Submitted to: American Society of Animal Science Southern Section Meeting
Publication Type: Proceedings
Publication Acceptance Date: 1/1/2005
Publication Date: 2/8/2005
Citation: Phillips, W.A., Wettemann, R.P., Coleman, S.W., Holloway, J.W. 2005. Evaluation of Boran, Tuli, Gelbvieh and Brahman F1 crosses in Oklahoma. In: Southern Cooperative Series Bulletin #405 p.176-181. Interpretive Summary: Genetic adaptation to tropical conditions is an important component of beef cattle breeding systems used in the Southern U.S. Presently, the Brahman breed is the major source of this adaptation, but new tropically adapted beef breeds need to be evaluated. An experiment was conducted to compare calves sired Boran and Tuli bulls to calves sired by Brahman bulls and to observe the productivity of the F1 females resulting from these crosses. Calves sired by Brahman bulls were heavier at birth and at weaning than calves sired by bulls from the other breeds. However, cows sired by Boran bulls weaned more calf as a percentage of their body weight than the other crossbred females used in this study. The Boran breed could be used in a crossbreeding program to create females that are tropically adapted, but more efficient in producing a weaned calf than Brahman crossbred cows.
Technical Abstract: Genetic adaptation to tropical conditions is an important component of cow/calf breeding systems used in the Southern US. The objective of this experiment was to evaluate F1 calves sired by new tropically adapted beef breeds (Boran and Tuli) and compare them to commonly used breeds (Brahman and Gelbvieh) and the productivity of the F1 females resulting from these crosses. Angus and Angus x Hereford cows were bred by artificial insemination to Boran, Tuli, Brahman or Gelbvieh bulls in the spring. Tuli-sired calves were lighter at birth than Boran-, Gelbvieh-, and Brahman-sired calves. Brahman-sired calves were heavier at weaning than Boran-, Tuli-, and Gelbvieh-sired calves. Preweaning average daily gain was also greater for the Brahman-sired calves as compared to the other three sire breeds. Calves from Boran-, Tuli-, and Brahman-sired cows were lighter at birth than calves from Gelbvieh-sired cows. Calves from Brahman- and Boran-sired cows had similar body weights and were heavier at weaning than calves from Tuli- and Gelbvieh-sired cows. Average body weight of cows sired by Brahman bulls was greater than the body weight of cows sired by Boran and Tuli bulls. Boran-sired cows weaned more calf as a percentage of cow body weight than cows sired by Brahman, Tuli and Gelbvieh bulls. Boran-sired cows were moderate in size and produced more calf per unit of body weight than any of the sire breeds evaluated.