Cross-population selection signatures in Canchim composite beef cattle.

Analyses of livestock genomes have been used to detect selection signatures, which are genomic regions associated with traits under selection leading to a change in allele frequency. The objective of the present study was to characterize selection signatures in Canchim composite beef cattle using cross-population analyses with the founder Nelore and Charolais breeds. High-density single nucleotide polymorphism genotypes were available on 395 Canchim representing the target population, along with genotypes from 809 Nelore and 897 Charolais animals representing the reference populations. Most of the selection signatures were co-located with genes whose functions agree with the expectations of the breeding programs; these genes have previously been reported to associate with meat quality, as well as reproductive traits. Identified genes were related to immunity, adaptation, morphology, as well as behavior, could give new perspectives for understanding the genetic architecture of Canchim. Some selection signatures identified genes that were recently introduced in Canchim, such as the loci related to the polled trait.

Genetic evaluation for reproductive and productive traits in Brahman cattle.

Our objectives were to estimate genetic parameters for male and female reproductive traits and their genetic correlations with body weight and carcass traits, evaluate the genetic trends over the years, and verify the effect of inbreeding on the phenotypes of Brahman cattle. The traits evaluated were body weights at 120, 210, 365, and 450 days of age (W120, W210, W365, and W450); scrotal circumference at 365 and 450 days of age (SC365 and SC450), age at first calving (AFC), gestation length (GL), stayability (STAY), ribeye area (REA), backfat thickness (BFT), and rump fat thickness (RFT). Direct heritability estimates ranged from 0.10 ± 0.03 (AFC) to 0.43 ± 0.06 (GL). Maternal heritability estimates for body weights, scrotal circumferences, and GL ranged from 0.07 ± 0.02 to 0.15 ± 0.03. The proportion of the maternal permanent environment for W120 and W210 was equal to 0.11 ± 0.02. Genetic correlations varied between -0.60 ± 0.25 (STAY and BFT) to 0.97 ± 0.01 (W365 and W450). Except for AFC, all genetic trends were significant (p < 0.05) and presented favorable annual genetic gains. Unfavorable effects due to the increase of inbreeding coefficients were observed for body weights and AFC, suggesting greater attention be paid to the applied mating systems to control inbreeding. Reproductive traits, such as AFC and STAY, could be assisted indirectly by scrotal circumference selection. The emphasis applied to body weight selection, especially at W210, may assist REA. The BFT and RFT traits presented genetic variability and have responded to selection, although not included in the Brahman selection index.

Assisted Reproductive Technology in Neotropical Deer: A Model Approach to Preserving Genetic Diversity.

One of the most significant challenges in deer is the ability to maintain genetic diversity, avoiding inbreeding and sustaining population health and reproduction. Although our general knowledge of reproductive physiology is improving, it appears that the application of assisted reproductive technology (ART) will more efficiently advance wildlife conservation efforts and preserve genetic diversity. The purpose of this review is to present the most important results obtained with the use of ART in Neotropical deer. Thus, the state-of-the-art for estrus synchronization, semen technology, artificial insemination, and in vivo embryo production will be presented. In vitro embryo production (IVP) is also a biotechnology that is taking initial steps in deer. In this aspect, the approach with the proteomics of ovarian follicular fluid is being used as a tool for a better understanding of oocyte maturation. Finally, cell banks and the use of interspecific somatic cell nuclear transfer (iSCNT) as well as the use of stem cells for gametes differentiation are promising techniques.

Evaluation of imputation accuracy using the combination of two high-density panels in Nelore beef cattle.

This study compared imputation from lower-density commercial and customized panels to high-density panels and a combined panel (Illumina and Affymetrix) in Nelore beef cattle. Additionally, linkage disequilibrium and haplotype block conformation were estimated in individual high-density panels and compared with corresponding values in the combined panel after imputation. Overall, 814 animals were genotyped using BovineHD BeadChip (IllumHD), and 93 of these animals were also genotyped using the Axion Genome-Wide BOS 1 Array Plate (AffyHD). In general, customization considering linkage disequilibrium and minor allele frequency had the highest accuracies. The IllumHD panel had higher values of linkage disequilibrium for short distances between SNPs than AffyHD and the combined panel. The combined panel had an increased number of small haplotype blocks. The use of a combined panel is recommended due to its increased density and number of haplotype blocks, which in turn increase the probability of a marker being close to a quantitative trait locus of interest. Considering common SNPs between IllumHD and AffyHD for the customization of a low-density panel increases the imputation accuracy for IllumHD, AffyHD and the combined panel.

