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Weight Changes in Beef Calves Following Birth^{1, 2}

University of Nebraska³

Abstract

Calves gained about 1.2, 1.5, and 1.8 lb. during the first, second, and third 24-hour periods following birth. The average daily gain during the first 3 days closely approximated the average daily gain from birth to weaning.

The standard deviation of the error associated with taking birth weights was ±1.9 lb. The standard deviation for differences among calves was ±8.3 lb. The standard deviation of weight changes over a 12-hour time interval was ±.3.

Comparing the average change in birth weight with the error involved and the large differences found among calves indicates that adjustment for the change in birth weight during a 24-hour interval and possibly even a 48-hour interval would not increase the accuracy of calf comparisons enough to be worthwhile.

¹ Published with the approval of the Director as Paper No. 680, Journal Series, Nebraska Agricultural Experimental Station, Lincoln.

² Contribution from the Nebraska Agricultural Experiment Station in cooperation with Animal and Poultry Husbandry Research Branch, U.S.D.A.

³ Appreciation is expressed to Dr. H. H. Stonaker and the Colorado Agricultural Experiment Station for furnishing data.