The effects of the administration and subsequent withdrawal of norethindrone and mestranol (Ortho-Novum) therapy on egg production in the chicken.
D000818:Animals; D005260:Female; D005298:Fertility / Q000187:drug effects*; D008656:Mestranol / Q000494:pharmacology*; D009640:Norethindrone / Q000494:pharmacology*; D010060:Ovulation / Q000187:drug effects*; D011200:Poultry
D008656:Mestranol; D009640:Norethindrone