Reproductive endocrine responses to photoperiod and exogenous gonadotropins in the pallas' cat (Otocolobus manul)

Zoo Biology - Tập 21 Số 4 - Trang 347-364 - 2002
Janine L. Brown1, Laura H. Graham1, Julie M. Wu1, Darin Collins2, William F. Swanson3
1Conservation and Research Center, National Zoological Park, Smithsonian Institution, Front Royal, Virginia
2Woodland Park Zoological Gardens, Seattle, Washington
3Center for Research of Endangered Wildlife, Cincinnati Zoo and Botanical Garden, Cincinnati, Ohio

Tóm tắt

AbstractFecal samples were collected for 14–26 months from three male and six female Pallas' cats (Otocolobus manul) to examine gonadal steroidogenic activity in response to changes in photoperiod and treatment with exogenous gonadotropins. Females exhibited a seasonal anestrus from May–December, excreting consistently low concentrations of fecal estrogens (overall mean, 50.2±8.5 ng/g). During the breeding season (January–April), baseline fecal estrogen concentrations were higher, averaging 128.4±18.9 ng/g, with peak concentrations ranging from 455.8–909.6 ng/g. Interpeak intervals in estrogen excretion ranged between 7 and 21 days, with an average estrous cycle length of 14.3±1.7 days. Two females became pregnant after natural mating, with overall luteal progestogen concentrations averaging ∼40 μg/g throughout gestation. Fecal estrogens increased in mid‐gestation, peaking just before birth. Induction of follicular development with eCG (100–300 IU, i.m.) resulted in an increase in fecal estrogens (peak range, 263.1–1198.1 ng/g), followed by a postovulatory increase in fecal progestogens (overall mean, 41.1±11.9 μg/g) after hCG (75–150 IU, i.m.). Despite apparently normal ovarian responses, none of the females conceived after artificial insemination (AI). The gonadotropin‐induced nonpregnant luteal phase lasted 49.8±5.3 days (range, 30–60 days), whereas gestation lasted ∼70 days. In the male Pallas' cat, fecal androgens were elevated from November–April (overall mean, 352.3±30.3 ng/g) compared with nadir concentrations during the rest of the year (82.1±3.3 ng/g). Entrainment of seasonality to photoperiod was demonstrated by stimulation of gonadal steroidogenic activity in cats exposed to increasing artificial light during natural (nonbreeding season) and artificially induced short‐day photoperiods. In summary, reproduction in Pallas' cats is highly seasonal and photoperiod‐dependent. Females exhibit elevated baseline and peak fecal estrogen concentrations for 3–4 months during late winter/early spring. Testicular steroidogenic activity precedes the rise in female estrogen excretion by about 2 months, presumably to ensure maximal sperm production during the breeding season. Zoo Biol 21:347–364, 2002. Published 2002 Wiley‐Liss, Inc.

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Tài liệu tham khảo

Bazer F, 1999, Encyclopedia of reproduction, 1002

10.1530/jrf.0.0630523

10.1095/biolreprod51.4.776

10.1095/biolreprod53.1.93

10.1002/(SICI)1098-2361(1996)15:4<425::AID-ZOO7>3.0.CO;2-D

10.1530/jrf.0.1060337

10.1016/B978-0-08-057109-6.50021-5

Goodman RL, 1999, Encyclopedia of reproduction, 341

10.1016/S0093-691X(00)00420-9

Gudermuth DF, 1997, Incidence of spontaneous ovulation in young, group‐housed cats based on serum and fecal concentrations of progesterone, J Reprod Fertil, 51, 1997

10.1530/jrf.0.0960175

10.1095/biolreprod56.4.1059

Lawler DF, 1993, Ovulation without stimulation in domestic cats, J Reprod Fertil, 47, 57

Mellen J, 1998, Pallas' cat (Otocolobus manul) international studbook

10.1002/zoo.1010

Nowell K, 1996, Wild cats: status survey and conservation action plan, 97

10.1071/R96048

10.1530/jrf.0.0570267

10.1530/jrf.0.0820043

10.1530/jrf.0.0980091

10.1095/biolreprod28.3.657

10.1002/zoo.1430130403

10.1095/biolreprod32.2.361

10.1095/biolreprod21.4.953

Stroganov SU, 1969, Carnivorous mammals of Siberia, 432

SwansonWF.1999.Toxoplasmosis and neonatal mortality in Pallas' cats: a survey of North American zoological institutions. In: Proceedings of the American Association of Zoo Veterinarians Conference Columbus OH. p347–50.

SwansonWF.2001.Reproductive biotechnology and conservation of the forgotten felids–the small cats. In: Proceedings of the 1st International Symposium on Assisted Reproductive Technology for the Conservation and Genetic Management of Wildlife Omaha NE. p100–20.

Swanson WF, 1996, Influence of seasonality on reproductive traits in the male Pallas' cat (Felis manul) and implications for captive management, J Zoo Wildl Med, 27, 234

10.1530/jrf.0.1060087

10.1095/biolreprod14.5.579

10.1016/0018-506X(78)90069-7

WildtDE MellenJD editors.1998.Felid regional collection plan for the American Zoo and Aquarium Association. Felid Taxon Advisory Group Meeting Disney's Animal Kingdom Lake Buena Vista FL.

Wildt DE, 1999, Encyclopedia of reproduction, 497

Yoshinaga K, 1999, Encyclopedia of reproduction, 108

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Zoo Biology

Tập 21 Số 4

347-364

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