J. Anim Sci.
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J. Anim Sci. 1951. 10:371-377.
© 1951 American Society of Animal Science
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Correction Factors for Adjusting Weaning Weights of Range Calves to the Constant Age of 190 Days1

Leslie E. Johnson and C. A. Dinkel2

South Dakota Agricultural Experiment Station

Abstract

Monthly weights on 297 beef calves were studied to obtain the growth curve from birth to weaning and to calculate correction factors for adjusting weaning weights of range calves to a standard age. The data showed that the growth curve of South Dakota range calves approximated a straight line up to 155 days of age, and thereafter increased at a decreasing rate. A set of linear correction factors was developed to adjust weights taken between 120 and 155 days up to a standard age of 155 days. Two sets of factors were developed for the period 155 to 225 days of age which correct weights to the standard age of 190 days. These two sets differed in the method of calculation. Both sets were accurate enough to be highly useful, but the set based on the linear equation appeared to be the more accurate and therefore is recommended. Caution should be practiced in applying the factors to calves raised under different climatic or management conditions or to calves where the weaning weight has been taken much more than 30 days preceding or following the standard weaning age.

Footnotes

1 A contribution from the Animal Husbandry Department. Approved for publication by the Director of the South Dakota Agricultural Experiment Station: Publication No. 259 of Journal Series.

2 Animal Geneticist, Bureau Animal Industry (Formerly Head, Animal Husbandry Department), and Asst. Animal Husbandman respectively.






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Copyright © 1951 by the American Society of Animal Science.