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1.
Res Vet Sci ; 124: 334-337, 2019 Jun.
Article in English | MEDLINE | ID: mdl-31048181

ABSTRACT

The aims of the current study were to assess the inclusion levels of grape byproduct replacing jiggs hay in lambs diets and to evaluate signs of copper poisoning. Thirty-four Texel and Corriedale crossbred female lambs were used in a randomized block experimental design. The treatments comprised four levels of grape byproduct (0; 100; 200 and 300 g/kg DM) in replacement of jiggs hay. The diets were adjusted to the same ZnCu ratio (6:1) of the basal diet. Grape byproduct consumption at up to 30%, led to similar weight gain in the different treatments (P = .92), which was suitable for growing lambs. Grape byproduct in the diet had linear effect on GGT (P < .001) and AST (P < .0001) enzymes as well as on total bilirubin (P = .05). In addition, the highest grape byproduct addition showed the highest consumption of hay (P < .01). Hay replacement by grape byproduct at up to 300 g/kg in the DM was satisfactory to weight gain and did not negatively affect feed intake and weight gain of growing lambs. Maintaining zinc:copper ratio in sheep diets is not effective in preventing liver damage caused by increased dietary copper concentrations over a period of 70 days.


Subject(s)
Copper/poisoning , Heavy Metal Poisoning/veterinary , Sheep, Domestic/physiology , Vitis/chemistry , Zinc/metabolism , Animal Feed/analysis , Animal Nutritional Physiological Phenomena , Animals , Diet/veterinary , Dietary Supplements/analysis , Female , Heavy Metal Poisoning/prevention & control , Zinc/administration & dosage
2.
Genet Mol Res ; 16(2)2017 May 10.
Article in English | MEDLINE | ID: mdl-28510252

ABSTRACT

Understanding non-additive effects in the expression of quantitative traits is very important in genotype selection, especially in species where the commercial products are clones or hybrids. The use of molecular markers has allowed the study of non-additive genetic effects on a genomic level, in addition to a better understanding of its importance in quantitative traits. Thus, the purpose of this study was to evaluate the behavior of the GBLUP model in different genetic models and relationship matrices and their influence on the estimates of genetic parameters. We used real data of the circumference at breast height in Eucalyptus spp and simulated data from a population of F2. Three commonly reported kinship structures in the literature were adopted. The simulation results showed that the inclusion of epistatic kinship improved prediction estimates of genomic breeding values. However, the non-additive effects were not accurately recovered. The Fisher information matrix for real dataset showed high collinearity in estimates of additive, dominant, and epistatic variance, causing no gain in the prediction of the unobserved data and convergence problems. Estimates presented differences of genetic parameters and correlations considering the different kinship structures. Our results show that the inclusion of non-additive effects can improve the predictive ability or even the prediction of additive effects. However, the high distortions observed in the variance estimates when the Hardy-Weinberg equilibrium assumption is violated due to the presence of selection or inbreeding can converge at zero gains in models that consider epistasis in genomic kinship.


Subject(s)
Eucalyptus/genetics , Models, Genetic , Quantitative Trait, Heritable , Epistasis, Genetic , Eucalyptus/growth & development , Genotype
3.
Genet Mol Res ; 15(1)2016 Mar 31.
Article in English | MEDLINE | ID: mdl-27051034

ABSTRACT

The aim of this study was to use multivariate methods and Pearson and partial correlations to disregard phenotypic characteristics that contribute little to differentiation between Brachiaria ruziziensis genotypes. Eighty-one genotypes of B. ruziziensis were assessed in completely randomized blocks with three replications. Ten phenotypic characteristics were assessed: plant height, leaf length, leaf width, sheath length, length of the flower stem, length of the inflorescence axis, number of racemes per inflorescence, length of the basal raceme, number of spikelets per basal raceme, and width of the rachis. The best traits for differentiation between genotypes were determined by assessing relative contribution to diversity, canonical variables, as well as Pearson and partial correlations. Four canonical variables were found to account for 57% of the overall variation, while plant height, sheath length, and number of racemes per inflorescence were considered traits that could potentially be disregarded in future assessments.


