Abstract
Evaluation of High Standardized Ileal Digestible Tryptophan:Lysine Ratios with Ractopamine HCl on Growth and Carcass Performance of Pigs from 240 to 295 lb
Highlights
Tryptophan (Trp) is generally considered the second or third limiting amino acid in corn-soybean meal-based diets fed to growing and finishing swine.[4]
A total of 935 pigs (PIC 1050 × 337, initially 237.2 lb BW) were used in a 22-d trial to determine the effects of feeding high levels of standardized ileal digestible (SID) Trp:Lys ratio in diets with ractopamine HCl (RAC, Paylean, Elanco Animal Health, Greenfield, IN) on growth and carcass performance of finishing pigs
All diets were formulated to 0.90% SID Lys and contained 10 ppm ractopamine
Summary
A total of 935 pigs (PIC 1050 × 337, initially 237.2 lb BW) were used in a 22-d trial to determine the effects of feeding high levels of standardized ileal digestible (SID) Trp:Lys ratio in diets with ractopamine HCl (RAC, Paylean, Elanco Animal Health, Greenfield, IN) on growth and carcass performance of finishing pigs. For overall growth performance, increasing SID Trp:Lys increased (linear, P < 0.05) ADFI and SID Trp g/kg gain. There was no evidence for treatment differences for ADG or F/G. There was no evidence for treatment differences for HCW, carcass yield, backfat loin depth, lean, carcass ADG, or carcass feed efficiency. Increasing SID Trp:Lys increased ADFI and SID Trp g/kg gain, there was no evidence for treatment differences for other growth or carcass parameters measured
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