Opaque-2 Corn, Normal Corn and Corn-Soybean Meal Gestation Diets for Swine Reproduction

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Abstract
BAR and Daunay (1905) showed that the improved feed efficiency of gestating swine was due to an anabolism during pregnancy that surpassed the requirements of the developing conceptus. This anabolism resulted in a particular propensity for gravid swine to utilize protein more efficiently than non-gravid swine (Jacquot, 1953; Jacquot et al., 1959; Bourdel, 1960; Salmon-Legagneur, 1965). Lenkeit (1957) found that feeding only 131 g of digestible protein per day to gestating swine did not affect the number of pigs farrowed per litter. Pond et al. (1968) fed a protein-free diet to gilts throughout gestation without significantly altering litter size. In a long-term study, Holden et al. (1968) fed an 8% protein corn-soybean meal diet throughout gestation and lactation without affecting litter size, birth weight or weaning weight. Fortified normal corn diets in which all the protein comes from corn have been fed to gestating gilts (Pond et al., 1968; Hawton and Meade, 1969) and to gestating sows (Rippel et al., 1965); however, no long-term studies have been reported involving fortified normal corn or opaque-2 corn diets to gravid swine as the only source of protein. Copyright © 1970. American Society of Animal Science . Copyright 1970 by American Society of Animal Science

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