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Journal of Nutrition Vol. 111 No. 2 February 1981, pp. 298-306
Copyright © 1981 by American Society for Nutrition
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Regulation of Calcium Appetite in Broiler Chickens1

Bruce Lobaugh, Irving G. Joshua2 and Werner J. Mueller3

Department of Poultry Science, 213 Animal Industries Bldg., The Pennsylvania State University, University Park, PA 16802

The regulation of the appetite for calcium was studied in broiler chickens which had been trained to meet their calcium requirement by consuming a calcium supplement (10% Ca) provided separately from a calcium-deficient feed (0.12% Ca). Calcium supplement intake was reduced within 150 minutes after intravenous injection of 60 U/kg parathyroid hormone or continuous infusion of 0.077 mg/minute calcium into one common carotid artery. Supplement consumption was also depressed during the first 8 days of continuous infusion of 1 U/kg/hour parathyroid hormone; after 8 days the birds became refractory. Continuous infusion of 0.2 Medical Research Council (MRC) units/kg salmon calcitonin for 10 days or daily intramuscular injections of 1 mg/kg testosterone propionate and 2 mg/kg estradiol dipropionate for 12 days, either alone or in combination, had no effect on calcium appetite. It is concluded that the calcium appetite may be inhibited by increased concentrations of ionic calcium in blood and that the change in behavior is sufficiently rapid to play a role in the calcium homeostasis of birds.

KEY WORDS: • calcium • appetite • parathyroid hormone • calcitonin

1 Authorized as paper no. 5869 in the Journal Series of the Pennsylvania Agricultural Experiment Station. Supported in part by National Institutes of Health Grant AM 04362.

2 Present address: Department of Poultry Husbandry, University of Missouri, Columbia MO 65201.

3 To whom reprint requests should be sent.

Manuscript received 3 June 1980.




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