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Time of Processing Calves Subjected to Marketing and Shipping Stress¹

University of California, Imperial Valley Field Station, El Centro 92243

Abstract

Three-hundred-fifty-eight calves subjected to the stresses of marketing and shipping were used to determine the effects of processing at point of origin, immediately upon arrival at final destination and at a delayed time dependent upon feed consumption reaching 2% of body weight. During a 4-week receiving period delayed processing resulted in lower feed consumption, lower rate of gain and a poorer feed conversion than processing either at point of origin or on arrival at final destination. This difference persisted throughout an entire feeding period of 342 days although time of processing had no effect upon performance during the post-receiving period. There was no relationship between time of vaccination and degree of immunity to Infectious Bovine Rhinotracheitis (IBR).

¹ The cooperation of the following is gratefully acknowledged: Colorado River Feedyards, Blythe; Moiola Bros. Feedyard, Brawley; Union Feedyards, Blythe; the Anza Packing Co., El Centro and the California Cattle Feeders Assoc, Bakersfield.

² Department of Animal Science, El Centro. Present address: Clayton Livestock Research Center, New Mexico State University, Clayton, 88415.

³ Farm Advisor, Agricultural Extension Service, Riverside County.

⁴ Extension Livestock Specialist, Davis.

⁵ Veterinarian, Brawley.