Copper as copper sulfate is often used as a growth promoter and crop mold growth preventative in turkey diets. Addition of 120 ppm copper to turkey diets in a previous study caused a slight decrease in body weights at 8 and 16 weeks of age when the diets contained 75, 85 or 100% of the NRG (1977) recommended sulfur-containing amino acid levels. This level of copper was suspected to decrease sulfur amino acid (S-AA) utilization and cause growth depression. Thus, a factorial experiment was designed to determine the effect of three different levels of copper (60, 120 or 240 ppm) on the growth rate of turkeys as affected by three different levels (75, 100 or 125% of NRG) of S-AA.
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Department of Animal Science, Agricultural Experiment Station, South Dakota State University
Samie, A.; Kashani, A. B.; and Carlson, C. W., "Effect Of Copper On The Sulfur Amino Acid Requirements Of Turkeys" (1981). South Dakota Poultry Field Day Proceedings and Research Reports, 1981. 3.