Genomic structure of a crossbred Landrace pig population.

Single nucleotide polymorphism (SNP) markers are used to study population structure and conservation genetics, which permits assessing similarities regarding the linkage disequilibrium and information about the relationship among individuals. To investigate the population genomic structure of 300 females and 25 males from a commercial maternal pig line we analyzed linkage disequilibrium extent, inbreeding coefficients using genomic and conventional pedigree data, and population stratification. The average linkage disequilibrium (r2) was 0.291 ± 0.312 for all adjacent SNPs, distancing less than 100 Kb (kilobase) between markers. The average inbreeding coefficients obtained from runs of homozygosity (ROH) and pedigree analyses were 0.119 and 0.0001, respectively. Low correlation was observed between the inbreeding coefficients possibly as a result of genetic recombination effect accounted for the ROH estimates or caused by pedigree identification errors. A large number of long ROHs might indicate recent inbreeding events in the studied population. A total of 36 homozygous segments were found in more than 30% of the population and these ROH harbor genes associated with reproductive traits. The population stratification analysis indicated that this population was possibly originated from two distinct populations, which is a result from crossings between the eastern and western breeds used in the formation of the line. Our findings provide support to understand the genetic structure of swine populations and may assist breeding companies to avoid a high level of inbreeding coefficients to maintain genetic diversity, showing the effectiveness of using genome-wide SNP information for quantifying inbreeding when the pedigree was incomplete or incorrect.

Study on the introgression of beef breeds in Canchim cattle using single nucleotide polymorphism markers.

The aim of this study was to evaluate the level of introgression of breeds in the Canchim (CA: 62.5% Charolais-37.5% Zebu) and MA genetic group (MA: 65.6% Charolais-34.4% Zebu) cattle using genomic information on Charolais (CH), Nelore (NE), and Indubrasil (IB) breeds. The number of animals used was 395 (CA and MA), 763 (NE), 338 (CH), and 37 (IB). The Bovine50SNP BeadChip from Illumina panel was used to estimate the levels of introgression of breeds considering the Maximum likelihood, Bayesian, and Single Regression method. After genotype quality control, 32,308 SNPs were considered in the analysis. Furthermore, three thresholds to prune out SNPs in linkage disequilibrium higher than 0.10, 0.05, and 0.01 were considered, resulting in 15,286, 7,652, and 1,582 SNPs, respectively. For k = 2, the proportion of taurine and indicine varied from the expected proportion based on pedigree for all methods studied. For k = 3, the Regression method was able to differentiate the animals in three main clusters assigned to each purebred breed, showing more reasonable according to its biological viewpoint. Analyzing the data considering k = 2 seems to be more appropriate for Canchim-MA animals due to its biological interpretation. The usage of 32,308 SNPs in the analyses resulted in similar findings between the estimated and expected breed proportions. Using the Regression approach, a contribution of Indubrasil was observed in Canchim-MA when k = 3 was considered. Genetic parameter estimation could account for this breed composition information as a source of variation in order to improve the accuracy of genetic models. Our findings may help assemble appropriate reference populations for genomic prediction for Canchim-MA in order to improve prediction accuracy. Using the information on the level of introgression in each individual could also be useful in breeding or crossing design to improve individual heterosis in crossbred cattle.

