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How Much Accuracy is Gained by Weighing Cattle Three Days Intead of One at the Beginning and End of Feeding Experiments

Texas Agricultural Experiment Station

W. H. Black

U. S. Department of Agriculture

Abstract

Opportunity to study the relative accuracy of three-day and one-day weights under feedlot conditions was afforded by the unusually large number of comparable steers weighed for three successive days at the beginning and end of feeding experiments conducted one year at Kingsville and three years at Big Spring, Texas¹.

The individual weight records were analyzed by methods of multiple correlation. All the steers in each experiment were treated as a single group at the beginning of the experiment and as another single group at the end. Wherever two lots within a single group differed in their average weight as much as 10 pounds per head, the correlations and standard deviations were corrected for heterogeneity by the method explained by Wright² and also used by Richey and Willier³. Such corrections had to be applied to both initial and final weights at Kingsville and to the final weights all three years at Big Spring.

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