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(I) The heat production of hens and cockerels maintained for an extended period of time at a constant environmental temperature of 23 deg C. (II) Observations on the effect of environmental temperature and environment at moult on the heat production and energy requirements of hens and cockerels of a White Leghorn strain



(I) The heat production of hens and cockerels maintained for an extended period of time at a constant environmental temperature of 23 deg C. (II) Observations on the effect of environmental temperature and environment at moult on the heat production and energy requirements of hens and cockerels of a White Leghorn strain



Journal of Agricultural Science 82(Part 3): 549-552, 553-558



Hens and cockerels of a White Leghorn strain ('H & N') were kept at a constant temperature of 23 deg C from 1 year until 21/4 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 hens and between 223 and 349 for cockerels. The sex difference in heat production is discussed and an attempt is made to explain the variation in heat production for each sex.

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