%0 Journal Article
%T AN¨¢LISE UNIVARIADA E MULTIVARIADA DE CARACTER¨ªSTICAS REPRODUTIVAS E PRODUTIVAS DE CABRAS LEITEIRAS UTILIZANDO INFER¨ºNCIA BAYESIANA
%A Natanael Pereira da Silva Santos
%A Jos¨¦ Lindenberg Rocha Sarmento
%A Edgard Cavalcanti Pimenta Filho
%A Jos¨¦ Elivalto Guimar£¿es Campelo
%J Nucleus Animalium
%D 2012
%I Funda??o Educacional de Ituverava
%X This research aimed to study environmental and genetic effects on reproductive and productive traits of goats exploited for milk production. (Co)Variance components and genetic trait parameters for age at first calving, calving interval, and milk production in univariate and multivariate analysis, using Bayesian statistics under animal model, were estimated. Genetic analyses were performed with chains of 1,000,000 cycles. The burn-in of the 100,000 baseline values was considered and these ones were taken every 300 cycles to obtain a posteriori distribution with 3,000 samples. The averages obtained for age at first calving, calving interval, and milk production were 581.68 ¡À 79.44; 322.89 ¡À 132.02 days, and 226.99 ¡À 89.72 kg of milk respectively. All the effects included in the model were significant, except the type of birth one for calving interval, and milk production. The univariate analyses showed heritability values around 0.14, 0.05, and 0.10 for age at first calving, calving interval, and milk production respectively. In the same order, in multivariate analysis, the heritabilities were 0.16, 0.06, and 0.11. Repeatability estimates for the calving interval, and milk production traits were 0.10 and 0.20 respectively. The traits analyzes showed to be strongly influenced by the environment. The multivariate analysis led to slightly higher estimates of heritability.Esta pesquisa objetivou estudar efeitos ambientais e gen¨¦ticos sobre caracter¨ªsticas reprodutivas e produtivas de cabras mesti as exploradas para a produ  o leiteira. Foram estimados componentes de (co)variancia e parametros gen¨¦ticos das caracter¨ªsticas idade ao primeiro parto, intervalo de partos e produ  o de leite em an¨¢lises unicaracter¨ªstica e multicaracter¨ªstica, utilizando-se a estat¨ªstica Bayesiana sob modelo animal. As an¨¢lises gen¨¦ticas foram realizadas com cadeias de 1.000.000 de ciclos. Considerou-se o burn-in dos 100.000 valores iniciais sendo tomados valores a cada 300 ciclos, para se obter a distribui  o a posteriori com 3.000 amostras. As m¨¦dias obtidas para idade ao primeiro parto, intervalo de partos e produ  o de leite foram 581,68 79,44; 322,89 132,02 dias e 226,99 89,72 kg de leite, respectivamente. Todos os efeitos fixos inclu¨ªdos no modelo foram significativos, exceto o tipo de nascimento para o intervalo de partos e produ  o de leite. As herdabilidade em an¨¢lise unicaracter¨ªstica foram 0,14; 0,05 e 0,10 para idade ao primeiro parto, intervalo de partos e produ  o de leite, respectivamente. Na mesma ordem, em an¨¢lise multicaracter¨ªstica, as herdabilidades foram de 0,
%K Goats
%K Variance components. Bayesian inference. Genetic parameter.-Caprinos. Componentes de variancia
%K Infer¨ºncia bayesiana. Parametros gen¨¦ticos
%U http://www.nucleus.feituverava.com.br/index.php/animalium/article/view/782/1002