Componentes de variância e valores genéticos para as produções de leite do dia do controle e da lactação na raça holandesa com diferentes modelos estatísticos

Sire X Herd and Sire X Herd-Year Interactions on Genetic Evaluation of Buffaloes

“…(2009) observed an increase in estimates of heritability partially associated with the reduction of permanent environmental variance, which promoted the reduction in total variance and, consequently, increasing the proportional contribution of additive genetic variance. This growing trend is similar to those reported by Melo (2003) and Cobuci et al (2005), for Holstein, using the Wilmink function to model the genetic variance and permanent environment. Decreasing trend was observed, in Brazil, by Costa et al (2005), for Gyr, by Freitas (2003), for Gyr-Holstein, and Dionello et al (2006), for the Jersey breed.…”