Subject(s)
Brachiaria/genetics , Genetic Variation , Genotype , Phenotype , Brachiaria/growth & development , Plant Breeding , Quantitative Trait, Heritable
4.
Arq. bras. med. vet. zootec. (Online) ; 68(2): 489-496, mar.-abr. 2016. tab
Article in Portuguese | VETINDEX | ID: vti-334197

ABSTRACT

Objetivou-se com este estudo estimar parâmetros genéticos para produções parciais e acumuladas de ovos em uma linha fêmea de frangos de corte comercial. Foram considerados 10 períodos mensais entre 25 e 64 semanas, três períodos parciais de 25 a 32, 33 a 48 e 49 a 64 semanas, e três períodos acumulados de 25 até 30, 40 e 50 semanas de idade. Os componentes de covariância e parâmetros genéticos foram obtidos pelo método da máxima verossimilhança restrita, sob o modelo animal considerando o efeito fixo de incubação e os efeitos aleatórios genético aditivo e residual. As estimativas de herdabilidade variaram de 0,12 a 0,41. Evidenciou-se que os períodos anteriores e posteriores ao maior nível de produção apresentam maior variabilidade genética. As correlações genéticas entre os períodos de produção de ovos estudados variaram de -0,12 a 0,98. De modo geral, o padrão de variação foi semelhante entre as estratégias avaliadas, e todas foram geneticamente associadas com a produção total. Os resultados deste estudo mostraram que a melhoria da produção total é viável por meio de seleção de registros parciais. No entanto, caso se considere a eficiência relativa de seleção, o segundo mês e os períodos a partir da quadragésima semana de produção seriam os mais indicados.(AU)


The aim of this study was to estimate genetic parameters for partial and cumulative egg production in a commercial broiler female line. Ten monthly periods between 25 and 64 weeks, three partial periods of 25 to 32, 33 to 48 and 49 to 64 cumulative weeks and three periods of 25 to 30, 40 and 50 weeks of age and total egg production were considered. The restricted maximum likelihood method under the animal model was used to estimate the covariance components and genetic parameters. The fixed effect of incubation and the additive genetic and residual random effects were considered. The estimated heritability ranged from 0.12 to 0.41. These estimates showed that the anterior and posterior periods of the higher production have greater genetic variability. The genetic correlations between periods of the egg production studied ranged from -0.12 to 0.98. In general, the pattern of variation was similar between the strategies evaluated and all were genetically associated with the total egg production. The results of this study showed that the improvement of the total egg production is feasible by selection of partial records. However, considering the relative efficiency of selection, the second month and the periods from the fortieth week of production would be the most suitable.(AU)


Subject(s)
Animals , Chickens/genetics , Genetic Load , Eggs , Poultry/anatomy & histology , Poultry/genetics , Pedigree , Phenotype , Molecular Sequence Annotation/trends
5.
Arq. bras. med. vet. zootec ; Arq. bras. med. vet. zootec. (Online);68(2): 489-496, mar.-abr. 2016. tab
Article in Portuguese | LILACS | ID: lil-779784

ABSTRACT

Objetivou-se com este estudo estimar parâmetros genéticos para produções parciais e acumuladas de ovos em uma linha fêmea de frangos de corte comercial. Foram considerados 10 períodos mensais entre 25 e 64 semanas, três períodos parciais de 25 a 32, 33 a 48 e 49 a 64 semanas, e três períodos acumulados de 25 até 30, 40 e 50 semanas de idade. Os componentes de covariância e parâmetros genéticos foram obtidos pelo método da máxima verossimilhança restrita, sob o modelo animal considerando o efeito fixo de incubação e os efeitos aleatórios genético aditivo e residual. As estimativas de herdabilidade variaram de 0,12 a 0,41. Evidenciou-se que os períodos anteriores e posteriores ao maior nível de produção apresentam maior variabilidade genética. As correlações genéticas entre os períodos de produção de ovos estudados variaram de -0,12 a 0,98. De modo geral, o padrão de variação foi semelhante entre as estratégias avaliadas, e todas foram geneticamente associadas com a produção total. Os resultados deste estudo mostraram que a melhoria da produção total é viável por meio de seleção de registros parciais. No entanto, caso se considere a eficiência relativa de seleção, o segundo mês e os períodos a partir da quadragésima semana de produção seriam os mais indicados.


