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Effect of Feeding Level on Daily Gains of Pigs

University of Nevada

Abstract

This study is based on results obtained from feeding experiments conducted with 95 groups of pigs through a period of 20 years. The period of experimentation with each group was between weaning age and a finishing weight of approximately 200 pounds.

All groups of pigs received alfalfa in some form, a grain concentrate, and skimmilk, but part of them received an additional protein supplement and others did not. They were divided into four classes: (1) Pasture with no extra protein supplement, (2) Pasture with extra protein supplement, (3) Dry lot with no extra protein supplement, and (4) Dry lot with extra protein supplement.

The pigs in class 2 made the most rapid gain and those in class 3 the least rapid gain at any given feeding level.

With all groups included, the regression equation was found to be Y=.2+.367X in which Y represents daily gain and X the feeding level. The feeding level was found by dividing the average total digestible nutrients fed per day by the mean liveweight.

The regression equation may be used (1) to indicate the efficiency of any ration that has been used, and (2) as a means of estimating what the daily gain would be at any feeding level.

¹ Chief, Department of Farm Development, University of Nevada, Reno, Nevada.