Submitted to: Journal of Animal Science
Publication Type: Abstract Only
Publication Acceptance Date: August 1, 2002
Publication Date: August 1, 2002
Citation: Coleman, S.W., Phillips, W.A., Riley, D.G., Chase, C.C., Mayeux Jr, H.S. 2002. Stocker and feedlot performance of Angus and Romosinuano steer calves [abstract]. Journal of Animal Science. 80(Suppl. 2):4-5. Technical Abstract: Although genetic adaptation to tropical conditions is an essential component of the cow/calf systems used in the coastal region of the Southern US, the calves generated on these farms will be transported to more temperate regions for growth and finishing. The objective of this experiment was to compare stocker and feedlot performance of steers from a temperate (Angus) or tropical (Romosinuano) breed reared in a tropical environment but grown and finished in a temperate environment. In the fall of 2000 approximately 21d after weaning, Angus (ANGUS, N = 34 ) and Romosinuano ( ROMO, N = 36 ) steers born and reared at Brooksville, FL were transported 2025 km to El Reno, OK. Steers were managed as a single group, placed in a 28-ha dormant warm season grass pasture, and given ad libitum access to grass hay and a mixed diet formulated to support an ADG of 0.8 kg for the winter/spring (Nov. 16 to April 3; 138 d) stocker period. In late spring, steers grazed winter wheat for 65 d (April 3 to June 5) before entering the feedlot phase of the experiment. Within breed, steers were blocked by weight and steers were selected from each BW strata. Three steers of each breed were placed in one of six pens and individual feed intake was monitored over a 108-d finishing period. Angus steers were heavier (P = 0.05) at the beginning of the stocker phase (222 vs 212 kg ) and gained more weight (121 vs 96 kg ; P = 0.001) than ROMO steer during the 203-d stocker period. Although ANGUS steers enter the feedlot heavier (P = 0.002) than ROMO steers (339 vs 305 kg), ADG (ANGUS = 1.46 kg; ROMO = 1.45 kg) and daily feed intake (ANGUS = 9.58 kg; ROMO = 9.35 kg) were not different ( P > 0.5). Although steers from a tropically adapted breed gained less weight during the winter and spring stocker period than steers from a temperate breed, feedlot performance and feed intake was similar.