The Martina Franca (MF) donkey breed, with 48 jackasses and 515 jennies, is considered an endangered breed according to the data from the Monitoring Institute for Rare Breeds and Seeds in Europe. The knowledge of the estrous cycle characteristics has a great impact for assisted reproduction, especially in endangered species. In this study, the estrous cycle characteristics were investigated in 12 MF jennies throughout the year. Estrous cycle, estrous and diestrous lengths, follicular growth and ovulation, and estradiol-17b (E2) and progesterone (P4) plasma concentrations were monitored in MF jennies and compared in different seasons. In all jennies (100%) estrous cycle was detected during the whole year, with no differences in the estrous cycle length among seasons. However, a significant increase of estrous length in spring and summer compared with autumn and winter was found. Diestrus was shorter in summer than in the other seasons. Estrous behavior was always shown and characterized by rhythmic eversion of the vulvar labia (winking) with exhibition of the clitoris, urination, male receptivity and clapping, with sialorrhoea, neck and head extension, and back ears. Estrus was characterized by the ovulation of a larger follicle in spring and summer than in autumn and winter. The pattern of E2 and P4 plasma concentrations during the estrous cycle were similar to that reported for the mare, but without differences among the four seasons, so that a negligible effect of environmental conditions on ovarian E2 and P4 secretionwas hypothesized, despite the larger diameter of the ovulating follicle in spring and summer.
Effect of the season on some aspects of the estrous cycle in Martina Franca donkey / A. Contri, D. Robbe, A. Gloria, I. De Amicis, M.C. Veronesi, A. Carluccio. - In: THERIOGENOLOGY. - ISSN 0093-691X. - 81:5(2014 Mar 15), pp. 657-661.
|Titolo:||Effect of the season on some aspects of the estrous cycle in Martina Franca donkey|
VERONESI, MARIA CRISTINA (Penultimo)
|Parole Chiave:||Donkey; Estrous behavior; Estrous cycle; Follicular dynamic; Ovulation|
|Settore Scientifico Disciplinare:||Settore VET/10 - Clinica Ostetrica e Ginecologia Veterinaria|
|Data di pubblicazione:||15-mar-2014|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.theriogenology.2013.12.010|
|Appare nelle tipologie:||01 - Articolo su periodico|
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