Genetic Trends for Growth in a Selection Experiment Involving Purebred and Two-Breed Synthetic Beef Breed in a Tropical Environment

Abstract

Data collected between 1968 and 1988 from a selection experiment involving the purebred Gudali and a two-breed synthetic, the Wakwa, at the Animal Production and Research Station of Wakwa in Ngaoundere, Cameroon, were analyzed using mixed model procedures. An assessment of genetic progress indicated positive and significant (p < 0.01) annual mean direct genetic trends for average preweaning daily gain (ADG), birth weight (BWT), weaning weight (WWT), yearling weight (YWT) and eighteen-month weight (EWT) in both breeds. Corresponding annual maternal trends, with the exception of the ADG trend in Gudali and EWT in Wakwa, were significant (p < 0.05) but negative. Differences between corresponding direct responses in Gudali and Wakwa were not significant. It was concluded that improvement through selection of growth traits was possible in both the synthetic and the indigenous breeds in a harsh tropical environment. The genetic antagonism between the direct and maternal genetic effects was of great concern and therefore requires further investigation.

Keywords

• Bovin Goudali
• Bovin Wakwa
• Animal à viande
• Gain génétique
• Cameroun