J. Appl. Poult. Res.
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J APPL POULT RES 1998. 7:138-143
© 1998 Poultry Science Association
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Research Reports

Feed Withdrawal, Potassium Chloride, and Carbonated Water Effects on Broiler Thermotolerance

A. G. Soutyrine

Center of Biological Studies, University of Juarez, Chihuahua, Mexico 32310; Phone: (819) 770-3463; FAX: (819) 776-2988

M. O. Smith

Department of Animal Science, University of Tennessee, Knoxville, TN 37901

B. Sivanadian

Department of Animal/Poultry Science, University of Guelph, Guelph, ON N1G 2W1, Canada

Correspondence: A. G. Soutyrine

High summer temperature causes significant losses in growth performance in broiler production. This study examined the effects of various feed withdrawal periods (10, 8, and 6 hr) and K salt solution or carbonated water on various growth and physiological responses of commercial broilers reared under natural heat stress. Responses measured included body weight, livability, feed efficiency, water consumption, body temperature, and respiration rate. Birds subjected to feed withdrawal always exhibited better performance than the control, with 8-hr feed withdrawal yielding the best response in most performance traits of 7-wk-old birds. The combination of the 8-hr feed withdrawal and KCl in water had a significant effect on body weight, feed efficiency, water consumption, and body temperature. Broilers reared at elevated temperature with anti-heat stress measures (feed withdrawal, KCl in water, CO2 in water) showed significant improvements in performance and physiological variables after 6 wk of age.

Key Words: Broiler thermotolerance • carbonated water • electrolyte • feed withdrawal period • heat stress






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