Digestibility and performance of lambs fed diets containing old man saltbush hay / Digestibilidade e desempenho de cordeiros alimentados com dietas contendo feno de erva-sal

The aim of this study was to evaluate feed intake, digestibility, nitrogen balance, water balance, and performance of lambs fed diets containing old man saltbush hay associated with a concentrate. Thirtytwo castrated feedlot Santa Inês lambs at approximately eight months of age, with 22 ± 1.97 kg body weight, were distributed into a completely randomized experimental design. Acid detergent fiber intake increased (P < 0.05), whereas non-fibrous carbohydrates intake decreased (P < 0.01). Inclusion of old man saltbush in the diet reduced (P < 0.01) the digestibility of dry and organic matter, neutral and acid detergent fiber, and non-fibrous carbohydrates. The intakes of digestible dry and organic matter, ether extract, total carbohydrates, and digestible non-fibrous carbohydrates also decreased (P < 0.01). Inclusion of old man saltbush did not influence water consumption from the trough by the sheep, averaging 4327.20 mL/day−1. Body weight at slaughter and daily weight gain decreased linearly (P < 0.05) and feed conversion worsened as old man saltbush hay was added to the diet. Inclusion of old man saltbush at up to 40% replacing the concentrate in feedlot lamb diets does not compromise the performance of these animals.(AU)

Objetivou-se avaliar o consumo, digestibilidade, balanço de nitrogênio, balanço hídrico e o desempenho de cordeiros alimentados com dietas contendo feno de erva-sal associado a concentrado. Utilizou-se 32 cordeiros Santa Inês, castrados, com aproximadamente oito meses de idade, peso corporal de 22 ± 1,97 kg, distribuídos em delineamento experimental inteiramente casualizado. O consumo de fibra em detergente ácido aumentou (P < 0,05), enquanto que o de carboidratos não fibrosos reduziu (P < 0,01). A inclusão do feno de erva-sal na dieta dos animais reduziu (P < 0,01) a digestibilidade da matéria seca e orgânica, extrato etéreo, fibra em detergente neutro e ácido e dos carboidratos não fibrosos. O consumo de matéria seca e orgânica digestível, assim como o de extrato etéreo, carboidratos totais e não fibrosos digestíveis também reduziram (P < 0,01). A inclusão da erva-sal não influenciou o consumo de água de bebida pelos ovinos com média de 4327,20 mL/dia-1. O peso corporal ao abate e ganho de peso diário apresentaram comportamento linear negativo (P < 0,05) e a conversão alimentar piorou com a inclusão do feno de erva-sal. A inclusão de feno de erva-sal em até 40% em substituição ao concentrado na dieta de cordeiros em confinamento não compromete o desempenho animal.(AU)

Digestibility and performance of lambs fed diets containing old man saltbush hay / Digestibilidade e desempenho de cordeiros alimentados com dietas contendo feno de erva-sal

The aim of this study was to evaluate feed intake, digestibility, nitrogen balance, water balance, and performance of lambs fed diets containing old man saltbush hay associated with a concentrate. Thirty-two castrated feedlot Santa Inês lambs at approximately eight months of age, with 22 ± 1.97 kg body weight, were distributed into a completely randomized experimental design. Acid detergent fiber intake increased (P 0.05), whereas non-fibrous carbohydrates intake decreased (P 0.01). Inclusion of old man saltbush in the diet reduced (P 0.01) the digestibility of dry and organic matter, neutral and acid detergent fiber, and non-fibrous carbohydrates. The intakes of digestible dry and organic matter, ether extract, total carbohydrates, and digestible non-fibrous carbohydrates also decreased (P 0.01). Inclusion of old man saltbush did not influence water consumption from the trough by the sheep, averaging 4,327.20 mL/day?1. Body weight at slaughter and daily weight gain decreased linearly (P 0.05) and feed conversion worsened as old man saltbush hay was added to the diet. Inclusion of old man saltbush at up to 40% replacing the concentrate in feedlot lamb diets does not compromise the performance of these animals.

Objetivou-se avaliar o consumo, digestibilidade, balanço de nitrogênio, balanço hídrico e o desempenho de cordeiros alimentados com dietas contendo feno de erva-sal associado a concentrado. Utilizou-se 32 cordeiros Santa Inês, castrados, com aproximadamente oito meses de idade, peso corporal de 22 ± 1,97 kg, distribuídos em delineamento experimental inteiramente casualizado. O consumo de fibra em detergente ácido aumentou (P 0,05), enquanto que o de carboidratos não fibrosos reduziu (P 0,01). A inclusão do feno de erva-sal na dieta dos animais reduziu (P 0,01) a digestibilidade da matéria seca e orgânica, extrato etéreo, fibra em detergente neutro e ácido e dos carboidratos não fibrosos. O consumo de matéria seca e orgânica digestível, assim como o de extrato etéreo, carboidratos totais e não fibrosos digestíveis também reduziram (P 0,01). A inclusão da erva-sal não influenciou o consumo de água de bebida pelos ovinos com média de 4.327,20 mL/dia-1. O peso corporal ao abate e ganho de peso diário apresentaram comportamento linear negativo (P 0,05) e a conversão alimentar piorou com a inclusão do feno de erva-sal. A inclusão de feno de erva-sal em até 40% em substituição ao concentrado na dieta de cordeiros em confinamento não compromete o desempenho animal.

