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Growth Curves Changes in Nellore Males Selected for Postweaning Weight

Friday, August 22, 2014
Posters (The Westin Bayshore)
Sarah F.M. Bonilha , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Carolina C. Coutinho , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
Maria E. Z. Mercadante , Centro APTA Bovinos de Corte, Instituto de Zootecnia, Sertãozinho-SP, Brazil
André M. Jorge , Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista, Botucatu-SP, Brazil
Lenira El Faro , SAA/APTA/Instituto de Zootecnia-Centro de Bovinos de Corte, Sertãozinho-SP, Brazil
Cláudia C. P. Paz , SAA/APTA/Instituto de Zootecnia-Centro de Bovinos de Corte, Sertãozinho-SP, Brazil
Joslaine N. S. G. Cyrillo , 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: Data from 1256 Nellore males were analyzed to evaluate the changes caused by selection for postweaning weight in growth curves of body weight, hip height, ultrasound rib eye area and ultrasound rump fat thickness. Animals were born from 1996 to 2011 and records were collected from 8 to 20 month of age. Models that best described growth curves were Brody for body weight, hip height and ultrasound rib eye area, and Logistic for ultrasound rump fat thickness. Herd effect on curves parameters was significant, being the curves estimated for each herd and compared in pairs. The models fitted to the data set showed a good adjustment, with coefficient of determination greater than 85%. Selection for postweaning weight was effective in altering growth curves, resulting in animals with greater growth potential.

Keywords:

beef cattle

muscle

fat

selection

See more of: Posters: Genetics of Trait Complexes: Growth and Development (Group 1)
See more of: Genetics of Trait Complexes: Growth and development
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