/tendências , Seleção Genética
17.
J Dairy Sci ; 101(5): 3722-3741, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29501340

RESUMO

The world's population will reach 10.4 billion in 2067, with 81% residing in Africa or Asia. Arable land available for food production will decrease to 0.15 ha per person. Temperature will increase in tropical and temperate zones, especially in the Northern Hemisphere, and this will push growing seasons and dairy farming away from arid areas and into more northern latitudes. Dairy consumption will increase because it provides essential nutrients more efficiently than many other agricultural systems. Dairy farming will become modernized in developing countries and milk production per cow will increase, doubling in countries with advanced dairying systems. Profitability of dairy farms will be the key to their sustainability. Genetic improvements will include emphasis on the coding genome and associated noncoding epigenome of cattle, and on microbiomes of dairy cattle and farmsteads. Farm sizes will increase and there will be greater lateral integration of housing and management of dairy cattle of different ages and production stages. Integrated sensors, robotics, and automation will replace much of the manual labor on farms. Managing the epigenome and microbiome will become part of routine herd management. Innovations in dairy facilities will improve the health of cows and permit expression of natural behaviors. Herds will be viewed as superorganisms, and studies of herds as observational units will lead to improvements in productivity, health, and well-being of dairy cattle, and improve the agroecology and sustainability of dairy farms. Dairy farmers in 2067 will meet the world's needs for essential nutrients by adopting technologies and practices that provide improved cow health and longevity, profitable dairy farms, and sustainable agriculture.


Assuntos
Bovinos/metabolismo , Indústria de Laticínios/métodos , Animais , Ásia , Bovinos/genética , Bovinos/crescimento & desenvolvimento , Indústria de Laticínios/economia , Indústria de Laticínios/tendências , Fazendas/economia , Feminino , Leite/economia , Leite/metabolismo
18.
J Dairy Sci ; 100(12): 10189-10233, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29153162

RESUMO

From 1917 to 2017, dairy grazing systems have evolved from uncontrolled grazing of unimproved pastures by dual-purpose dairy-beef breeds to an intensive system with a high output per unit of land from a fit-for-purpose cow. The end of World War I signaled significant government investments in agricultural research institutes around the world, which coincided with technological breakthroughs in milk harvesting and a recognition that important traits in both plants and animals could be improved upon relatively rapidly through genetic selection. Uptake of milk recording and herd testing increased rapidly through the 1920s, as did the recognition that pastures that were rested in between grazing events yielded more in a year than those continuously grazed. This, and the invention and refinement of the electric fence, led to the development of "controlled" rotational grazing. This, in itself, facilitated greater stocking rates and a 5 to 10% increase in milk output per hectare but, perhaps more importantly, it allowed a more efficient use of nitrogen fertilizer, further increasing milk output/land area by 20%. Farmer inventions led to the development of the herringbone and rotary milking parlors, which, along with the "unshortable" electric fence and technological breakthroughs in sperm dilution rates, allowed further dairy farm expansion. Simple but effective technological breakthroughs in reproduction ensured that cows were identified in estrus early (a key factor in maintaining the seasonality of milk production) and enabled researchers to quantify the anestrus problem in grazing herds. Genetic improvement of pasture species has lagged its bovine counterpart, but recent developments in multi-trait indices as well as investment in genetic technologies should significantly increase potential milk production per hectare. Decades of research on the use of feeds other than pasture (i.e., supplementary feeds) have provided consistent milk production responses when the reduction in pasture intake associated with the provision of supplementary feed (i.e., substitution rate) is accounted for. A unique feature of grazing systems research over the last 70 yr has been the use of multi-year farm systems experimentation. These studies have allowed the evaluation of strategic changes to a component of the system on all the interacting features of the system. This technique has allowed excellent component research to be "systemized" and is an essential part of the development of the intensive grazing production system that exists today. Future challenges include the provision of skilled labor or specifically designed automation to optimize farm management and both environmental sustainability and animal welfare concerns, particularly relating to the concentration of nitrogen in each urine patch and the associated risk of nitrate leaching, as well as concerns regarding exposure of animals to harsh climatic conditions. These combined challenges could affect farmers' "social license" to farm in the future.


Assuntos
Bovinos , Indústria de Laticínios/métodos , Indústria de Laticínios/tendências , Fenômenos Fisiológicos da Nutrição Animal , Animais , Feminino , Lactação , Leite
19.
J Dairy Sci ; 100(12): 10353-10366, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29153169

RESUMO

We have seen remarkable advances in animal productivity in the last 75 years, with annual milk yield per cow increasing over 4-fold and no evidence of nearing a plateau. Because of these gains in productive efficiency, there have been dramatic reductions in resource inputs and the carbon footprint per unit of milk produced. The primary source for the historic gains relates to animal variation in nutrient partitioning. The regulation of nutrient use for productive functions has the overall goal of maintaining the cow's well-being regardless of the physiological or environmental challenges. From a conceptual standpoint, it involves both acute homeostatic controls operating on a minute-by-minute basis and chronic homeorhetic controls operating on a long-term basis to provide orchestrated adaptations that coordinate tissues and body processes. This endocrine regulation is mediated by changes in circulating anabolic and catabolic hormones, hormone membrane receptors and intracellular signaling pathways. The coordination of tissues and physiological systems includes a plethora of hormones, but insulin and somatotropin are 2 key regulators of nutrient trafficking. Herein, we review the advances in our understanding of both conceptual and actual regulation of nutrient partitioning in support of milk synthesis and identify examples of the challenges and future opportunities in dairy science.


Assuntos
Ciências da Nutrição Animal/tendências , Bovinos , Indústria de Laticínios , Lactação , Animais , Indústria de Laticínios/métodos , Indústria de Laticínios/tendências , Feminino , Leite
20.
Int J Food Sci Nutr ; 68(1): 117-120, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-27580817

RESUMO

The Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico is a five-century institution that, besides the unique clinical role in the center of Milan, may rely on benefactor donations such as fields and farming houses not far from the city, for a total of 8500 ha, all managed by the "Sviluppo Ca' Granda' Foundation". Presently, the main products of these fields are represented by rice and cow's milk. During the latest years, farmers and managers have developed a model of sustainable food production, with great attention to the product quality based on compositional analysis and functional nutritional characteristics. This experience represents a new holistic model of food production and consumption, taking great care of both sustainability and health.


Assuntos
Conservação dos Recursos Naturais , Produção Agrícola/métodos , Indústria de Laticínios/métodos , Qualidade dos Alimentos , Nível de Saúde , Modelos Biológicos , Animais , Bovinos , Conservação dos Recursos Naturais/economia , Conservação dos Recursos Naturais/tendências , Produção Agrícola/economia , Produção Agrícola/educação , Produção Agrícola/tendências , Produtos Agrícolas/química , Produtos Agrícolas/crescimento & desenvolvimento , Indústria de Laticínios/economia , Indústria de Laticínios/educação , Indústria de Laticínios/tendências , Fundações , Saúde Global , Índice Glicêmico , Promoção da Saúde , Humanos , Itália , Leite/química , Estudos de Casos Organizacionais , Oryza/química , Oryza/crescimento & desenvolvimento , Avaliação de Programas e Projetos de Saúde , Sementes/química , Sementes/crescimento & desenvolvimento
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...