Digestibility and performance of lambs fed diets containing old man saltbush hay / Digestibilidade e desempenho de cordeiros alimentados com dietas contendo feno de erva-sal

The aim of this study was to evaluate feed intake, digestibility, nitrogen balance, water balance, and performance of lambs fed diets containing old man saltbush hay associated with a concentrate. Thirtytwo castrated feedlot Santa Inês lambs at approximately eight months of age, with 22 ± 1.97 kg body weight, were distributed into a completely randomized experimental design. Acid detergent fiber intake increased (P < 0.05), whereas non-fibrous carbohydrates intake decreased (P < 0.01). Inclusion of old man saltbush in the diet reduced (P < 0.01) the digestibility of dry and organic matter, neutral and acid detergent fiber, and non-fibrous carbohydrates. The intakes of digestible dry and organic matter, ether extract, total carbohydrates, and digestible non-fibrous carbohydrates also decreased (P < 0.01). Inclusion of old man saltbush did not influence water consumption from the trough by the sheep, averaging 4327.20 mL/day−1. Body weight at slaughter and daily weight gain decreased linearly (P < 0.05) and feed conversion worsened as old man saltbush hay was added to the diet. Inclusion of old man saltbush at up to 40% replacing the concentrate in feedlot lamb diets does not compromise the performance of these animals.

Objetivou-se avaliar o consumo, digestibilidade, balanço de nitrogênio, balanço hídrico e o desempenho de cordeiros alimentados com dietas contendo feno de erva-sal associado a concentrado. Utilizou-se 32 cordeiros Santa Inês, castrados, com aproximadamente oito meses de idade, peso corporal de 22 ± 1,97 kg, distribuídos em delineamento experimental inteiramente casualizado. O consumo de fibra em detergente ácido aumentou (P < 0,05), enquanto que o de carboidratos não fibrosos reduziu (P < 0,01). A inclusão do feno de erva-sal na dieta dos animais reduziu (P < 0,01) a digestibilidade da matéria seca e orgânica, extrato etéreo, fibra em detergente neutro e ácido e dos carboidratos não fibrosos. O consumo de matéria seca e orgânica digestível, assim como o de extrato etéreo, carboidratos totais e não fibrosos digestíveis também reduziram (P < 0,01). A inclusão da erva-sal não influenciou o consumo de água de bebida pelos ovinos com média de 4327,20 mL/dia-1. O peso corporal ao abate e ganho de peso diário apresentaram comportamento linear negativo (P < 0,05) e a conversão alimentar piorou com a inclusão do feno de erva-sal. A inclusão de feno de erva-sal em até 40% em substituição ao concentrado na dieta de cordeiros em confinamento não compromete o desempenho animal.

Genetic analysis on accumulated productivity and calving intervals in Nelore cattle.

The aim of this study was to estimate genetic parameters for accumulated productivity (ACP), first calving interval (CI1), second calving interval (CI2), and mean calving interval (MCI) in Nelore beef cattle. The ACP trait is a reproduction index and comprises the total number of calves born per dam, weight of weaned calves, and age of the dam at calving. Genetic parameters were estimated by the average information restricted maximum likelihood method in two-trait analyses. The average heritability estimate for ACP was 0.17 (0.03). For CI1, CI2, and MCI, the heritability estimates were 0.02, 0.02, and 0.06, respectively. Genetic correlations between ACP with CI1, CI2, and MCI were -0.16 ± 0.47, -0.29 ± 0.53, and -0.40 ± 0.27, respectively. Despite of the low heritability estimates obtained in our study, reproduction traits should be further studied and their inclusion in the selection criteria must be evaluated in order to improve the performance of females because these traits are of great economic importance in beef cattle. Accumulated productivity could contribute to decrease the mean calving interval in Nelore cattle.

