Growth curve analysis of Guzera and their crossbreds fed under grazing with or without supplementation: 2. Evaluation of growth curve parameters

Revista Brasileira de Zootecnia

Nardon, Romeu Fernandes²  Leme, Paulo Roberto¹  Boin, Celso¹  Tedeschi, Luís Orlindo³ 

[1] USP;Instituto de Zootecnia, Nova Odessa;Cornell University, Ithaca

关键词: beef cattle;    nonlinear function;    mature weight;    maturing rate     IntroduçãoTêm sido questionado vários efeitos da suplementação no crescimento de bovinos;    principalmente no período de menor disponibilidade de forragens;    com relação ao crescimento;    à composição corporal e aos aspectos econômicos (EUCLIDES FILHO et al;   

DOI  :  10.1590/S1516-35982000000500040

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- This paper evaluated the parameters of Gompertz nonlinear function to describe Guzera male and female growth curve, and their crossbreds (3/4Guzera - 1/4Brown Swiss, 1/2Nellore - 1/4Brown Swiss - 1/4Guzera, 1/2Brown Swiss - 1/2Guzera, 1/2Chianina - 1/4Brown Swiss - 1/4Guzera, 1/2Caracu - 1/2Guzera, 1/2Caracu - 1/4Brown Swiss - 1/4Guzera) submitted to three levels of supplementation: without supplementation, supplementation only during the dry season, and year-round supplementation. There were significant interactions between supplementation and breed, and breed and sex on mature weight and maturing rate; supplementation and sex on maturing rate and integration parameter; and breed effect on integration parameter. The dry season supplementation did not change mature weight. Increasing the energy content of the supplement increased the maturing rate estimates. Supplementation during year-round decreased the estimates of mature weight but increased maturing rate values. Calving status had a significant effect on mature weight and maturing rate estimates. An allometric equation with an r2 of 0.68 was derived to predict maturing rate from mature weight estimates.

【 授权许可】

CC BY-NC