J. Anim Sci.
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J. Anim Sci. 1989. 67:1678-1686.
© 1989 American Society of Animal Science
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Effects of Preconditioning on Performance of Beef Calves before and after Entering the Feedlot1

E. B. Peterson2, D. R. Strohbehn3, G. W. Ladd4 and R. L. Willham3

Iowa State University, Ames 50011

Abstract

A 24 factorial arrangement was used to measure effects of creep feeding and of timing of weaning, vaccination, and dehorning and castration upon weight gains of beef calves before and after sale to a feedlot. Linear and interaction effects were measured. Calves that were dehorned and castrated (DC) and vaccinated (V) 4 wk before sale and weaned after sale to a feedlot gained 13 kg less at sale time (P < .01) than animals not DC and V until after sale. However, animals that were DC and V 10 wk before sale and weaned 6 wk before sale were able to recover the weight lost from these stresses (P < .01) before sale time. Creep-fed animals gained more weight before sale to a feedlot than did non-creep-fed animals (P<.01). Creep-fed calves weaned before sale to a feedlot gained less weight before the sale than did creep-fed calves weaned at sale time (P < .01). Calves weaned 6 wk before sale to a feedlot had a higher average daily gain in the feedlot than animals weaned at sale (P < .05). Calves that were DC and V simultaneously, 4 wk before weaning, had higher average daily gains in the feedlot than those that were DC and V at different times, this suggests that animals that were stressed less frequently performed better.

Footnotes

1 Journal Paper No. 11529 of the Iowa Agric. and Home Econ. Exp. Sta., Ames. Project No. 2369. Helpful comments from B. Wade Brorsen are gratefully acknowledged.

2 Dept. of Agric. Econ., Purdue Univ., West Lafayette, IN.

3 Dept. of Anim. Sci.

4 Dept. of Econ.






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