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Research note: an amendment to the model for predicting age at sexual maturity for growing pullets of layer strains given two opposing changes in photoperiod

Published online by Cambridge University Press:  17 March 2008

P. D. LEWIS  and
T. R. MORRIS
P. D. LEWIS*
Affiliation:
Animal and Poultry Science, School of Agricultural Sciences and Agribusiness, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa.
T. R. MORRIS
Affiliation:
Animal and Poultry Science, School of Agricultural Sciences and Agribusiness, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa.
*
*To whom all correspondence should be addressed. Email: [email protected]
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Abstract

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Type
Animals
Information
The Journal of Agricultural Science , Volume 146 , Issue 5 , October 2008 , pp. 591 - 594
Copyright
Copyright © 2008 Cambridge University Press

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Footnotes

Present address: Northcot, Cowdown Lane, Goodworth Clatford, Andover, Hants SP11 7HG, UK.

References

REFERENCES

Lewis, P. D. & Gous, R. M. (2006). Effect of temporary transfers to 14 h on age at first egg in domestic pullets reared on 8-h photoperiods. British Poultry Science 47, 641–645.Google Scholar
Lewis, P. D. & Morris, T. R. (2004). Research note: amendments to the model for predicting age at sexual maturity for growing pullets of layer strains following changes in photoperiod. Journal of Agricultural Science, Cambridge 142, 613–614.CrossRefGoogle Scholar
Lewis, P. D., Perry, G. C., Morris, T. R. & Follett, B. K. (1994). Effects of timing and size of daylength change on brown egg laying domestic hens, I. Plasma Luteinizing Hormone concentration and sexual maturity. British Poultry Science 35, 25–31.Google Scholar
Lewis, P. D., Perry, G. C. & Morris, T. R. (1996). Effect of constant and of changing photoperiods on age at first egg and related traits in pullets. British Poultry Science 37, 885–894.Google Scholar
Lewis, P. D., Perry, G. C., Morris, T. R., Douthwaite, J. A. & Bentley, G. E. (1998). Effect of constant and of changing photoperiod on plasma LH and FSH concentrations and age at first egg in layer strains of domestic pullets. British Poultry Science 39, 662–670.Google Scholar
Lewis, P. D., Morris, T. R. & Perry, G. C. (2003). Effect of two opposing changes in photoperiod upon age at first egg in layer strains of pullets. Journal of Agricultural Science, Cambridge 140, 373–379.Google Scholar
Wilson, S. C. (1982). Evidence of a photoinducible phase for the release of luteinizing hormone in the domestic hen. Journal of Endocrinology 94, 397–406.Google Scholar