Influence of Level of Dietary Protein and Source of Supplemental Soybean Protein on Rate and Efficiency of Gain of Pigs Weaned at an Early Age

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Abstract
TWO experiments were conducted with crossbred pigs weaned at about 21 days of age to obtain additional information on the optimum level of dietary protein from corn and soybean protein for young pigs. The effects of source of protein (soybean meal, 48.5% protein, solvent process vs. dry roasted vs. extruded soybeans) on rate of gain and gain/feed were also investigated. Four-hundred-thirty-two pigs averaging 6.2 kg initially were used in the first experiment and 270 pigs averaging 6.5 kg were utilized in the second study. Pigs fed 20 and 22% protein diets gained faster and had greater gain/feed ratios than those fed 18% protein diets in both experiments indicating that 18% protein diets may have been inadequate for the pigs used in these studies. Pigs fed the corn-soybean meal diets gained significantly faster than those fed corn-dry roasted or corn-extruded soybean diets, but gain/feed was not affected. The failure to demonstrate improved gain/feed in pigs fed diets containing heat processed whole soybeans may indicate that pigs of the weight and age used in these experiments were unable to utilize the soybean oil with maximum efficiency. There were no dietary protein level × source of supplemental soybean protein interactions for any of the response criteria. Copyright © 1972. American Society of Animal Science . Copyright 1972 by American Society of Animal Science.

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