Valores econômicos em sistemas de produção de bovinos de leite utilizados em pequenas propriedades no Rio Grande do Sul.

O objetivo deste estudo foi calcular valores econômicos (VEs) para dois sistemas de produção utilizados em pequenas propriedades rurais no Rio Grande do Sul

Ovelha pantaneira, um grupamento genético naturalizado do Estado do Mato Grosso do Sul, Brasil.

O grupamento genético ovino pantaneiro tem origem no Pantanal, bioma singular que exerce seleção natural intensa nos animais domésticos naturalizados. Devido às condições ambientais reinantes na planície alagada, os ovinos pantaneiros sul-mato-grossenses desenvolveram características adaptativas e produtivas que justificam a sua conservação. Os estudos até o momento concentraram-se nos aspectos morfométricos, para definição de padrões raciais, e no desempenho produtivo (carne, lã, leite, peles, reprodução e sanidade), que resultaram em bons resultados comparados a raças ovinas exóticas. Os estudos de características genéticas, para orientar os programas de seleção e melhoramento, estão em andamento, com o objetivo de complementar os estudos científicos que subsidiam o registro da raça Ovelha Pantaneira

Ovelha pantaneira, um grupamento genético naturalizado do Estado de Mato Grosso do SUL, Brasil.

Resumo: O grupamento genético ovino pantaneiro tem origem no Pantanal, bioma singular que exerce seleção natural intensa nos animais domésticos naturalizados. Devido às condições ambientais reinantes na planície alagada, os ovinos pantaneiros sul-mato-grossenses desenvolveram características adaptativas e produtivas que justificam a sua conservação. Os estudos até o momento concentraram-se nos aspectos morfométricos, para definição de padrões raciais, e no desempenho produtivo (carne, lã, leite, peles, reprodução e sanidade), que resultaram em bons resultados comparados a raças ovinas exóticas. Os estudos de características genéticas, para orientar os programas de seleção e melhoramento, estão em andamento, com o objetivo de complementar os estudos científicos que subsidiam o registro da raça Ovelha Pantaneira. Abstract: Pantaneiro genetic sheep group is originary from Pantanal, a singular biome that exerts intense natural selection in naturalized domesticated animals. Due to environmental conditions prevailing in the flood plain, the sul-mato-grossense sheep developed productive and adaptive traits that justify their conservation. Studies until now have focused on morphometric aspects, to define racial patterns and on performance (meat, wool, milk, skins, playback and animal health) which resulted in good results compared to exotic sheep breeds. Studies of genetic characteristics to guide the selection and breeding programs are underway, with the aim of complementing the scientific studies to subsidize the registry of the Pantaneira Sheep breed

Prediction of weight and percentage of salable meat from Brazilian market lambs by subjective conformation and fatness scores

ABSTRACT This study assessed the use of conformation and fatness scores of the EUROP sheep carcass grading system to predict weight and percentage of salable meat from Brazilian market lambs. Data were collected from in vivo, carcass, and retail production from 252 uncastrated lambs. Evaluated models included single regressions, two multivariate models, and one determined by the stepwise procedure. Conformation was moderately correlated with weight of salable meat. Fatness scores were correlated with rump perimeter, carcass width, and thoracic depth with coefficients of −0.33, −0.32, and −0.23, respectively. Body weight was the best single predictor for weight of salable meat and cold carcass yield for percentage of salable meat. All multivariate models for weight of salable meat prediction were significant. Stepwise regression with body weight, leg perimeter, thoracic depth, rump perimeter, and fatness scores predicted 98% of weight of salable meat variation. For percentage of salable meat prediction, stepwise regression with cold carcass yield, leg perimeter, and conformation score was significant. The EUROP conformation and fatness scores can be used in Brazil for the prediction of lamb meat production

Analysis of polymorphisms in the mitochondrial ND5 gene in Pantaneira and Creole breeds of sheep

