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Selection for Postweaning Weight and Residual Feed Intake in Nelore Cattle

Thursday, August 21, 2014
Posters (The Westin Bayshore)
Maria E. Z. Mercadante , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Thaís M. Ceacero , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Marcela Morelli , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Joslaine N. S. G. Cyrillo , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Fábio M. Monteiro , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Renata H. Branco , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Abstract Text: Sire selection differentials, breeding values for postweaning average daily gain (ADG), dry matter intake (DMI), residual feed intake (RFI), feed conversion rate (FCR), and genetic parameters were evaluated in a herd selected for 0.63 generations for postweaning weight (W378) and RFI. Selection pressures were 0.97 and 0.81 phenotypic standard deviation units for W378 and RFI. The heritability for directly selected traits, W378 and RFI, were 0.38 ± 0.03 and 0.27 ± 0.09, and the genetic correlation between them was zero. The heritabilities for ADG, DMI and FCR were 0.26 ± 0.09, 0.34 ± 0.10 and 0.14 ± 0.07. There was a small trend towards increased breeding values for ADG in the absence of changes in the breeding values for DMI, resulting in a reduction in the breeding values for FCR.

Keywords:

beef cattle

feed efficiency

genetic parameters

selection differential

See more of: Posters: Genetics of Trait Complexes - Feed Intake and Efficiency (Group 1)
See more of: Genetics of Trait Complexes: Feed intake and efficiency
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