Artigo
Efeitos ambientais e genéticos sobre escores visuais e ganho em peso ao sobreano de bovinos brangus
Fecha
2013-03-28Registro en:
Archivos de Zootecnia, v. 62, n. 237, 2013.
0004-0592
1885-4494
10.4321/S0004-05922013000100012
S0004-05922013000100012
2-s2.0-84875335984
S0004-05922013000100012.pdf
9096087557977610
Autor
Universidade Estadual Paulista (Unesp)
GenSys Consultores Associados S/C Ltda
Resumen
This research aimed at studying the effects of age of the cow at calving (IVP), age of the animal at yearling (IDS), the direct additive genetic (AD) and maternal (AM) effects and individual heterozygosity (HI) on visual scores of conformation (CS), early finishing (PS) and muscling (MS) at postweaning and average daily gain from weaning to yearling (GDS) of cattle used to originate the Brangus breed. There were analyzed records on 24 531, 21 166, 24 006 and 25 419 for CS, PS, MS and GDS, respectively, of animals born from 1986 to 2002 belonging to livestock files of Gensys Consultores Associados S/C Ltda. The analyses were performed by the least square method using mathematical models that included contemporary group as class variable and IVP, IDS, AD, AM and HI as covariates. IVP showed linear and quadratic effects (p<0.01) on GDS and linear (p<0.01) on PS, while the quadratic effect of IDS was not significant for PS and GDS. AD and AM were significant (p<0.01) only for PS and MS scores, respectively. All the traits were significantly (p<0.01) influenced by HI. The environmental and genetic effects were important sources of variation for the studied traits and should be taken into account when comparison of animals and selection were performed.