title: Lysine requirement of White Leghorn pullets from 8 to 21 weeks of age.
abstract: White Leghorn pullets were fed rations in which the protein supplementary to that provided by the grain portion of the ration was derived from soybean meal, meat and bone meal, anchovy fish meal or cottonseed meal from 8 to 21 weeks of age. Protein levels were varied so that each protein supplement was tested in a feeding program in which pullets received 16% protein diets from 8 to 14 weeks and 14% protein from 14 to 21 weeks and in another feeding program in which 14% protein was fed from 8 to 14 weeks and 12% protein from 14 to 21 weeks. Each of the developing rations contained sufficient nutrient to enable pullets to develop and attain high rate of laying performance. The 14% and 12% protein cottonseed meal diets contained only 0.50% and 0.45% lysine respectively. Thus the lysine requirement of White Leghorn pullets from 8 to 14 weeks and from 14 to 21 weeks is not over 0.50% and 0.45% respectively.
mesh_terms: D000367:Age Factors; D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000378:metabolism* / Q000502:physiology; D004044:Dietary Proteins / Q000378:metabolism; D005260:Female; D008239:Lysine / Q000378:metabolism*; D009751:Nutritional Requirements; D010058:Oviposition; D012741:Sexual Maturation
chemical_list: D004044:Dietary Proteins; D008239:Lysine