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Energy utilization in the laying hen in relation to ambient temperature

Published online by Cambridge University Press:  27 March 2009

R. H. Davis ,
O. E. M. Hassan  and
A. H. Sykes
R. H. Davis
Affiliation:
Wye College (University of London), Wye, Ashford, Kent
A. H. Sykes
Affiliation:
Wye College (University of London), Wye, Ashford, Kent
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Summary

Energy balances have been determined, using the comparative slaughter procedure, over 3-week periods on groups of laying hens kept at ambient temperatures of 7·2, 15·6, 23·9, 29·4 and 35 °C.

Energy intake declined as the environment became warmer (kcal ME/kg¾/day = 203· 1·13°C); heat production, as measured by the difference between energy intake and energy retention, also declined with increasing ambient temperature (kcal/kg¾/day = 151 – 1·11°C). There was a linear relationship between heat production and ambient temperature with no thermoneutral zone or critical temperature.

The energy available for egg production remained almost constant at 50 kcal/kg¾/day equivalent to a rate of egg production of 82% at each ambient temperature.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 81 , Issue 1 , August 1973 , pp. 173 - 177
Copyright
Copyright © Cambridge University Press 1973

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