Effect of Lysine, Tryptophan and(or) Carbadox Additions to Low Protein Corn-Soybean Meal Diets for Young Pigs

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Abstract
Addition of L-lysine (Lys), L-tryptophan (Trp) and(or) 55 ppm carbadox (C) to low protein corn-soybean meal diets was evaluated in two experiments using 444 crossbred pigs. In Exp. 1, initial and final weights of pigs were 17.7 and 33.3 kg, respectively, for the 28 d experiment. Pigs fed the 13% protein diet containing added Lys (.17%) or Lys + C had average daily gains (ADG) similar to those fed the 16% protein diet (positive control group) and greater (P<.05) than those of pigs fed the 13% protein diet (negative controls). Pigs fed the 13% protein diets containing C had average daily feed intakes (ADFI) and ADG similar to those of pigs fed the 13% protein diet + Lys. Main effect comparisons among the 13% protein groups indicated that C increased (P<.05) ADFI and ADG and that Lys increased (P<.01) ADG and G:F ratio. In Exp. 2, the initial pig weight for the 28 d starter period averaged 7.4 kg. A 28 d grower period followed, in which the protein level was lowered 2% across treatments. The high and low dietary protein level sequences consisted of 18 and 15%, respectively, during the starter period followed by 16 and 13%, respectively, during the grower period. Lys and(or) Trp additions were also lowered from .18 and .05% to .15 and .04%, respectively. The overall 56 d performance indicated that pigs fed the low protein dietary sequence supplemented with either Lys or C had ADFI and ADG similar to those of the high protein dietary sequence positive control group and greater (P<.05) than those of the low protein negative control group. The combination of Lys + C further increased (P<.05) the ADG over that of the high protein sequence group. Overall main effect comparisons among the low protein dietary Sequence groups indicated that either added Lys or C increased (P<.01) ADFI and ADG, with added Lys also increasing G:F ratio. However, added Trp did not improve any performance characteristic. These results indicate that C had a Lys sparing effect in low protein corn-soybean meal diets fed to young pigs. Copyright © 1982. American Society of Animal Science . Copyright 1982 by American Society of Animal Science.

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