Ovarian features of the wild collared peccary (Tayassu tajacu) from the northeastern Peruvian Amazon

Mayor, P. and Fenech, M. and Bodmer, R.E. and Lopez-Bejar, M. (2006) Ovarian features of the wild collared peccary (Tayassu tajacu) from the northeastern Peruvian Amazon. General and Comparative Endocrinology, 147 (3). pp. 268-275. ISSN 0016-6480. (The full text of this publication is not available from this repository)

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Abstract

In this study, the ovaries of 27 wild collared peccaries (Tayassu tajacu) fromthe Amazonian region of northeastern Peru were examined macroscopically and microscopically, and expression of major steroidogenic enzymes was detected by immunohistochemistry. Our observations suggest a mean ovulation rate of 2.3 +/- 0.6 follicles and a low rate of reproductive wastage (0.4 +/- 0.6 oocytes or embryos per pregnancy). The collared peccary seems to exhibit follicular waves involving the synchronous growth of a cohort of follicles, several of which seem to attain selection. The presence of antral follicles in pregnant females suggests that follicular turnover continues during pregnancy. In cyclic animals, corpora lutea were characterised by the presence of distinct large and small luteal cell populations. The luteal volume in pregnant females was larger than that recorded for non-pregnant females. Through immunohistochemistry, it was observed that luteal cells from active corpora lutea exhibit intensive 3 beta-HSD expression in advanced stages of pregnancy. This suggests that the corpora lutea seems to remain steroidogenically active throughout pregnancy and likely contribute to progesterone production during pregnancy. (c) 2006 Elsevier Inc. All rights reserved.

Item Type: Article
Additional information: ISI Document Delivery No.: 052NK Times Cited: 1 Cited Reference Count: 47
Uncontrolled keywords: collared peccary; Tayassu tajacu; ovary; steroidogenic enzymes; reproductive biology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GN Anthropology
Divisions: Faculties > Social Sciences > School of Anthropology and Conservation > DICE (Durrell Institute of Conservation and Ecology)
Depositing User: C.G.W.G. van-de-Benderskum
Date Deposited: 08 Sep 2008 10:46
Last Modified: 14 Jan 2010 14:40
Resource URI: http://kar.kent.ac.uk/id/eprint/10319 (The current URI for this page, for reference purposes)
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