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Journal of Animal Science, Vol 72, Issue 1 144-150, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

Digestible threonine requirements of starter and finisher pigs

C. I. Saldana, D. A. Knabe, K. Q. Owen, K. G. Burgoon and E. J. Gregg
Department of Animal Science, Texas A&M University, College Station 77843.

The digestible threonine (Thr) requirements of starter (28 d of age initially, 6 to 16 kg) and finisher (58 to 96 kg) pigs were determined. Each growth trial evaluated control and basal diets and the basal diet plus four incremental additions of L-Thr (.60 to .76% dietary Thr for starter pigs and .30 to .50% dietary Thr for finisher pigs). The basal diet fed to starter pigs contained 17.6% CP and 1.25% lysine and was based on sorghum, peanut meal, soybean meal, and dried whey. The basal diet fed to finisher pigs contained 9.7% CP and .75% lysine and was based on sorghum supplemented with lysine, methionine, tryptophan, and isoleucine. Incremental increases in dietary Thr increased (P < .05) ADG and ADFI of starter pigs quadratically. Gain/feed increased (P < .01) linearly. Based on broken-line regression analyses, .63% Thr maximized ADG of starter pigs. Daily gain and gain/feed of finisher pigs increased linearly (P < .01) and quadratically (P < .01) as dietary Thr content increased. Broken-line regression analyses determined that .41% Thr maximized ADG and gain/feed. Digestion trials with pigs fitted with an ileal T-cannula determined that the basal starter and finisher diets contained .43 and .17% apparent ileal digestible Thr and 3.35 and 3.38 Kcal of fecal DE/g, respectively. On average, crystalline Thr had an apparent ileal digestibility of 98%. Based on these values and the total Thr requirements given above, the digestible Thr requirement of finisher pigs for maximum ADG and gain/feed was estimated to be .28%.(ABSTRACT TRUNCATED AT 250 WORDS)


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X. Wang, S. Qiao, Y. Yin, L. Yue, Z. Wang, and G. Wu
A Deficiency or Excess of Dietary Threonine Reduces Protein Synthesis in Jejunum and Skeletal Muscle of Young Pigs
J. Nutr., June 1, 2007; 137(6): 1442 - 1446.
[Abstract] [Full Text] [PDF]


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Copyright © 1994 by the American Society of Animal Science.