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

General and Comparative Endocrinology
Pedro MayorManel Lopez-Bejar

Abstract

In this study, the ovaries of 27 wild collared peccaries (Tayassu tajacu) from the 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 3beta-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.

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Citations

Aug 25, 2016·Behavioural Processes·Suleima do Socorro Bastos da SilvaDiva Anelie de Araujo Guimarães
Aug 16, 2019·Zygote : the Biology of Gametes and Early Embryos·Lívia Batista CamposAlexandre Rodrigues Silva
Mar 11, 2015·Journal of Medical Primatology·Pedro MayorFrederico Ozanan Barros Monteiro
Dec 2, 2020·Reproduction in Domestic Animals = Zuchthygiene·Ana Clara N P C S VianaLuciana M Melo

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