The aim of this study was to estimate genetic parameters for partial and cumulative egg production in a commercial broiler female line. Ten monthly periods between 25 and 64 weeks, three partial periods of 25 to 32, 33 to 48 and 49 to 64 cumulative weeks and three periods of 25 to 30, 40 and 50 weeks of age and total egg production were considered. The restricted maximum likelihood method under the animal model was used to estimate the covariance components and genetic parameters. The fixed effect of incubation and the additive genetic and residual random effects were considered. The estimated heritability ranged from 0.12 to 0.41. These estimates showed that the anterior and posterior periods of the higher production have greater genetic variability. The genetic correlations between periods of the egg production studied ranged from -0.12 to 0.98. In general, the pattern of variation was similar between the strategies evaluated and all were genetically associated with the total egg production. The results of this study showed that the improvement of the total egg production is feasible by selection of partial records. However, considering the relative efficiency of selection, the second month and the periods from the fortieth week of production would be the most suitable.


Subject(s)
Animals , Poultry/anatomy & histology , Poultry/genetics , Eggs , Genetic Load , Chickens/genetics , Molecular Sequence Annotation/trends , Pedigree , Phenotype
6.
Arq. bras. med. vet. zootec. (Online) ; 67(1): 274-282, 2015. tab
Article in Portuguese | VETINDEX | ID: vti-624

ABSTRACT

Objetivou-se com este estudo estimar parâmetros genéticos para o número total de leitões nascidos (NTLN), número de leitões nascidos vivos (NLNV) e número de leitões vivos aos cinco dias de idade (NLV5) com modelos de regressão aleatória e averiguar melhor modelagem da variância residual na avaliação das trajetórias genéticas do tamanho da leitegada de fêmeas Landrace e Large White. Os dados utilizados foram provenientes de uma granja de melhoramento genético de suínos e continham 2.388 observações de fêmeas Landrace e 2.325 de Large White. Os modelos de melhor ajuste para o NTLN e NLV5 foram os que consideraram a variância residual homogênea e, para NLNV, o modelo com quatro classes de variâncias residuais foi o mais adequado (BIC). Para Landrace, o efeito materno não foi significativo. O modelo que incluiu o efeito materno e quatro classes de variância residual foi o que apresentou melhor ajuste para NTLN na raça Large White, sendo os modelos sem efeito materno e com variância residual homogênea os mais adequados para NLNV e NLV5. As herdabilidades estimadas variaram de baixas a altas (0,08-0,34, 0,04-0,29 e 0,05-0,21 na raça Landrace e 0,16-0,30, 0,10-0,37 e 0,09-0,32 na Large White, para NTLN, NLNV e NLV5, respectivamente). A alta correlação de posto entre os valores genéticos do NLNV e NLV5 sugere que não há necessidades do controle do NLV5 nesse programa de melhoramento genético. Maiores ganhos podem ser obtidos pela seleção no NLNV de fêmeas primíparas, em função da diminuição do intervalo de gerações.(AU)


