2008
DOI: 10.1590/s0103-84782008000200022
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Parâmetros genéticos para idade ao primeiro parto estimados por diferentes modelos para rebanhos da raça Nelore

Abstract: RESUMO Com objetivo de estimar parâmetros genéticos e estudar a utilização de diferentes efeitos em avaliações genéticas para idade ao primeiro parto (IPP) por diferentes modelos, foram utilizados registros de IPP de animais da raça (SAS, 2003). While considering year and season of calving in the analysis models (M2 and M3), it was produced a bigger R², indicating that those models could explain, in a larger scale, the existing differences between the animals for AFC. The heritabilities estimated were of low … Show more

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Cited by 12 publications
(9 citation statements)
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References 7 publications
(11 reference statements)
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“…Other studies have also reported high variability in heritability estimates for this trait in Nellore cattle, i.e. 0.14, 0.09, 0.11, 0.26, 0.15 (Boligon et al, 2007;Faria et al, 2007;Boligon et al, 2008;Pereira et al, 2001;Laureano et al, 2011;respectively). Our results indicate that age at first calving presents moderate heritability and is recommended as a selection criterion for sexual precocity.…”
Section: Discussionmentioning
confidence: 93%
“…Other studies have also reported high variability in heritability estimates for this trait in Nellore cattle, i.e. 0.14, 0.09, 0.11, 0.26, 0.15 (Boligon et al, 2007;Faria et al, 2007;Boligon et al, 2008;Pereira et al, 2001;Laureano et al, 2011;respectively). Our results indicate that age at first calving presents moderate heritability and is recommended as a selection criterion for sexual precocity.…”
Section: Discussionmentioning
confidence: 93%
“…A média a posteriori das estimativas de herdabilidade da característica IPP foi baixa (0,16±0,03), e a estimativa do intervalo de 95% da maior densidade a posteriori variou de 0,12 a 0,19, o que indica que a utilização dessa característica como critério de seleção deverá promover pequeno progresso genético quanto à precocidade sexual em rebanhos Nelore. Em um estudo dos diferentes modelos, em termos de efeitos fixos, para avaliar a idade ao primeiro parto de fêmeas da raça Nelore, Boligon et al (2008) relataram valores de herdabilidade de 0,14 a 0,15. Esses autores salientaram que os diferentes modelos utilizados causaram pequenas diferenças nas estimativas de parâmetros genéticos dessa característica.…”
Section: Resultsunclassified
“…When studying different models in terms of fixed effects that affect the age at first calving in Nellore females, Boligon et al (2008b) reported that different data set and models cause small changes on genetic parameters for this trait. However, the age that the females are exposed to reproduction can change the genetic variability of the age at first calving, being always greater when the females are exposed to breeding season at an earlier age, around 12-18 months of age (Pereira et al, 2002;Dias et al, 2004).…”
Section: Methodsmentioning
confidence: 99%