Efeito de grupamentos genéticos no peso ao nascimento e ganho de peso de terneiros de corte

Abstract

This work is based on the study of effects of genetic beef cattle breeding groups, where bos indicus bulls were crossing with bos taurus bulls, compared with animals of bos taurus pedigrees mated among each other. Animals of the same quality were used, under the same environmental conditions and treatment, with the objective to compare the development of calves from birth to 50 days of life. As parameters to measure this development was calculated, besides the weights at birth and 50 days: the weight gain in period and the average daily gain and the body condition score of the cows. The files were analyzed using the software program SAS (2001), through the PROC ANOVA procedure, to determine the significance of the effects of genetic groups on the analyzed characteristics. The genetic origin of the animals showed taurino outnumberede the bos indicus, in birth weight, weight at fifty days, weight gain during the period, and average daily gai, and these factors can be explained in relation to the environment that these animals found. There were no significant statistically difference, however the numerical differences are considerable when it refers to a production system with a large number of animals, which suggests that a new research must be done with a larger number of animals. This study allowed the development evaluation of different genetic groups in terms of extensive breeding of beef cattle.