This study aimed to estimate genetic parameters for total number of piglets born (NTLN), number of piglets born alive (NLNV) and number of piglets alive at five days of age (NLV5) using random regression models and to evaluate the best way for modelling the residual variance in the description of the genetic trajectories of litter size in Landrace and Large White breeds. The data came from a swine breed improvement program, and a total of 2388 and 2325 litter size records of Landrace and Large White, respectively were used in the analyses. The models considering homogenous residual variance showed the best goodness of fit for NTLN and NLV5 and the model with four classes of residual variances was most appropriate for NLNV (BIC). In the Landrace breed the maternal effect was not significant. The model including maternal effect and four classes of residual variance adequately described NTLN of Large White breed and the models without maternal effect and with homogeneous residual variance were most appropriate to describe NLNV and NLV5. The estimated heritability for NTLN, NLNV and NLV5 ranged from low to high (0.08-0.34, 0.04-0.29 and 0.05-0.21 in Landrace breed and 0.16-0.30, 0.10-0.37, 0.09-0.32 in Large White breed.). The magnitude of the rank correlations between breeding values of NLNV and NLV5 suggests that the recording of NLV5 is not necessary in this breed improvement program. High genetic gains can be obtained by selecting NLNV of primiparous females, due to the reduction in the generation interval.(AU)


Subject(s)
Animals , Infant, Newborn , Animals, Newborn/genetics , Swine , Genetic Enhancement
7.
Arq. bras. med. vet. zootec ; Arq. bras. med. vet. zootec. (Online);67(1): 274-282, 2/2015. tab
Article in Portuguese | LILACS | ID: lil-741090

ABSTRACT

Objetivou-se com este estudo estimar parâmetros genéticos para o número total de leitões nascidos (NTLN), número de leitões nascidos vivos (NLNV) e número de leitões vivos aos cinco dias de idade (NLV5) com modelos de regressão aleatória e averiguar melhor modelagem da variância residual na avaliação das trajetórias genéticas do tamanho da leitegada de fêmeas Landrace e Large White. Os dados utilizados foram provenientes de uma granja de melhoramento genético de suínos e continham 2.388 observações de fêmeas Landrace e 2.325 de Large White. Os modelos de melhor ajuste para o NTLN e NLV5 foram os que consideraram a variância residual homogênea e, para NLNV, o modelo com quatro classes de variâncias residuais foi o mais adequado (BIC). Para Landrace, o efeito materno não foi significativo. O modelo que incluiu o efeito materno e quatro classes de variância residual foi o que apresentou melhor ajuste para NTLN na raça Large White, sendo os modelos sem efeito materno e com variância residual homogênea os mais adequados para NLNV e NLV5. As herdabilidades estimadas variaram de baixas a altas (0,08-0,34; 0,04-0,29 e 0,05-0,21 na raça Landrace e 0,16-0,30; 0,10-0,37 e 0,09-0,32 na Large White, para NTLN, NLNV e NLV5, respectivamente). A alta correlação de posto entre os valores genéticos do NLNV e NLV5 sugere que não há necessidades do controle do NLV5 nesse programa de melhoramento genético. Maiores ganhos podem ser obtidos pela seleção no NLNV de fêmeas primíparas, em função da diminuição do intervalo de gerações.


This study aimed to estimate genetic parameters for total number of piglets born (NTLN), number of piglets born alive (NLNV) and number of piglets alive at five days of age (NLV5) using random regression models and to evaluate the best way for modelling the residual variance in the description of the genetic trajectories of litter size in Landrace and Large White breeds. The data came from a swine breed improvement program, and a total of 2388 and 2325 litter size records of Landrace and Large White, respectively were used in the analyses. The models considering homogenous residual variance showed the best goodness of fit for NTLN and NLV5 and the model with four classes of residual variances was most appropriate for NLNV (BIC). In the Landrace breed the maternal effect was not significant. The model including maternal effect and four classes of residual variance adequately described NTLN of Large White breed and the models without maternal effect and with homogeneous residual variance were most appropriate to describe NLNV and NLV5. The estimated heritability for NTLN, NLNV and NLV5 ranged from low to high (0.08-0.34, 0.04-0.29 and 0.05-0.21 in Landrace breed and 0.16-0.30, 0.10-0.37, 0.09-0.32 in Large White breed.). The magnitude of the rank correlations between breeding values of NLNV and NLV5 suggests that the recording of NLV5 is not necessary in this breed improvement program. High genetic gains can be obtained by selecting NLNV of primiparous females, due to the reduction in the generation interval.


