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Gain, Feed Conversion and Carcass Traits of Swine Fed under Two Nutritional Regimes¹

University of Nebraska, Lincoln 68503²

Abstract

DATA involving 505 Gene Pool boars, barrows and gilts and 126 Hampshire boars and gilts fed two nutritional diets were presented. One diet consisted of high lysine corn, minerals and vitamins (10% protein) while the other diet was a 14% protein corn-soy diet.

Pigs fed the low protein diet gained slower and were fatter than pigs fed the 14% protein diet. In addition, kilograms of ham and loin/day of age was less for pigs on the low protein diet indicating a slower rate of lean growth. Carcasses from pigs fed the low protein diet had more backfat, less percent ham and loin and smaller loin eye area.

Sex differences between boars and gilts were obtained for daily gain and probe in the Gene Pools but not in the Hampshires. When barrows and gilts were compared, barrows grew faster and had smaller loin eye area than gilts. No significant differences between barrows and gilts were found for backfat, carcass length, kilograms of ham and loin/day of age or percent ham and loin.

¹ Published with the approval of the Director as Paper No. 3455 Journal Series, Nebraska Agr. Exp. Sta. Research reported was conducted under Project 13-29.

² Department of Animal Science. Acknowledgment is made to Alan Keetle and Robert Hageman for assistance in caring for the experimental animals, to Dawes Laboratories, Inc., Chicago and the American Cyanamid Co., Princeton, New Jersey, for the vitamins and antibiotics used in the experimental diets and to the Calcium Carbonate Co., Quincy, Illinois, for the trace minerals.