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Some Plant and Animal Sources of Crude Protein for Weanling Pigs Fed in Drylot¹

University of Illinois^{,3, 4}

Abstract

In a growing-fattening test with pigs (weaning to 100 pounds live weight) in dry lot, the following protein sources were compared in rations containing ground yellow corn fortified with vitamins, minerals and antibiotic: (A) a blend of five samples of extracted soybean oil meal,(B) a new-process extracted soybean oil meal and (C) a blend of four samples of meat-and-bone scrap. Sources (A) and (B) were tested at both 16 and 18 percent levels of crude protein; source (C) was tested at 18 percent protein alone, and with the addition of 0.1 percent DL-tryptophan. The three protein sources were significantly different, barely failing to reach the 1 percent level. The addition of tryptophan to meat-and-bone scrap increased gains significantly (1 percent level). The adjusted average daily gains in pounds for the above treatments were: (A) 1.19, (B) 1.09, (C) 0.96 and (C plus 0.1 percent DL-tryptophan) 1.24. There was no significant interaction and there was no effect of increasing protein level from 16 to 18 percent.

In a protein efficiency test, semi-purified rations containing about 11 percent crude protein derived solely from the protein sources (A), (B) and (C) of the first experiment and from dried skim milk (D) were fed to weanling pigs in dry lot for 37 days. Statistical analysis of the gains showed that (D) exceeded (B) and (A) exceeded (C) at the 1 percent significance level, but (B) did not exceed (A) at the 5 percent level. For feed consumption, (D) exceeded (B) and (A) exceeded (C) at the 5 percent level, but (B) did not exceed (A), at the 5 percent level. The significance relations for gains was unchanged by covariance adjustment to equal feed consumption, although the differences were much reduced.

¹ This investigation was supported by the donation of funds and products by Central Soya Company, Inc., Fort Wayne, Indiana; Illinois Farm Supply Co., Chicago, Illinois; Merck & Company, Inc., Rahway, New Jersey and A. E. Staley Manufacturing Company, Decatur, Illinois.

² Present address: Chas. Pfizer & Co., Inc., Terre Haute, Indiana.

³ Acknowledgment is made for assistance by R. H. McDade, swine farm foreman, and his associates.

⁴ Urbana, Illinois.