1. Effect of percentage of protein in the diet on growth and feed utilization of male chickens;Hammond;J. Agr. Res.,1938
2. The level of vitamin A in the diet of laying and breeding chickens during hot weather;Heywang;Poultry Sci.,1952
3. Environmental temperature and protein requirements;Mills;Arch. Bioch.,1944
4. National Research Council, Washington 25, D. C., June 1944 (rev. 1950). Recommended nutrient allowances for domestic animals. No. 1, Recommended nutrient allowances for poultry.