Methionine requirement of pigs between 5 and 20 kilograms body weight.
Chung T.K. | Baker D.H.
Four nursery experiments were conducted using a methionine (Met)-deficient feather meal-corn-soybean meal-dried whey basal diet (20% CP; 3,250 kcal of ME/kg, 0.11% choline, 0.19% Met, 1.00% cystine) supplemented with lysine, tryptophan, and histidine to determine the Met requirement of 5- to 10- and 10- to 20-kg pigs. Based on a true Met digestibility value of 81.6% estimated by a pig ileal digestibility assay, the Met-deficient basal diet contained 0.155% of digestible Met. A preliminary experiment (Exp. 1) indicated that pigs fed the Met-deficient basal diet when fortified adequately with Met could produce weight gains similar to those of pigs fed a 20% CP practical corn-soybean meal-dried whey diet. In Exp. 2 and 3, crossbred pigs weighing 5.8 kg initially were fed diets containing graded levels of digestible Met between 0.195 and 0.355%. Average daily gain increased quadratically (P < 0.05) as the level of Met increased. When the data of Exp. 2 and 3 were examined together, the digestible Met requirement of 5- to 10-kg pigs was estimated to be 0.255% of the diet. In Exp. 4 and 5, crossbred pigs averaging 10 kg were fed digestible Met concentrations ranging from 0.155 to 0.315%. Average daily gain increased quadratically (P < 0.05). The digestible Met requirement of 10- to 20-kg pigs was estimated at 0.255% for maximal weight gain, which was similar to that of 5- to 10-kg pigs. Assuming an 89% digestibility of Met in practical corn-soybean meal diets, the total Met level needed in practice would be 0.29%. If 50% of the sulfur amino acid requirement can be furnished by cystine, the total sulfur amino acid requirement of the young pig (5 to 20 kg) would be 0.58% of the diet.
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