Subject(s)
Animals , Infant, Newborn , Animals, Newborn/genetics , Swine , Genetic Enhancement
8.
Br Poult Sci ; 54(6): 780-8, 2013.
Article in English | MEDLINE | ID: mdl-24397514

ABSTRACT

1. This study evaluated the effects of diets with partial and total substitution of soya bean oil (SO) with flaxseed (linseed) oil (FO) on broiler chicken performance, carcass traits, meat chemical composition and blood serum metabolites. 2. A total of 448 one-d-old Cobb 500 broiler chicken were used. They were allotted among 4 treatments with 8 replications, using a completely randomised design, for 35 d. Four diets were compared: T1 = 100% SO (3%, 1-7 d; 4%, 8-21 d; and 5%, 22-35 d); T2 = 50% SO + 50% FO; T3 = 25% SO + 75% FO and T4 = 100% FO. 3. No significant differences were observed in body weight (BW), body weight gain (BWG), feed intake (FI), feed conversion ratio (FCR) and blood serum metabolites (total triglycerides, TRI; total cholesterol, CHO; high-density lipoprotein, HDL; low-density lipoprotein, LDL; glucose, GLU; albumin, ALB; globulin, GLO; and total proteins, TPs). Significant effects were observed for TRI, CHO, HDL, GLU, HDL, LDL, ALB and GLO with regard to the day of collection. 4. Carcass traits did not show significant differences for the treatments. No significant differences were observed for breast and drumstick chemical compositions, with the exception of drumstick fat concentration (quadratic effect). 5. In conclusion, the partial or total substitution of SO with FO did not affect growth performance, carcass traits, meat chemical composition or blood serum profile in broiler chicken. Therefore, FO can be an alternative to SO in the diet formulation for broiler chicken.


Subject(s)
Chickens/physiology , Linseed Oil/pharmacology , Meat/analysis , Weight Gain/drug effects , Animal Feed/analysis , Animals , Blood Chemical Analysis/veterinary , Chickens/growth & development , Diet/veterinary , Dose-Response Relationship, Drug , Linseed Oil/administration & dosage
9.
Genet Mol Res ; 10(2): 1172-9, 2011 Jun 21.
Article in English | MEDLINE | ID: mdl-21732281

ABSTRACT

We examined the correspondence in performance between trees selected from a family test and their respective clones from a clonal test of Eucalyptus. Full-sib families were obtained from controlled pollination among individuals of Eucalyptus grandis and between E. grandis and E. urophylla. The hybridizations did not follow a factorial scheme. The family tests were carried out at three locations in Eunápolis and Itabela counties, in Bahia, Brazil, in 2003. Four hundred and ninety-seven high-performance trees were selected, by the individual BLUP procedure, in the family tests at two years of age, based on wood volume. The clones from these trees and 14 checks were evaluated in clonal tests carried out in the same region in 2006. The wood volume of the clones was evaluated at two years of age. Trait correlation between the trees selected from the family and clonal tests was low. The estimate of the coincidence between the best trees and the best clones using an average of the different intensities of selection was only 27%. These results demonstrate that the selection of trees in the family test should not be too drastic; otherwise the chance plus clones may be overlooked.


Subject(s)
Eucalyptus/genetics , Species Specificity
10.
Arq. bras. med. vet. zootec ; 63(1): 158-164, fev. 2011. tab, graf
Article in Portuguese | VETINDEX | ID: vti-6115

