A nonsignificant but consistent depressing effects from additions of combined copper (120 ppm) and zinc bacitracin (50 or 75 g per ton) was observed in a previous study. One of the factors that has been suspected to be affected by copper is utilization of sulfur containing amino acids. Thus, a factorial experiment was conducted to study the effect of copper (120 ppm) and/or zinc bacitracin (25 g per ton) on the level of sulfur amino acids at 85%, 100% and 115% of NRC (1977) requirements. The low protein density series of Guenthner et al. (1978) was used (23, 20, 18, 16, 14 and 12%). Dietary protein level was reduced at 4-week intervals.
Number of Pages
Department of Animal Science, Agricultural Experiment Station, South Dakota State University
Kashani, A. B.; DeCock, T. J.; and Carlson, C. W., "Effect of Copper And/Or Bacitracin On The Sulphur Amino Acid Requirements Of Turkeys" (1980). South Dakota Poultry Field Day Proceedings and Research Reports, 1980. 3.