Many workers have reported on the failure of antibiotic supplementation to improve the performance of hens already in high egg production. On the other hand, reports have appeared which indicated that under similar conditions the antibiotics have favorably affected the performances of laying pullets. The experiments of this study were designed to make it possible to determine effects of supplementation with antibiotics as well as to compare various feeding systems.
South Dakota State University
Carlson, C.W.; Wilcox, R.A.; Kohlmeyer, W.; and Jones, D.G., "Reproductive Performance of Chickens as Influenced by Antibiotics in the Diet" (1955). Agricultural Experiment Station Technical Bulletins (1939-2011). 26.