ABSTRACT

Estimaram-se as herdabilidades para os efeitos genéticos direto e materno e as correlações genéticas entre essas variáveis para os pesos ao desmame (P205), ao ano (P365) e ao sobreano (P550) em um rebanho Nelore do norte de Minas Gerais. O modelo estatístico incluiu os efeitos aditivos direto e materno, os efeitos fixos de grupo de contemporâneos (fazenda, sexo, regime alimentar, estação (seca e água) e ano de nascimento do animal) e o efeito da covariável idade da vaca ao parto (linear e quadrático). Os componentes de variância e os valores genéticos foram estimados utilizando-se o método REML. A tendência genética foi obtida utilizando-se a regressão do valor genético médio anual em relação ao ano de nascimento dos animais. As estimativas de herdabilidade do efeito aditivo direto (H2O) para P205, P365 e P550 foram 0,60, 0,69 e 0,75, respectivamente. Estes coeficientes de H2O são de alta magnitude, indicando que o rebanho apresenta variabilidade genética aditiva relativa e, portanto, espera-se progresso genético considerável utilizando a seleção. Pela análise da tendência genética, verificou-se que houve evolução nos valores genéticos dos animais ao longo dos anos estudados.(AU)


The heritabilities for direct and maternal genetic effects and genetic correlations between these effects were estimated for weight at 205 (P205), 365 (P365), and 550 days (P550) in a Nelore herd in northern Minas Gerais. The statistical model included direct and maternal additive effects, in addition to the fixed effects of contemporary group (farm, gender, diet, season - dry and water -, and year of birth) and the covariate age of cow at calving (linear and quadratic effects). The variance components and genetic values were estimated by REML method. The genetic trend was obtained using the regression of the annual mean genetic value in relation to the year birth. The heritability estimates for the direct additive effect (H2O) for P205, P365, and P550 were equal to 0.60, 0.69, and 0.75, respectively. These coefficients showed high magnitude, indicating that the herd in question presents a great additive genetic variability and therefore it is expected a great progress using genetic selection. By the analysis of genetic trend, it was verified a development in animals genetic values over the years studied.(AU)


Subject(s)
Animals , Cattle/classification , Genetics/instrumentation , Phenotype , Genotype , Body Weight/physiology , Gestational Age
11.
Arq. bras. med. vet. zootec ; Arq. bras. med. vet. zootec. (Online);63(1): 158-164, Feb. 2011. ilus, tab
Article in Portuguese | LILACS | ID: lil-582339

ABSTRACT

Estimaram-se as herdabilidades para os efeitos genéticos direto e materno e as correlações genéticas entre essas variáveis para os pesos ao desmame (P205), ao ano (P365) e ao sobreano (P550) em um rebanho Nelore do norte de Minas Gerais. O modelo estatístico incluiu os efeitos aditivos direto e materno, os efeitos fixos de grupo de contemporâneos (fazenda, sexo, regime alimentar, estação (seca e água) e ano de nascimento do animal) e o efeito da covariável idade da vaca ao parto (linear e quadrático). Os componentes de variância e os valores genéticos foram estimados utilizando-se o método REML. A tendência genética foi obtida utilizando-se a regressão do valor genético médio anual em relação ao ano de nascimento dos animais. As estimativas de herdabilidade do efeito aditivo direto () para P205, P365 e P550 foram 0,60, 0,69 e 0,75, respectivamente. Estes coeficientes de são de alta magnitude, indicando que o rebanho apresenta variabilidade genética aditiva relativa e, portanto, espera-se progresso genético considerável utilizando a seleção. Pela análise da tendência genética, verificou-se que houve evolução nos valores genéticos dos animais ao longo dos anos estudados.


The heritabilities for direct and maternal genetic effects and genetic correlations between these effects were estimated for weight at 205 (P205), 365 (P365), and 550 days (P550) in a Nelore herd in northern Minas Gerais. The statistical model included direct and maternal additive effects, in addition to the fixed effects of contemporary group (farm, gender, diet, season - dry and water -, and year of birth) and the covariate age of cow at calving (linear and quadratic effects). The variance components and genetic values were estimated by REML method. The genetic trend was obtained using the regression of the annual mean genetic value in relation to the year birth. The heritability estimates for the direct additive effect () for P205, P365, and P550 were equal to 0.60, 0.69, and 0.75, respectively. These coefficients showed high magnitude, indicating that the herd in question presents a great additive genetic variability and therefore it is expected a great progress using genetic selection. By the analysis of genetic trend, it was verified a development in animals genetic values over the years studied.


