title: Digestible sulfur amino acid requirement of starting turkeys.
abstract: Three experiments (a total of 1,020 poults) were conducted to determine the digestible sulfur amino acid (SAA) requirement for female turkey poults during the starter period. Poults were fed a standard corn-soybean meal diet (PC) that met or exceeded NRC recommendations (28% CP, 3,172 kcal MEn/kg) for 1 wk and were then randomly assigned to treatments until 22 d (Experiment 2 and 3) or 23 d (Experiment 1) of age. Dietary treatments included the PC diet and seven or nine titrated levels of methionine added to a basal corn-soybean meal diet, for a total of 0.50 to 1.33% total digestible SAA. The basal diet contained 18.4% intact crude protein. All diets contained 3,171 kcal MEn/kg. The true digestible SAA content of the basal diet without methionine additions was 0.50% based on digestibility assays of the corn and soybeans with cecectomized turkeys. Diets were formulated to contain 1.40% digestible lysine. Other amino acids were maintained at levels in relation to lysine based on previous research with turkeys and the Illinois Ideal Chick Protein. Broken-line analysis suggests that the digestible SAA requirement for female turkeys during the starter period is 0.76% for optimum body weight gain and 0.75% 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: D000603:Amino Acids, Sulfur / Q000032:analysis / Q000378:metabolism* / Q000592:standards; D000704:Analysis of Variance; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet / Q000592:standards / Q000662:veterinary*; D004063:Digestion / Q000502:physiology; D005260:Female; D008239:Lysine / Q000032:analysis / Q000378:metabolism / Q000592:standards; D008715:Methionine / Q000032:analysis / Q000378:metabolism / Q000592:standards; D009751:Nutritional Requirements; D011897:Random Allocation; D013025:Glycine max / Q000737:chemistry / Q000592:standards; D014422:Turkeys / Q000254:growth & development* / Q000378:metabolism* / Q000502:physiology; D015430:Weight Gain / Q000502:physiology; D003313:Zea mays / Q000737:chemistry / Q000592:standards
chemical_list: D000603:Amino Acids, Sulfur; D008715:Methionine; D008239:Lysine