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The Effect of Methionine and Cystine on the Growth of Weanling Pigs¹

Purdue Agricultural Experiment Station

Abstract

When purified diets containing oxidized casein, gelatin and tryptophan to make a total of 21.0% protein in the ration were fed ad libitum, a methionine deficiency was observed in weanling Duroc pigs. The level of methionine which supported the best rate of gain and feed efficiency was 0.6% of the diet when 0.01% cystine was present in the ration.If adequate cystine was present in the ration, 0.3% methionine supported a rate of gain and feed efficiency which was equivalent to that obtained when 0.6% methionine plus 0.6% cystine were fed. Tentatively, the methionine requirement for weanling pigs is set at 0.6% of the ration in the absence and 0.3% methionine in the presence of adequate (0.3% or more) cystine.

¹ Contribution from the Departments of Animal Husbandry and Agricultural Chemistry, Journal Paper No. 483, Purdue University Agricultural Experiment Station, Lafayette, Indiana.

² Present address: Laboratory of Animal Nutrition, Alabama Polytechnic Institute, Auburn, Alabama.

³ The authors are grateful to Dr. J. Waddell, E. I. du Pont de Nemours & Co., New Brunswick, New Jersey, for the DL-lysine · HC1, and to Mr. A. Lee Caldwell, EH Lilly and Co., Indianapolis, Indiana, for the liver extract used in the experiments. Credit is due Dr. D. F. Green, Merck & Co., Rahway, New Jersey, for furnishing the APF supplement and some of the B vitamins.

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