The aim of this study was to assess genetic variation between a population of Pantaneira sheep in the Brazilian state of Mato Grosso do Sul, and Creole sheep from the south of the country by molecular analysis of the ND5 gene in mitochondrial DNA. The analysis revealed the presence of 16 haplotypes with all Pantaneira sheep grouped together carrying a single haplotype, and there was no grouping with any of the Creole sheep. The FST value was 0.44, indicating that there is a genetic difference between the two breeds, which may indicate that both breeds underwent differentiation.Key words: Ovis aries, ND5 gene, genetic diversity, phylogeny, breed differentiation

Níveis de proteína na dieta de novilhas da raça pantaneira: Desempenho e digestibilidade aparente

The objective of this experiment was to verify the influence of increasing levels of dietary protein on performance, apparent digestibility and plasma and urinary urea in Pantaneira breed. The data were obtained from 15 heifers, 18 months old and 146 kg initial body weight, fed diets containing 11, 13, 15 and 17 % of crude protein (CP). The animals were confined for 114 days. At intervals of 28 days they were weighed and blood samples and spot samples of feces from the rectum and of urine were taken. The increase in dietary CP content did not influenced dry matter (DM) intake and average daily weight gain (ADG), but improved nutrient digestibility, increased blood nitrogen levels and increased excretion of urinary urea. A mean intake of 5.13 kg DM/animal/day and an ADG of 570 g were observed. Apparent digestibility values of 40.9, 59.6, 39.2, 41.3 and 34,0 % for DM, CP, total carbohydrate, neutral detergent fiber and acid detergent fiber, respectively, were found. Plasma urea concentration was 49.6 mg/dL; and an urinary urea loss of 110,0 g/animal/day was observed.Objetivou-se com este trabalho verificar a influência de níveis crescentes de proteína dieté- tica sobre o desempenho, digestibilidade aparente e concentrações de uréia plasmática e urinária, em bovinos da raça Pantaneira. Os dados foram obtidos de 15 novilhas, com 18 meses de idade e peso corporal inicial de 146 kg, recebendo dietas com 11; 13; 15 e 17 % de proteína bruta (PB). Os animais permaneceram confinados por 114 dias e em intervalos de 28 dias foram pesados e realiza- das coletas de sangue, de fezes na ampola retal e de urina na forma spot. O aumento do teor de PB não influenciou o consumo de matéria seca (MS) e o ganho de peso médio diário (GMD); porém melhorou a digestibilidade dos nutrientes, elevou os níveis de nitrogênio no sangue e promoveu maior excreção de uréia urinária. Observou-se, em média, consumos de 5,13 kg MS/animal/dia; GMD de 570 g; coeficientes de digestibilidade aparente de 40,9; 59,6; 39,2; 41,3 e 34,0 % para MS, PB, carboidrato total (CT), fibra detergente neutro (FDN) e ácido (FDA), respectivamente; concentração de uréia plasmática de 49,6 mg/dL; e perda de uréia urinária de 110,0 g/animal/dia

Genetic parameters for milk yield, age at first calving and interval between first and second calving in milk buffaloes

Genetic parameters for the relation between the traits of milk yield (MY), age at first calving (AFC) and interval between first and second calving (IBFSC) were estimated in milk buffaloes of the Murrah breed. In the study, data of 1578 buffaloes at first lactation, with calvings from 1974 to 2006 were analyzed. The MTDFREML system was used in the analyses with models for the MY, IBFSC traits which included the fixed effects of herd-year-season of calving, linear and quadratic terms of calving age as covariate and the random animal effects and error. The model for AFC consisted of the herd-year-season fixed effects of calving and the random effects of animal and error. Heritability estimates MY, AFC and IBFSC traits were 0.20, 0.07 and 0.14, respectively. Genetic and phenotypic correlations between the traits were: MY and AFC = -0.12 and -0.15, MY and IBFSC = 0.07 and 0.30, AFC and IBFSC = 0.35 and 0.37, respectively. Genetic correlation between MY and AFC traits showed desirable negative association, suggesting that the daughters of the bulls with high breeding value for MY could be physiological maturity to a precocious age. Genetic correlation between MY and IBFSC showed that the selection of the animals that increased milk yield is also those that tend to intervals of bigger calving