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University of Nevada
Abstract
The data used were derived from experiments in swine feeding conducted during the period 1926 through 1945. The objective in mind when working over these experiments was to determine the effect of feeding level on daily gains. By feeding level is meant the percentage total digestible nutrients fed per day is of the mean weight of the pigs. Regression equations to indicate the effect of feeding level on daily gain were first calculated for five liveweight intervals as follows: (1) under 50 pounds; (2) 50.1 to 75 pounds; (3) 75.1 to 100 pounds; (4) 100.1 to 150 pounds, and (5) 150.1 to 200 pounds.
With the possible exception of number 4, the regression coefficients were found to be reasonably consistent. The equations however, would be difficult to apply in practice because data usually jump across any arbitrarily drawn liveweight intervals. From them an equation was derived indicating the effect of both feeding level and weight on daily gain of pigs.
Daily gain = (log W/10) (.27+.301X).
The relationship between daily gain and feeding level is straight line, but that between daily gain and liveweight is curvilinear. When using the equation, results may be taken as a standard or norm by means of which the efficiency of a ration can be judged. By its use, the effects of differences in liveweight or feeding level of groups under comparison may be eliminated. Differences in the biological value of combinations of feeds may be expressed as a percentage of expected values. Results from the Kansas, Michigan, Ohio, and Utah Experiment Stations were used to illustrate how the equation may be applied to feeding problems.
1 Chief, Department of Farm Development, University of Nevada, Reno, Nevada.
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