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Effects of timing and size of daylength change on brown egg laying domestic hens: plasma luteinising hormone concentration and sexual maturity.

Authors
Type
Published Article
Journal
British poultry science
Publication Date
Volume
35
Issue
1
Pages
25–31
Identifiers
PMID: 8199887
Source
Medline
License
Unknown

Abstract

1. Brown egg laying pullets were transferred from an 8-h photoperiod to an 8-, 10-, 13- or 16-h photoperiod at 6, 9, 12, 15, 18 or 20.3 weeks of age. Plasma luteinising hormone (LH) concentrations were measured at transfer and 7 and 14 d afterwards. 2. Significant increases in plasma LH occurred following light stimulations at 6, 9 and 12 weeks of age. 3. Changes in LH concentration 7 d after a light increase from 8 h to 8, 10, 13, 16 h were highly correlated with photoperiod length at 9 and 12 weeks of age. 4. Changes in LH were generally poorly correlated with age at sexual maturity, although the reduced influence on age at first egg of a light increase given close to sexual maturity was reflected in minimal LH responses at 18 and 20.3 weeks.

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