Lysine and Methionine Requirement of Chicks Fed Practical Diets

Use of Equivalent Levels of Antibiotic and Vitamin B12 Supplements With Cottonseed and Soybean Oil Meals in Chick Diets

“…Further observations indicated that the screw-pressed meal diet supplemented with 6% meat and bone scraps, 6.5% fish meal, and the Aurofac-Bacitracin combination produced growth significantly greater than that promoted by the all-vegetable protein 20% screwpressed cottonseed meal diet containing 12% soybean meal, the Aurofac-Bacitracin combination and 0.187% lysine. These observations support the findings of Milligan et al (1951) whose work indicated that lysine could be omitted from a cottonseed meal diet and satisfactory growth attained, provided an adequate source of animal protein is included. Grau (1950) reported similar results.…”

Supplements for a “Meat-scraps” Type Chick Ration

“…T HE 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.…”

Supplementation with Vitamin B12 and Amino Acids of Chick Diets Containing Soybean or Cottonseed Meal

“…The work of Bird and Mattingly (1945), Clandinin et al (1946), Gerry et al (1948), and Milligan et al (1951) has demonstrated that such diets are deficient in methionine. In the report of Briggs et al (1950), evidence of growth stimulation in normal chicks by vitamin B12 concentrates and crystalline vitamin B 12 was presented.…”

“…Grau (1946) reported that when cottonseed meal was the sole source of protein, such diets were deficient in lysine and methionine. Other workers (Heywang and Bird, 1950;Milligan et al, 1951) demonstrated that diets consisting primarily of corn and cottonseed meal were deficient in lysine. Richardson and Blaylock (1950) reported that similar diets were deficient in lysine and obtained no increase in the growth of chicks with the addition of methionine or tryptophan.…”