Effect of constant and of changing photoperiod on plasma LH and FSH concentrations and age at first egg in layer strains of domestic pullets

Author： Lewis P. D. Perry G. C. Morris T. R. Douthwaite J. A. Bentley G. E.

Publisher： Taylor & Francis Ltd

ISSN： 1466-1799

Source： British Poultry Science, Vol.39, Iss.5, 1998-12, pp. : 662-670

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