Utilização de dados parciais na seleção de codornas de corte para produção de ovos

Abstract

Resumo -O objetivo deste trabalho foi verificar a possibilidade de uso de dados parciais na seleção de codornas de corte para produção de ovos. Foram avaliados os grupos genéticos de codornas de corte UFV1 e UFV2, de origens distintas. Using partial data in the selection of meat-type quail for egg productionAbstract -The objective of this work was to verify the possibility of using partial data in the selection of meat-type quail for egg production. The genetic groups UFV1 and UFV2 of meat-type quails, which are from different origins were evaluated. Information from 1,632 mothers, of which 816 from UFV1 and 816 from UFV2 genetic group, was used. The genetic parameters were obtained at the partial periods from the 6 th to 24 th (P 24 ), 32 th (P 32 ), 40 th (P 40 ) and 48 th (P 48 ) weeks, and at the total period of egg production (P 52 ), from the 6 th to 52 th week. The components of variance and covariance and the genetic parameters were estimated by restricted maximum likelihood, using a univariate animal model. The partial and total production of eggs were estimated by the multivariate animal model through the Wombat application. For UFV1, the heritability values were: 0.09, P 24 ; 0.09, P 32 ; 0.09, P 40 ; 0.08, P 48 ; and 0.07 for P 52 ; and the genetic correlations ranged from 0.79 to 0.99. For UFV2, the heritability values were: 0.09 for P 24 ; 0.09, P 32 ; 0.10, P 40 ; 0.11, P 48 ; and 0.13 for P 52 ; and correlations ranged from 0.70 to 0.99. For UFV1 selection, it is recommended to consider egg production up to 40 weeks, and for UFV2 selection, egg production until the 48 th week. The low heritability estimates suggest that management changes should be done in order to control environmental effects.

Avaliação genética para a postura de codornas por meio de modelos de regressão aleatória

“…Relataram também na pesquisa, valores moderadamente baixos de herdabilidade, entre 10 e 17%. Teixeira et al (2013), avaliaram parâmetros genéticos considerando a produção parcial de ovos, colhidos da 6ª à 52ª semana de idade, em codornas de duas linhagens de corte e, com o uso do modelo multicaracterístico nos períodos de produção parcial e total, observaram valores de herdabilidade variando de 7 a 13%.…”