Limiting amino acids in low protein maize-soyabean meal diets fed to broiler chicks from 3 to 7 weeks of age.
1. An experiment with separately housed male and female broiler chicks was carried out during the period of 3 to 7 weeks of age to determine the limiting amino acids (AA) in a low protein maize-soyabean meal diet. Chicks were fed on diets containing 170, 180, 190 and 200 g crude protein (CP)/kg with or without combined additions of L-threonine (Thr), L-tryptophan (Trp) and L-arginine (Arg) to those in the 180, 190 or 200 g CP/kg diets and a 170 g CP/kg diet with or without combined additions of Thr, Trp, Arg, L-isoleucine (Ile), L-leucine (Leu) and L-valine (Val) to those in the 190 g CP/kg diet. The diets were iso-energetic and contained the same concentrations of lysine (Lys) and sulphur-containing amino acids. 2. Decreasing the dietary CP had a significantly negative effect on performance. 3. No significant effects on performance were found when diets with 180 and 190 g CP/kg were supplemented with Thr, Trp and Arg to those in the 200 g CP/kg diet. 4. There were no significant differences in performance between the groups fed on the diets with 170, 180 and 190 g CP/kg when the 170 and 180 g CP/kg diets were supplemented with Thr, Trp and Arg to those in the 190 g CP/kg diet.(ABSTRACT TRUNCATED AT 250 WORDS)
Holsheimer
J P
JP
Spelderholt Institute for Poultry Research and Information Services, Beckbergen, The Netherlands.
Janssen
W M
WM
D000367:Age Factors; D000596:Amino Acids / Q000008:administration & dosage* / Q000378:metabolism; D000821:Animal Feed / Q000592:standards*; D000818:Animals; D002645:Chickens / Q000254:growth & development*; D004044:Dietary Proteins / Q000008:administration & dosage* / Q000378:metabolism; D004435:Eating; D005260:Female; D008297:Male; D012737:Sex Factors; D013025:Glycine max; D015430:Weight Gain; D003313:Zea mays
D000596:Amino Acids; D004044:Dietary Proteins