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Response of layers to ahemeral light cycles incorporating age at application and changes in effective photoperiod

Published online by Cambridge University Press:  18 September 2007

M.M. Shanawany
M.M. Shanawany
Affiliation:
Institüt für Tierwissenschaften, Technischen Universität München, 8050 Freising-Weihenstephan, Germany
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Abstract

The possible influence of age at change in cycle length and differences in effective photoperiod (Δp) on the response of layers to ahemeral light cycles have been examined. A brief account of the physiology of pattern of lay in the hen is given.

When an ahemeral light cycle is applied, mean rate of lay in relation to a normal 24-h cycle changes. The change in mean rate of lay depends upon the rate of ovarian follicular maturation of the individuals in the flock at the time of change to an ahemeral cycle. Early in lay, when rate of follicular maturation is rapid, changing to a long light cycle reduces rate of lay, whereas changing to a short cycle could increase rate of lay. As rate of follicular maturation declines with age, changing to a long cycle late in lay leads to an improvement in rate of lay. Based on published reports, a theoretical curve of the response to a 28-h cycle is given showing the significance of age at which application is made. From the available literature it appears that, provided Δp ≥ 0, response to ahemeral light cycles is not affected.

Keywords

Ageahemeraldomestic fowlegg productionlight cyclephotoperiod
Type
Research Article
Information
World's Poultry Science Journal , Volume 48 , Issue 2 , July 1992 , pp. 156 - 164
Copyright
Copyright © Cambridge University Press 1992

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