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Evidence for pseudopregnancy and induced ovulation in captive wolverines ( Gulo gulo )
Author(s) -
Mead Rodney A.,
Bowles Mark,
Starypan Greg,
Jones Mike
Publication year - 1993
Publication title -
zoo biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.5
H-Index - 54
eISSN - 1098-2361
pISSN - 0733-3188
DOI - 10.1002/zoo.1430120405
Subject(s) - ovulation , biology , estrous cycle , endocrinology , human chorionic gonadotropin , medicine , hormone , pregnancy , equine chorionic gonadotropin , follicle , reproduction , gonadotropin , andrology , induced ovulation , ecology , genetics
Progesterone levels and vaginal smears were monitored to detect estrus and formation of corpora lutea during the first year of a 4‐year study of reproduction in captive wolverines. No evidence of spontaneous ovulation was detected during the first year, and most females did not attain complete vaginal cornification. Follicle stimulating hormone was used in subsequent years to induce estrus in several females, and human chorionic gonadotropin (hCG) was used to induce ovulation. Females treated with hCG were artificially inseminated with fresh wolverine semen. Prolonged elevation of serum progesterone above 1 ng/ml was only observed in females that received hCG. The profiles and duration of the progesterone secretory pattern of these females closely resembled that of other mustelids that exhibit a prolonged delay of implantation. Progesterone remained below 1 ng/ml throughout the year in all females that did not receive hCG. No kits were produced. The data suggest that ovulation in this species is normally induced by coitus, and that pseudopregnancy can occur, lasting as long as pregnancy. © 1993 Wiley‐Liss, Inc.