Estimativas de parâmetros genéticos para escores de estrutura corporal (frame) em bovinos de corte da raça Nelore / Estimates of genetic parameters for body structure scores (frame) in Nelore beef cattle

AUTOR(ES)

Andréa Roseli Vançan Russo Horimoto

DATA DE PUBLICAÇÃO

2005

RESUMO

This research was carried out to estimate genetic parameters for estimated frame scores for models proposed from the analysis of data of Nelore beef cattle (FRAME_GMA) and for the equations proposed by Beef Improvement Federation (FRAME_BIF), as well, to verify the correlations among frame scores obtained by the two methodologies and among each one of the scores and the independent variables considered in genetic evaluations of Nelore beef cattle. Data of 12,728 animals from Agro-Pecuária CFM Ltda. were analyzed, with ages between 490 and 610 days. The models of better adjustment for FRAME_GMA included hip height at 18 months, weight at 18 months and interaction height and weight. Estimates of heritability for FRAME_GMA and FRAME_BIF in single trait analysis were: 0.26 ± 0.03 and 0.23 ± 0.03, respectively; and, in mult trait analysis, these estimates were 0.28 and 0.24, respectively. The coefficients of phenotypic and genetic Pearson and Spearman correlations between FRAME_GMA and FRAME_BIF for males and females were positive and high magnitude, varying from 0.83 to 0.92. The coefficients of phenotypic and genetic correlation between each one of the frame scores and the independent variables hip height, weight and age at height measurement always went higher to FRAME_GMA than FRAME_BIF. The genetic parameters and the correlation coefficients indicate that FRAME_GMA was better than FRAME_BIF. Other studies were necessary to evaluate the applicability of the proposed model to other populations and in other age groups, as well, estimates of genetic parameters for frame scores in Nelore beef cattle

ASSUNTO(S)

estrutura corporal nelore genetic parameters melhoramento genético nelore parâmetros genéticos body structure escores de frame genetic improvemet frame scores

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