Effect of the Thyroid Hormone on Egg Production of White Leghorn Hens
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چکیده
منابع مشابه
Initiating egg production in turkey breeder hens: thyroid hormone involvement.
The role of thyroid hormones in the expression of photosensitivity-photorefractoriness in female turkeys was investigated through the use of an antithyroidal agent, 6-n-propyl-2-thiouracil (PTU). In experiment 1, females held continuously from hatch on long day lengths (16L:8D; LD) and fed 0.1% PTU from 0 to 16 wk, began laying eggs at 26 wk of age, peaking at 75% hen-day egg production by 29 w...
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Egg production curves describe the laying patterns of hen populations over time. The objectives of this study were to fit the weekly egg production rate of selected and nonselected lines of a White Leghorn hen population, using nonlinear and segmented polynomial models, and to study how the selection process changed the egg-laying patterns between these 2 lines. Weekly egg production rates over...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1945
ISSN: 0032-5791
DOI: 10.3382/ps.0240171