Inclinação e exposição de telhado e diferentes materiais de cobertura em modelos reduzidos de instalação zootécnica no outono e inverno / Roof pitch and exposure and different roofing materials in reduced models of animal production facilities in the fall and winter

The objective was to verify the influence of roof pitch, exposure and roofing material on the internal temperature of reduced models of animal production facilities. For the development of the research, 48 reduced models with dimensions 1.00 × 1.00 × 0.50m were used. The roof was shed-type, and models faced the North or South directions, with 24 models for each side of exposure. Ceramic, galvanized-steel and fibro tiles were used to build the roofs. Pitches varied between 20; 30; 40 and 50% for the ceramic tile and 10; 30; 40 and 50% for the other two. Inside the model, temperature readings were performed at every hour, for 12 months. The results were evaluated in a general linear model in a nested 3 × 4 × 2 factorial arrangement. As the roof pitch increased, the internal temperature within the model dropped, so utilizing sharper pitches (50%) for ceramic and fibro roofs with a larger area facing the South can provide lower temperatures within the animal production facilities. In regions where the cold is more stressful than the heat, having animal production facilities with larger roof exposure to the North may minimize the losses caused by cold stress.

Objetivou-se verificar a influencia da inclinação, exposição e tipo de material de cobertura sobre a temperatura interna de modelos reduzidos de instalação zootécnica, em condições ambientais das coordenadas geográficas “21°14´05 de latitude sul e 48°17´09´´ de longitude oeste. Para o desenvolvimento da pesquisa foram utilizados 48 modelos reduzidos nas dimensões de 1,00 x 1,00 x 0,50 metros. A cobertura foi de uma água, dispostos nas exposições Norte-Sul, sendo 24 modelos para cada face de exposição. Foram utilizadas na cobertura, telha de cerâmica, aço galvanizado e fibrocimento. Os níveis de inclinação foram de 20; 30; 40 e 50% para telha de cerâmica e de 10; 30; 40 e 50% para as demais. No interior dos modelos foram realizadas leituras de temperatura, a cada hora durante 12 meses. Os resultados obtidos foram avaliados num modelo linear geral no esquema fatorial aninhado 3 X 4 X 2. As médias obtidas foram comparadas pelo teste de Tukey a 5% de probabilidade. Com o aumento da inclinação do telhado, a temperatura interna dentro do modelo reduziu, de modo que inclinações mais acentuadas (50%) para coberturas de cerâmica e fibrocimento, com uma maior exposição de cobertura para o sul, pode proporcionar temperaturas mais baixas dentro das instalações zootécnicas. Em regiões onde o frio é mais estressante do que o calor, as instalações com maior exposição de cobertura para o Norte pode minimizar as perdas causadas pelo estresse causado pelo frio.

Inclinação e exposição de telhado e diferentes materiais de cobertura em modelos reduzidos de instalação zootécnica no outono e inverno / Roof pitch and exposure and different roofing materials in reduced models of animal production facilities in the fall and winter

The objective was to verify the influence of roof pitch, exposure and roofing material on the internal temperature of reduced models of animal production facilities. For the development of the research, 48 reduced models with dimensions 1.00 × 1.00 × 0.50m were used. The roof was shed-type, and models faced the North or South directions, with 24 models for each side of exposure. Ceramic, galvanized-steel and fibro tiles were used to build the roofs. Pitches varied between 20; 30; 40 and 50% for the ceramic tile and 10; 30; 40 and 50% for the other two. Inside the model, temperature readings were performed at every hour, for 12 months. The results were evaluated in a general linear model in a nested 3 × 4 × 2 factorial arrangement. As the roof pitch increased, the internal temperature within the model dropped, so utilizing sharper pitches (50%) for ceramic and fibro roofs with a larger area facing the South can provide lower temperatures within the animal production facilities. In regions where the cold is more stressful than the heat, having animal production facilities with larger roof exposure to the North may minimize the losses caused by cold stress.(AU)

