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Nitrogen Balance and Serum Protein Response of Gestating Swine Fed Opaque-2 Corn, Normal Corn and Corn-Soybean Diets¹

Purdue University, Lafayette, Indiana

Abstract

HESBY et al. (1970) and others (Lenkeit, 1957; Livingstone, MacPherson and Elsley, 1966; Holden et al., 1968) demonstrated that litter size, pig birth weight and weaning weight at different ages were unresponsive to different levels of protein fed during the complete gestation period. Due to gravid anabolism (Bourdel and Jacquot, 1959), large maternal tissue weight increases occur during gestation. Extrauterine weight gain during gestation was almost twice the weight gain of the uterine content of 100 sows analyzed by Salmon-Legagneur (1965). A net gain of 1,248 g of nitrogen per sow was found when compared to the nitrogen content of a nongravid sow. However, only 276 g of the nitrogen was accounted for by the total uterine contents. Rippel et al. (1965) showed that nitrogen retention plateaued at an intake of approximately 12.5% dietary protein when gilts were fed graded levels of protein during the last one-third of gestation. Each gilt received 2.22 kg once daily of the assigned diet.

¹ Department of Animal Sciences Journal Paper No. 3930, Purdue University Agricultural Experiment Station.