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The heat production of hens and cockerels maintained for an extended period of time at a constant environmental temperature of 23 °C

Published online by Cambridge University Press:  27 March 2009

S. J. B. O'Neill  and
N. Jackson
S. J. B. O'Neill
Affiliation:
Department of Agricultural and Food Chemistry, Queen's University, Belfast BT9 5PX, and Department of Agriculture, Northern Ireland
N. Jackson
Affiliation:
Department of Agricultural and Food Chemistry, Queen's University, Belfast BT9 5PX, and Department of Agriculture, Northern Ireland
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Summary

Hens and cockerels of a White Leghorn strain (‘H & N’) were kept at a constant temperature of 23 °C from 1 year until 2¼ years of age. The mean fasting heat production, which was measured 6 times during this period, varied between 404 and 464 kJ/kg0·75/day for the hens and between 223 and 349 kJ/kg0·75/day for the cockerels. The sex difference in heat production is discussed and an attempt is made to explain the variation in heat production for each sex.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 82 , Issue 3 , June 1974 , pp. 549 - 552
Copyright
Copyright © Cambridge University Press 1974

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