Dietary arginine and lysine in Large White toms. 1. Increasing arginine:lysine ratios does not improve performance when lysine levels are adequate.
A study was conducted utilizing two strains of male Large White turkeys (BUT Big 6 and Nicholas 700) to determine the effects of increasing Arg:Lys ratios on live performance and carcass composition. Diets were formulated to provide 100, 110, and 120% of NRC (1994) Lys levels, adjusted for dietary energy level, with Arg:Lys ratios of 1.0:1, 1.1:1, 1.2:1, and 1.3:1 in a 3 x 4 factorial arrangement. Eight pens of 15 poults (four pens of each strain) were fed each of the 12 test diets for an 18-wk period. Diets were changed at 3-wk intervals rather than the 4-wk interval suggested by NRC. The results of this study suggest that the Arg and Lys levels suggested by the NRC (1994) are not sufficient when diets are fed on 3-wk intervals, rather than the 4-wk intervals suggested by NRC. This conclusion is in agreement with the studies of Waldroup et al. (1997b). Increasing Arg:Lys ratios improved performance of turkeys only when the diets contained insufficient amounts of Arg in association with low levels of Lys. Increasing Arg:Lys ratios when diets contained sufficient amounts of these two amino acids was without benefit, in contrast to the report of Brake et al. (1994). Turkeys of the BUT Big 6 strain appeared to be more sensitive to marginal deficiencies of Lys and Arg than did turkeys of Nicholas 700 strain.
Waldroup
P W
PW
Poultry Science Department, University of Arkansas, Fayetteville 72701, USA. pwaldro@comp.uark.edu
England
J A
JA
Kidd
M T
MT
Kerr
B J
BJ
D000818:Animals; D001120:Arginine / Q000008:administration & dosage*; D001823:Body Composition; D004032:Diet; D004347:Drug Interactions; D002149:Energy Intake; D008239:Lysine / Q000008:administration & dosage*; D008297:Male; D009751:Nutritional Requirements; D014422:Turkeys / Q000502:physiology*; D015430:Weight Gain
D001120:Arginine; D008239:Lysine