Objetivou-se verificar a influencia da inclinação, exposição e tipo de material de cobertura sobre a temperatura interna de modelos reduzidos de instalação zootécnica, em condições ambientais das coordenadas geográficas “21°14´05 de latitude sul e 48°17´09´´ de longitude oeste. Para o desenvolvimento da pesquisa foram utilizados 48 modelos reduzidos nas dimensões de 1,00 x 1,00 x 0,50 metros. A cobertura foi de uma água, dispostos nas exposições Norte-Sul, sendo 24 modelos para cada face de exposição. Foram utilizadas na cobertura, telha de cerâmica, aço galvanizado e fibrocimento. Os níveis de inclinação foram de 20; 30; 40 e 50% para telha de cerâmica e de 10; 30; 40 e 50% para as demais. No interior dos modelos foram realizadas leituras de temperatura, a cada hora durante 12 meses. Os resultados obtidos foram avaliados num modelo linear geral no esquema fatorial aninhado 3 X 4 X 2. As médias obtidas foram comparadas pelo teste de Tukey a 5% de probabilidade. Com o aumento da inclinação do telhado, a temperatura interna dentro do modelo reduziu, de modo que inclinações mais acentuadas (50%) para coberturas de cerâmica e fibrocimento, com uma maior exposição de cobertura para o sul, pode proporcionar temperaturas mais baixas dentro das instalações zootécnicas. Em regiões onde o frio é mais estressante do que o calor, as instalações com maior exposição de cobertura para o Norte pode minimizar as perdas causadas pelo estresse causado pelo frio.(AU)

Genetic parameter estimation for pre- and post-weaning traits in Brahman cattle in Brazil.

Beef cattle producers in Brazil use body weight traits as breeding program selection criteria due to their great economic importance. The objectives of this study were to evaluate different animal models, estimate genetic parameters, and define the most fitting model for Brahman cattle body weight standardized at 120 (BW120), 210 (BW210), 365 (BW365), 450 (BW450), and 550 (BW550) days of age. To estimate genetic parameters, single-, two-, and multi-trait analyses were performed using the animal model. The likelihood ratio test was verified between all models. For BW120 and BW210, additive direct genetic, maternal genetic, maternal permanent environment, and residual effects were considered, while for BW365 and BW450, additive direct genetic, maternal genetic, and residual effects were considered. Finally, for BW550, additive direct genetic and residual effects were considered. Estimates of direct heritability for BW120 were similar in all analyses; however, for the other traits, multi-trait analysis resulted in higher estimates. The maternal heritability and proportion of maternal permanent environmental variance to total variance were minimal in multi-trait analyses. Genetic, environmental, and phenotypic correlations were of high magnitude between all traits. Multi-trait analyses would aid in the parameter estimation for body weight at older ages because they are usually affected by a lower number of animals with phenotypic information due to culling and mortality.

Carcass yields, commercial cuts and non-carcass components of Santa Ines lambs fed with saltbush hay and concentrate / Rendimentos de carcaça, cortes comerciais e não-componentes da carcaça de cordeiros Santa Inês alimentados com feno de erva-sal e concentrado

This work aimed to evaluate the carcass yields, commercial cuts and non-carcass components of Santa Inês lambs fed with 30, 40, 50 or 60% of oldman saltbush hay with concentrated. Were used 32 castrated lambs at 8 months old and initial body weight of 22 + 1.97kg, housed individually and slaughtered after 60 days of feedlot. The weights of hot and cold carcass decreased linearly with the inclusion of saltbush hay in the diet, however, there was no effect for true carcass yield and commercial cuts: shoulder (19.26%), neck (8.52%) ribs (26.57%) and leg (33.88%). There was a linear decrease for ribeye area and fat thickness when the level of hay in the diet increased. The weights and yields of skin, liver, heart, kidneys with perirenal fat, omental and mesenteric fats decreased linearly with the inclusion of hay in the diet, while the content (%) of gastrointestinal tract increased. The increased proportion of saltbush hay in the diet of lambs provided adequate true carcass yield and commercial cuts, however, reduces the ribeye area and fat thickness, important measurements in the qualitative evaluation of the lambs carcass.

