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Sulfur Amino Acid Requirement of the Pregnant Gilt¹

Iowa Agriculture and Home Economics Experiment Station, Ames 50010²

Abstract

With reductions in intake of crude protein during pregnancy, as in the recent experiments of Clawson et al. (1963), Frobish, Speer and Hays (1966), Rippel et al. (1965b) and Holden et al. (1968), it becomes increasingly important to determine the essentiality and quantitative requirements of amino acids. Holden et al. (1968) fed 1.82 kg daily of diets containing a ratio of 2.4 parts corn to 1.0 part soybean meal and diluted with corn starch and dextrose to provide diets containing 8, 12, 16 or 20% protein. Forty-two sows were fed these diets through four parities and no differences were observed in response criteria. Lucas et al. (1969) measured amino acid levels in these diets and in the plasma of the sows and concluded that the sulfur amino acids were first-limiting in the 8% crude protein diet.

Rippel et al. (1965a) estimated the sulfur amino acid requirement of gilts during the third trimester of pregnancy.

¹ Journal Paper No. J-6663 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Project No. 1786.

² Department of Animal Science.