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Journal of Animal Science, Vol 73, Issue 6 1746-1753, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Sorghum amino acid-supplemented diets for the 50- to 100-kilogram pig

T. L. Ward and L. L. Southern
Department of Animal Science, Louisiana State University Agricultural Center, Baton Rouge 70803, USA.

Three experiments were conducted to evaluate lysine (Lys), threonine (Thr), methionine (Met), tryptophan (Trp), and nonessential N (+N) supplementation of all sorghum grain (S) diets on growth and carcass characteristics of 50- to 100-kg pigs. In Exp. 1, four replicate pens of four pigs each were fed: 1) sorghum-soybean meal positive control (S-SBM); 2) S + Lys + Thr + Met + Trp to equal the amino acid concentrations in S-SBM (LTMT); 3) Diet 2 + N (LTMT+N); and 4) S negative control. Compared with pigs fed S-SBM, pigs fed LTMT or LTMT+N had reduced (P < .05) ADG, ADFI, serum urea N (SUN), pancreas weight, LMA, and percentage of muscling (PM) but higher dressing percentage (DP) and similar 10th rib fat thickness (TRF). Apparent N digestibility was lower (P < .05) in pigs fed LTMT than in pigs fed LTMT+N or S-SBM. In Exp. 2, two replicate pens of four pigs each were fed: 1) S-SBM; 2) S + Lys + Thr (LT); 3) S + Lys + Thr + Met (LTM); 4) S + Lys + Thr + Trp (LTT); 5) LTMT; 6 to 9) as 2 to 5 +N; and 10) S negative control. Compared with pigs fed S-SBM, pigs fed S, LT, LT+N, and LTM+N had lower (P < .05) ADG. Daily gain of pigs fed LTM, LTT, LTMT, LTT+N, or LTMT+N was not different (P > .10) from pigs fed S-SBM.(ABSTRACT TRUNCATED AT 250 WORDS)


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Copyright © 1995 by the American Society of Animal Science.