ORIGINAL PAPER
Optimum ratio of standardized ileal digestible tryptophan to lysine for piglets
| 1 | 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
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
KEYWORDS
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
Balachandar Jayaraman, John K. Htoo, Charles M. Nyachoti
Animal Science Journal
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