title: Digestible lysine requirement of female turkeys during the starter period.
abstract: Three experiments were conducted to determine the digestible lysine requirement of female turkey poults during the starter period. Birds were fed a standard corn-soybean meal diet until the onset of each trial and were then randomly assigned to treatments that were fed for 2 wk. Dietary treatments included titrated levels of digestible lysine (1.18 to 1.72%) added to a basal corn-soybean meal diet with an intact crude protein content of either 21% (Experiment 1) or 18.4% (Experiments 2 and 3). All diets contained 3,100 to 3,200 kcal MEn/kg. True digestible lysine contents of the basal diets were 1.42% (Experiment 1) and 1.18% (Experiments 2 and 3), based on digestibility assays of corn and soybean meal with cecectomized turkeys. A positive control diet (28% CP, 3,175 kcal MEn/kg) was also included in the treatments for comparison. Other amino acids were maintained at levels in relation to lysine based on previous research and the Illinois Ideal Chick Protein. Broken-line analysis suggests that the digestible lysine requirement is 1.32% for optimum body weight gain and 1.34% for optimal feed:gain at the energy levels used in these studies.
authors.affiliation: Department of Animal Science, University of Missouri-Columbia, 65211, USA.
authors.forename: S D
authors.initials: SD
authors.lastname: Boling
authors.forename: J D
authors.initials: JD
authors.lastname: Firman
mesh_terms: D000821:Animal Feed / Q000032:analysis / Q000592:standards; D000818:Animals; D015331:Cohort Studies; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D004063:Digestion; D004435:Eating / Q000502:physiology*; D005260:Female; D008239:Lysine / Q000008:administration & dosage* / Q000378:metabolism; D009751:Nutritional Requirements; D013025:Glycine max / Q000737:chemistry; D014422:Turkeys / Q000502:physiology*; D015430:Weight Gain / Q000502:physiology*; D003313:Zea mays / Q000737:chemistry
chemical_list: D008239:Lysine