title: [Seasonal characteristics of the functioning of the hypophysis-gonad system in the suslik Citellus parryi].
abstract: In experiments on the arctic ground squirrel C. parryi, studies have been made on seasonal changes in the weight of testes, follicular diameter in the ovaries and the content of sex and gonadotropic hormones in the peripheral blood. Testicular involution and arrest of follicular development were observed in prehibernation period. During hibernation, follicular growth and the increase in the weight of testes take place. The level of LH decreases during hibernation. In sleeping animals, its level is higher as compared to that in active animals during short periods of arousal. The increase in LH level takes place both in males and females in April. FSH can not be detected in males during the first half of hibernation, appearing in the peripheral blood only in March and April. In females, FSH was found in the blood in October, being absent from November to January; beginning from February, it may be found both in sleeping and active animals. Testosterone was found in hibernating males and females, its level significantly increased in March in males, being approximately constant in hibernating females. Estradiol secretion was noted in hibernating females, whereas progesterone was found in the blood only in May.
authors.forename: N V
authors.initials: NV
authors.lastname: Shvareva
authors.forename: Z G
authors.initials: ZG
authors.lastname: Nevretdinova
mesh_terms: D000818:Animals; D004958:Estradiol / Q000097:blood; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D006605:Hibernation; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D010053:Ovary / Q000502:physiology*; D010902:Pituitary Gland / Q000502:physiology*; D011374:Progesterone / Q000097:blood; D012098:Reproduction; D012589:Sciuridae / Q000502:physiology*; D012621:Seasons; D013737:Testis / Q000502:physiology*; D013739:Testosterone / Q000097:blood
chemical_list: D013739:Testosterone; D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone
vernacular_title: Sezonnye osobennosti funktsionirovaniia sistemy gipofiz-gonady u suslika Citellus parryi.