Subject(s)
Animals , Cattle/classification , Genetics/instrumentation , Genotype , Gestational Age , Phenotype , Body Weight/physiology
12.
Ars vet ; 26(3): 170-177, 2010.
Article in Portuguese | VETINDEX | ID: vti-32945

ABSTRACT

Um estudo foi conduzido para avaliar a substituição parcial do milho por farinha de batata doce, com ou sem suplementação enzimática, nas dietas de frangos de corte de 1 a 28 dias de idade. Duzentos frangos de corte de um dia, machos, Cobb foram classificados em cinco grupos de 40 animais, de acordo com seus pesos corporais, e alocados em 40 boxes, o que totalizou cinco blocos de oito boxes homogêneos cada. Oito combinações de quatro níveis de farinha de batata doce (0, 20, 40 e 60%) e dois níveis de complexo enzimático (0 e 200 g/ton) foram distribuídos aleatoriamente aos oito boxes de cada bloco. O complexo enzimático era composto por fitase, protease, xilanase, ß-glucanase, celulase, amilase e pectinase. Semanalmente, foram avaliados consumo de ração, peso corporal, conversão alimentar, índice de eficiência produtiva e uniformidade. Essas variáveis foram submetidas à análise da variação para os testes de significâncias dos efeitos principais e da interação de farinha de batata doce e complexo enzimático, seguido da decomposição da variação entre os níveis do fator farinha de batata doce em componentes polinomiais e do ajustamento das funções de respostas polinomiais. Os resultados indicam que a substituição do milho pela farinha de batata doce, com ou sem a suplementação do complexo enzimático, não demonstrou ser efetiva.

13.
Ars vet ; 26(3): 170-177, 2010. tab
Article in Portuguese | VETINDEX | ID: biblio-1419131

ABSTRACT

Um estudo foi conduzido para avaliar a substituição parcial do milho por farinha de batata doce, com ou sem suplementação enzimática, em dietas para frangos de corte de um a 28 dias de idade. Cento e cinquenta pintos machos, com um dia de idade foram distribuídos em 30 boxes de duas baterias metálicas. O delineamento experimental utilizado foi blocos ao acaso em arranjo fatorial 3 x 2 (0, 20 e 40% de farinha de batata doce e 0 e 200 g/ton de complexo enzimático), com cinco repetições de cinco aves por unidade experimental. O complexo enzimático consistia de fitase, protease, xilanase, B-glucanase, celulase, amilase e pectinase. Semanalmente, foram avaliados consumo de ração, peso corporal, conversão alimentar e índice de eficiência produtiva das aves. As variáveis foram submetidas à análise de variância para o teste de significância dos efeitos principais e da interação entre farinha de batata doce e complexo enzimático, seguido da decomposição dos níveis do fator farinha de batata doce em componentes polinomiais. Os resultados indicaram que a substituição parcial do milho pela farinha de batata doce, com ou sem suplementação enzimática, não foi efetiva para melhora no desempenho produtivo de frangos de corte.


A study was run to evaluate the partial replacement of corn by sweet potato meal, with or without the addition of enzyme, in diets for broilers from one to 28 days of age. 150 day-old male broiler chicks were distributed in 30 pens of metallic batteries. A complete experimental block design in 3 x 2 experimental factorial arrangement was used (0, 20 and 40% of sweet potato meal and 0 and 200 g/ton of enzyme complex) with 5 replicates of 5 birds per united experimental. The enzyme complex consisted of phytase, protease, xilanase, B-glucanase, cellulase, amilase ande pectinase. Feed intake, weight gain, feed conversion and factor of production index were evaluated at the end of each week. The variables were subjected to analyse of variance test for main effects (sweet potato meal and enzyme), followed by splitting into levels of o the factor sweet potato meal into polinomial components. The results indicated that the partial replacement of corn by sweet potato meal, with or without enzyme, has no effective for improvement in the broiler performance.


Subject(s)
Animals , Chickens/growth & development , Ipomoea batatas , Hydrolases/analysis , Dietary Supplements/analysis
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