Plasma sex hormone and lipid patterns in normal and restricted-ovulator chicken hens.
The relationships of circulating estradiol, estrone, and progesterone levels to plasma lipid levels and ovulatory frequency were studies in sexually mature hens. New Hampshire X Columbian (NH X C) cross-bred hens, which have a relatively low frequency of ovulation, were compared with pure-bred White Leghorn (WLH) hens with a high frequency of ovulation. A mutant strain of WLH hen, exhibiting the phenotypic characteristic of restricted ovulation (RO) was also tested. It was fund that NH X C hens had a basal circulating estrogen: progesterone ratio 2.7 X greater than WLH hens. Furthermore, WLH-RO hens exhibited 3 X HIGHER BASAL PLASMA ESTROGEN AND 4 X lower progesterone than normal WLH hens, resulting in an estrogen:progesterone ratio which was l2.6X higher. In additional, WLH-RO hens did not exhibit any diurnal variation in circulating progesterone levels, and had smaller primary sex organs and also intermittent hyperlipidemia. It is concluded that the basal circulating estrogen:progesterone ratio in sexually mature hens is a good indicator of ovulatory frequency, and that the magnitude of the ratio is determined primarily by the progesterone component.
D000375:Aging; D000818:Animals; D002645:Chickens; D002784:Cholesterol / Q000097:blood; D004958:Estradiol / Q000097:blood; D004970:Estrone / Q000097:blood; D005260:Female; D012739:Gonadal Steroid Hormones / Q000097:blood*; D008055:Lipids / Q000097:blood*; D010060:Ovulation; D010641:Phenotype; D011374:Progesterone / Q000097:blood; D011863:Radioimmunoassay; D014280:Triglycerides / Q000097:blood
D012739:Gonadal Steroid Hormones; D008055:Lipids; D014280:Triglycerides; D004970:Estrone; D011374:Progesterone; D004958:Estradiol; D002784:Cholesterol