title: A step-down protein program for commercial pullets.
abstract: Three experiments were conducted to evaluate the protein requirement of commercial egg production pullets from 8 to 20 weeks of age. Hyline W-36 pullets were used in Experiments 1 and 3, and Hisex White pullets were used in Experiment 2. They were fed a 20% protein diet for the first 8 weeks. In Experiment 1, a diet containing 14% protein did not result in body weight at 16 weeks equal to that obtained from feeding a diet containing 17% protein. In Experiments 2 and 3, body weights of pullets fed a diet containing 17% protein from 8 to 10 weeks followed by 1% protein reduction biweekly thereafter (12% from 18 to 20 weeks) was equal to that obtained by feeding 18% for the entire period. Performance in the laying house for four 28-day periods was equal for the two treatment groups. Feeding diets with suboptimal protein from 8 to either 12 or 14 weeks of age resulted in reduced body weight. However, when 14% protein was fed for the remainder of the growing period, body weight was restored.
mesh_terms: D000367:Age Factors; D000821:Animal Feed / Q000191:economics; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000502:physiology*; D004044:Dietary Proteins / Q000008:administration & dosage*; D004531:Eggs; D005260:Female; D005527:Food, Fortified; D008239:Lysine / Q000008:administration & dosage; D008715:Methionine / Q000008:administration & dosage; D009751:Nutritional Requirements; D010058:Oviposition; D013237:Stereoisomerism
chemical_list: D004044:Dietary Proteins; D008715:Methionine; D008239:Lysine