ORIGINAL PAPER
Optimum ratio of standardized ileal digestible tryptophan to lysine for piglets
 
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Department of Animal Science, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
CORRESPONDING AUTHOR
C. M. Nyachoti   

Department of Animal Science, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2
Publication date: 2013-10-28
 
J. Anim. Feed Sci. 2013;22(4):323–328
 
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ABSTRACT
Two experiments were conducted to determine optimal standardized ileal digestible (SID) tryptophan:lysine ratio for piglets using growth performance and plasma urea N as response criteria. In Experiment 1, piglets were fed 6 diets with 8.5, 9.5, 10.5, 11.5, 12.5 or 13.5 g · kg–1 SID lysine to estimate lysine requirement. In Experiment 2, piglets were fed 6 diets with 9.2 g · kg–1 SID lysine, and 0.178, 0.182, 0.196, 0.216, 0.227 or 0.236 SID trytophan:lysine to estimate optimal tryptophan:lysine ratio. The SID lysine requirement was estimated to be 10.2 g · kg–1. Response criteria measured were unaffected by SID tryptophan:lysine ratio, implying that the diets fed were not deficient in tryptophan. In conclusion, the SID lysine requirement for the piglets was close to the recommendation by NRC (1998; 10.1 g · kg–1), but not NRC (2012; 12.3 g · kg–1). The optimal SID tryptophan:lysine ratio of the piglets was either equal to or less than 0.178.
 
CITATIONS (1):
1.
Effects of different dietary tryptophan : lysine ratios and sanitary conditions on growth performance, plasma urea nitrogen, serum haptoglobin and ileal histomorphology of weaned pigs
Balachandar Jayaraman, John K. Htoo, Charles M. Nyachoti
Animal Science Journal
 
ISSN:1230-1388