Objetivou-se com este trabalho avaliar os rendimentos de carcaça, cortes comerciais e não-componentes da carcaça de cordeiros Santa Inês alimentados com 30, 40, 50 e 60% de feno de erva-sal associado a concentrado. Foram utilizados 32 ovinos machos castrados, com 8 meses de idade e peso inicial de 22 + 1,97kg, confinados individualmente e abatidos após 60 dias de confinamento. Os pesos de carcaça quente e fria decresceram linearmente com o aumento de feno de erva-sal na dieta, no entanto, não houve efeito para o rendimento verdadeiro de carcaça (59,42%) e dos cortes: paleta (19,26%), pescoço (8,52%), costelas (26,57%) e perna (33,88%). Houve efeito linear decrescente para área de olho de lombo e espessura de gordura à medida que o nível de feno de erva-sal aumentou na dieta. Os pesos e os rendimentos de pele, fígado, coração, rins com gordura perirrenal e gorduras omental e mesentérica decresceram linearmente com a inclusão de feno de erva-sal na dieta, enquanto o conteúdo (%) do trato gastrintestinal aumentou. O aumento da proporção de feno de erva-sal na dieta de cordeiros proporciona adequados rendimentos verdadeiros de carcaça e dos cortes comerciais, no entanto, reduz a área de olho de lombo e a espessura de gordura subcutânea, medidas importantes na avaliação qualitativa da carcaça ovina.

Carcass yields, commercial cuts and non-carcass components of Santa Ines lambs fed with saltbush hay and concentrate / Rendimentos de carcaça, cortes comerciais e não-componentes da carcaça de cordeiros Santa Inês alimentados com feno de erva-sal e concentrado

This work aimed to evaluate the carcass yields, commercial cuts and non-carcass components of Santa Inês lambs fed with 30, 40, 50 or 60% of oldman saltbush hay with concentrated. Were used 32 castrated lambs at 8 months old and initial body weight of 22 + 1.97kg, housed individually and slaughtered after 60 days of feedlot. The weights of hot and cold carcass decreased linearly with the inclusion of saltbush hay in the diet, however, there was no effect for true carcass yield and commercial cuts: shoulder (19.26%), neck (8.52%) ribs (26.57%) and leg (33.88%). There was a linear decrease for ribeye area and fat thickness when the level of hay in the diet increased. The weights and yields of skin, liver, heart, kidneys with perirenal fat, omental and mesenteric fats decreased linearly with the inclusion of hay in the diet, while the content (%) of gastrointestinal tract increased. The increased proportion of saltbush hay in the diet of lambs provided adequate true carcass yield and commercial cuts, however, reduces the ribeye area and fat thickness, important measurements in the qualitative evaluation of the lambs carcass.(AU)

Objetivou-se com este trabalho avaliar os rendimentos de carcaça, cortes comerciais e não-componentes da carcaça de cordeiros Santa Inês alimentados com 30, 40, 50 e 60% de feno de erva-sal associado a concentrado. Foram utilizados 32 ovinos machos castrados, com 8 meses de idade e peso inicial de 22 + 1,97kg, confinados individualmente e abatidos após 60 dias de confinamento. Os pesos de carcaça quente e fria decresceram linearmente com o aumento de feno de erva-sal na dieta, no entanto, não houve efeito para o rendimento verdadeiro de carcaça (59,42%) e dos cortes: paleta (19,26%), pescoço (8,52%), costelas (26,57%) e perna (33,88%). Houve efeito linear decrescente para área de olho de lombo e espessura de gordura à medida que o nível de feno de erva-sal aumentou na dieta. Os pesos e os rendimentos de pele, fígado, coração, rins com gordura perirrenal e gorduras omental e mesentérica decresceram linearmente com a inclusão de feno de erva-sal na dieta, enquanto o conteúdo (%) do trato gastrintestinal aumentou. O aumento da proporção de feno de erva-sal na dieta de cordeiros proporciona adequados rendimentos verdadeiros de carcaça e dos cortes comerciais, no entanto, reduz a área de olho de lombo e a espessura de gordura subcutânea, medidas importantes na avaliação qualitativa da carcaça ovina.(AU)