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

[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.

[学科分类] 兽医学

[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