Supplements for a “Meat-scraps” Type Chick Ration

THE l-lysine requirement of chicks has been reported by Almquist and Mecchi (1942); Grau, Kratzer and Asmundson (1946); and Milligan, Machlin, Bird and Heywang (1951) to be approximately 0.9 percent of the total ration. Grau (1948) reported that the l-lysine requirement of chicks increases with increased protein intake. Aureomycin did not exert a sparing action on lysine under the experimental conditions used by Jones and Combs (1951). Machlin, Denton and Bird (1952) observed that a combination of aureomycin and lysine produced better growth when fed as supplements to a ration containing cottonseed meal than when either was fed separately. Slinger, Bergey, Pepper and Arthur (1951) reported that neither aureomycin nor penicillin affected the protein requirements of broilers; however, Machlin, Denton, Kellog and Bird (1952) observed that under their experimental conditions aureomycin did decrease the protein requirement for early chick growth and increased feed efficiency. In the present investigation, the antibiotics: …