The objective of this study was to verify which morphometric measures and ratios are more directly associated with the weight and body yields of rounded fish. A total of 225 specimens of rounded fish (59 pacus, 61 tambaquis, 52 tambacus and 53 paquis) with average weight of 972.43 g (±115.52 g) were sampled, stunned, slaughtered, weighed, measured, and processed for morphometric and processing yield analysis. The morphometric measures taken were: standard length (CP); head length (CC); head height (AC); body […]

The objective of the present study was to analyze models with genetic and/or residual heteroskedasticity for genetic evaluation of the weaning weight of Charolais-Zebu crossbred calves. Weaning weight data from 56,965 crossbred calves were analyzed using animal models with different combinations of genetic and residual heteroskedasticity and/or homoskedasticity. The inference on a posteriori distributions of genetic parameters were by the Monte Carlo method via Markov chains. The model with genetic and residual heteroskedasticity was the best fit on the data. […]

Uma população F2 de suínos obtida a partir do intercruzamento da geração F1, proveniente do acasalamento divergente de dois machos da raça naturalizada brasileira Piau com 18 fêmeas comerciais (Landrace × Large White × Piétrain) e genotipada para cinco marcadores tipo microssatélite foi utilizada com o objetivo de mapear locos de características quantitativas associados a características de desempenho no cromossomo 4. As características avaliadas foram: número de tetas, peso ao nascimento, peso aos 21, 42, 63, 77 e 105 dias […]

Livestock genomics is aimed at dissecting the genetic control of variation in economically important trait, such as disease resistance and product yield/quality. Unraveling the genetic control of such complex traits remains very challenging but farm animals are now well placed to bridge the gap between human biology and traditional model species. Livestock species share with model species the benefits of controlled breeding, while their biology is often much closer to that of humans. Livestock genetics can exploit the abundant genetic […]

Com o objetivo de mapear locos de características quantitativas (QTLs) associados às características de carcaça e de órgão internos, uma população composta de 550 animais F2 foi produzida a partir do intercruzamento da geração F1, obtida pelo cruzamento divergente de dois machos da raça nativa brasileira Piau com 18 fêmeas comerciais. Os animais foram genotipados para 13 marcadores microssatélites distribuídos no cromossomo 6. As características avaliadas foram: comprimento de carcaça pelos métodos brasileiro e americano, peso e rendimento de carcaça, […]