Aspectos genéticos e fenotípicos de características produtivas, temperamento e repelência em bovinos da raça Nelore / Phenotypic and genetic aspects to productive traits, temperament and resistance in Nelore beef cattle

AUTOR(ES)

Cristiano de Carvalho Balieiro

DATA DE PUBLICAÇÃO

2008

RESUMO

The general aim of this study was evaluated phenotypic and genetic aspects to growth traits, temperament and resistance in Nelore beef cattle. The traits analyzed in this study were birth weight (BW, N=13,374), weaning weight (WW, N=19,835), weight to over year (W18M, N=15,291), weight gain from weaning to over year (WG345, N=12,873), differentiated weight gain from weaning to over year (WG345DIF, N=12,873), temperament (TEMP, N=13,253) e resistance (RES, N=1,859). The pedigree information was composed by 30,233 animals. Variance and (co)variance components, genetic parameters, as well as predict breeding values were estimated using restricted maximum likelihood analyses (REML). Heritability estimates for BW, WW, W18M, WG345, WG345DIF, TEMP and RES were 0.22, 0.34, 0.34, 0.12, 0.12, 0.15 e 0.18, respectively. The genetics correlations verified were 0.50 (WW and BW), 0.96 (WW and W18M), 0.49 (WW and WG345), 0.55 (WW and WG345DIF), 0.41 (WW and TEMP) and 0.20 (WW and RES). All phenotypic trends to the evaluated traits were negatives (P<0.01), except for WW (P>0.05). All genetic trends to the evaluated traits were positives (P<0.01), except for RES (P<0.01) which presented negative trend. The individual, paternal and maternal inbreeding rates showed increasing behavior (P<0.01) along the study period. Were verified significant effects of individual inbreeding coefficients in all evaluated traits, except for TEMP. The paternal inbreeding coefficients affected significantly the W18M, WG345, WG345DIF traits. Even so, the maternal inbreeding coefficients affected significantly the WW, WG345, WG345DIF traits.

ASSUNTO(S)

tendências endogâmicas genetic parameters phenotypic trends bovinos de corte genetic trends inbreeding trends inbreeding rates parâmetros genéticos beef cattle tendências fenotípicas taxas de endogamia tendências genéticas

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