Genetic trends for maternal and direct genetic effects on reproductive traits of swine

Revista Brasileira de Zootecnia

Torres, Robledo de Almeida²  Pires, Aldrin Vieira²  Silva, Martinho de Almeida e¹  Lopes, Paulo Sávio²  Euclydes, Ricardo Frederico²  Costa, André Ribeiro Corrêa da² 

[1] UENF, Campos;UFV, Viçosa

关键词: BLUP;    genetic trends;    reproductive traits;    swine    IntroduçãoCom a finalidade de se obter um produto de qualidade;    em grande quantidade;    e com mínimo custo;    várias inovações tecnológicas vêm sendo desenvolvidas na suinocultura;   

DOI  :  10.1590/S1516-35982000000600014

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- Data of Duroc, Landrace and Large White swine were used to estimate genetic trends for maternal and direct genetic effects of litter size (TLN) and litter weight (PLN) born alive, litter size (TLD) and litter weight (PL21) at 21 days and mortality rate (TM). The genetic parameters were estimated by restricted maximum likelihood (REML) method. Estimated genetic direct and maternal trends were obtained by regressing genetic values averages on dam birth year. Estimated genetic direct trends showed no progress or very small progress for litter traits, being these progresses, in some cases, even negatives (-0.0382 to 0.0756 kg in PLN, -0.1119 to 0.1118 kg in PL21, -0.0031 to 0.0509 pigs in TLN, -0.0217 to 0.0084 pigs in TLD and 0.0997 to ¾0.0059% in TM), showing the difficulty to get high genetic gain in reproductive traits. These results showed the importance of considering relationships informations, in order to obtain higher selection gain for these traits. Estimated genetic maternal trends were, in general, negatives, possibly in function of negative genetic correlations among direct and maternal genetic additive effect.

【 授权许可】

CC BY-NC