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Estimates of genetic parameters for visual scores and daily weight gain in Brangus animals

Published online by Cambridge University Press:  05 January 2011

S. A. Queiroz ,
J. A. Oliveira ,
G. Z. Costa  and
L. A. Fries
S. A. Queiroz*
Affiliation:
Departamento de Zootecnia, FCAV, UNESP, Via de acesso Prof. Paulo Castelane, s/n, 14884-900, Jaboticabal, São Paulo, Brazil
J. A. Oliveira
Affiliation:
Departamento de Ciências Exatas, FCAV, UNESP, Jaboticabal, São Paulo, Brazil
G. Z. Costa
Affiliation:
Animal Breeding Consultant, Rua Américo Brasiliense, 870, Ap. 303, 14015-050, Ribeirão Preto, São Paulo, Brazil
L. A. Fries
Affiliation:
GenSys Consultores Associados S/C Ltda, Rua Juca Quito, 800, 14870-260, Jaboticabal, São Paulo, Brazil
*
†E-mail: saquei@fcav.unesp.br
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Abstract

(Co)variance components were estimated for visual scores of conformation (CY), early finishing (PY) and muscling (MY) at 550 days of age (yearling), average daily gain from weaning to yearling (GWY), conformation (CW), early finishing (PW) and muscling (MW) scores at weaning, and average daily gain from birth to weaning (GBW) in animals forming the Brazilian Brangus breed born between 1986 and 2002 from the livestock files of GenSys Consultants Associados S/C Ltda. The data set contained 53 683; 45 136; 52 937; 56 471; 24 531; 21 166; 24 006 and 25 419 records for CW, PW, MW, GBW, CY, PY, MY and GWY, respectively. Data were analyzed by the restricted maximum likelihood method using single- and two-trait animal models. Direct heritability estimates obtained by single-trait analysis were 0.12, 0.14, 0.13 and 0.14 for CY, PY and MY scores and GWY, respectively. A positive association was observed between the same visual scores at weaning and yearling, with correlations ranging from 0.64 to 0.94. Estimated correlations between GBW and weaning and yearling scores ranged from 0.60 to 0.77. The genetic correlation between GBW and GWY was low (0.10), whereas correlations of 0.55, 0.37 and 0.47 were observed between GWY and CY, PY and MY, respectively. Moreover, GWY showed a weak correlation with CW (0.10), PW (−0.08) and MW (−0.03) scores. These results indicate that selection of the traits that was studied would result in a small response. In addition, selection based on average daily gain may have an indirect effect on visual scores as the correlations between GWY and visual scores were generally strong.

Keywords

heritabilitycorrelationsconformationearly finishingmuscling
Type
Full Paper
Information
animal , Volume 5 , Issue 6 , June 2011 , pp. 838 - 843
Copyright
Copyright © The Animal Consortium 2011

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