Seasonal changes in follicle-stimulating hormone in a breeding population of barheaded geese, Anser indicus.
Changes in the plasma titers of follicle-stimulating hormone were investigated in a free-living population of barheaded geese over the whole year. Adult males had pronounced seasonal changes from prebreeding levels of approximately equal to 20 ng/ml to a peak in the breeding season of about 300 ng/ml. Changes in females were only slight. An increase from nondetectable, approximately equal to 20 ng/ml to a mean of 32.2 ng/ml before egg-laying was found. The data are discussed with regard to the literature on free-living species and the previously published data on LH and testosterone levels in the same birds.
D000818:Animals; D001947:Breeding; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood / Q000502:physiology*; D005777:Geese / Q000502:physiology*; D008297:Male; D012621:Seasons
D005640:Follicle Stimulating Hormone