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Effect of Air Velocity on Gains and Physiological Adjustments of Hereford Steers in a High Temperature Environment^{1, 2,}

University of California, Davis

Abstract

Supplementing natural air movement with fans during two summers in the Imperial Valley of California (average daily temperatures were near 90° F.) indicated the following:

1. No significant increases in animal productivity could be attributed to increased air velocity when shade was available to animals in wire or cable corrals.
   
2. Fans significantly lowered rectal temperature, surface temperature,and respiration rate when no shade was available, and did not affect these parameters when the animals had shade.
   
3. Water intake per pound of dry matter consumed was lowered by shade and by the combination of shade and a fan.
   
4. Wire corrals provided a more comfortable summer environment than wooden corrals.
   

¹ Cooperative project between the University of California and the U.S.D.A. The authors wish to acknowledge the assistance of Herdsmen, Phil Trask and Delbert Gaskin.

² Grateful acknowledgement is made to the late Nicholas R. Ittner under whose guidance the 1957 trial was conducted.

³ Department of Animal Husbandry, El Centra.

⁴ Agricultural Engineer, U.S.D.A., Davis.

⁵ Department of Agricultural Engineering, Davis.