Critical Day Lengths for Egg Production and Photorefractoriness in the Domestic Turkey
نویسندگان
چکیده
منابع مشابه
Exposure duration to long day lengths associated with the expression of photorefractoriness in turkey breeder hens.
In addition to inducing egg production, exposure to long days concomitantly activates processes that eventually result in photorefractoriness (PR) and cessation of egg production. Experiments were conducted to evaluate the duration of exposure to long days that result in these processes. In each of 3 experiments, we subjected Large White turkey breeder hens to long days (16 or 18 h per day) for...
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15 صفحه اولPhotoresponsiveness of turkey breeder hens changes during the egg-laying season: relative and absolute photorefractoriness.
Photosensitive species undergo neuroendocrine changes during a reproductive season that cause them to gradually become unresponsive to a photoperiod that initially stimulated reproduction. They may first become relatively photorefractory (rPR), when they will cease egg laying only if photoperiod is reduced, and then absolutely photorefractory (aPR), when they will cease laying despite long day ...
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15 صفحه اولImmune function in turkey breeder hens during the short day prelighting period and renewal of photosensitivity for egg production.
Photorefractoriness (PR) in the turkey breeder hen is characterized by a lack of responsiveness to photoperiods that previously induced or maintained egg production. The consequence of PR is spontaneous regression of ovarian function and cessation of lay. Photosensitivity (PS) may be regained by giving at least 8 wk of short photoperiod (8L:16D) (light restriction). Following the transition fro...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1994
ISSN: 0032-5791
DOI: 10.3382/ps.0731906