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Ambient temperature and the egg laying characteristics of laying fowl

Published online by Cambridge University Press:  18 September 2007

A.A. Al-Saffar
Affiliation:
National Institute of Poultry Husbandry, Harper Adams University College, Newport, Shropshire, TF10 8NB, United Kingdom Kuwait Institute for Scientific Research, Safat, 13109, Kuwait
S.P. Rose*
Affiliation:
National Institute of Poultry Husbandry, Harper Adams University College, Newport, Shropshire, TF10 8NB, United Kingdom
*
*Corresponding author: e-mail: [email protected]
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Abstract

Laying hens have physiological responses that affect their productive performance when given different ambient temperatures. The objectives of this study were, first, to quantitatively describe the relationship between different constant environmental temperatures and egg production characteristics of laying hens by a statistical analysis and assessment of the published literature. Second, to compare the effect of different cycling environmental temperatures on the egg production characteristics of laying hens. Twenty-nine experiments were selected that had compared different constant temperatures and that included 21°C within their range. Differences in egg production were expressed as a proportion of the treatment group given 21°C within that experiment. An exponential curve with the addition of a linear trend gave the best (P<0.001) description of egg numbers, weight and mass, feed intakes and egg composition variables. There was a linear decrease (P<0.001) in measures of shell strength with increasing temperature. A second statistical analysis compared eight published experiments that had described the egg laying responses of laying hens kept in daily fluctuating temperatures and had been compared to a treatment group kept at 21°C within the same experiment. The results indicated that the egg laying responses of the hens were best predicted by computing the mean of the predicted responses to each of the temperatures that occurred during the day. However, information on the low temperature, the proportion of the day at the low temperature and the amplitude of the temperature cycle were required to give a precise prediction of the egg laying responses.

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Reviews
Copyright
Copyright © Cambridge University Press 2002

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