Literaturdatenbank
Literaturdatenbank |
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Kuchling, G., & Razandrimamilafiniarivo, O. C. (1999). The use of ultrasound scanning to study the relationship of vitellogenesis, mating, egg production and follicular atresia in captive ploughshare tortoises geochelone yniphora. Dodo, 35, 109–115.
Added by: Admin (14 Aug 2008 22:46:48 UTC) |
| Resource type: Journal Article BibTeX citation key: Kuchling1999 View all bibliographic details  |
Categories: General Keywords: Astrochelys, Astrochelys yniphora, Fortpflanzung = reproduction, Geochelone, Schildkröten = turtles + tortoises, Testudinidae, Untersuchungsmethoden = examination method, Veterinärmedizin = veterinary medicine Creators: Kuchling, Razandrimamilafiniarivo Collection: Dodo |
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| Abstract |
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Testudinidae Geochelone yniphora Reproductive organs of seven female ploughshare tortoises, Geochelone yniphora, at the Durren Wildlife Conservation Trust's tortoise breeding centre at Ampijoroa, Madagascar, were examined by ultrasound scanning. Structures which could be identified included vitellogenic ovarian follicles of various sizes (September and March/April), preovulatory follicles (March/April), atretic follicles (September and March/April), oviducal eggs (March/April) and in one case previtellogenic follicles in juvenile ovaries. Vitellogenesis was weil under way during September, more than two months before the start of the mating season. Mating and nesting data of the last eight breeding seasons suggest that ovulation and egg production only occurred when copulations took place during the mating season and that the vitellogenic follicles of un-mated females became atretic and were re-absorbed Added by: Admin Last edited by: Admin |