Ninety-seven Angus and 98 Gelbvieh crossbred bulls were used to evaluate the effects of Ralgro, Synovex-H and Synovex-S implants on the growth, carcass and palatability traits of young bulls. The influence of the growth promoting implants on the feedlot performance of the bulls was dependent on their breed type and their stage growth. Percentage retail yield was the only carcass characteristic that was affected by the implants. The implanted bulls yielded carcasses with more external fat and less desirable yield grades than the controls. Rib eye area was not affected by the implants.
Breed influenced feedlot performance, carcass composition and quality and palatability attributes more than the implants. The large-framed, late maturing Gelbvieh crossbred bulls grew faster and produced carcasses yielding higher percentages of boneless and produced carcasses yielding higher percentages of boneless trimmed retail cuts than the Angus bulls. The quality grades and palatability traits of the Gelbvieh bulls were marginal.
The Angus bull carcasses has very acceptable yield grades (YG-2) and more desirable quality grades and sensory evaluations than the Gelbvieh crossbred bulls. Thus, the use of medium-framed intact males may be more appropriate than the larger framed breeds to produce a more acceptable product for both the packer and the consumer. Packer acceptability needs to be enhanced to make the use of intact males economically feasible for the producer.
Number of Pages
Department of Animal Science, Agricultural Experiment Station, South Dakota State University
Johnson, R. C.; Gee, D. H.; Bruce, L. B.; and Hanson, R., "The Effects of Breed and Implant on Bullock Beef" (1983). South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1983. 5.