Seasonal absence of supplementary corpora lutea in pregnant mares and the relationship with pregnancy loss
Rattachement africain : ae, gb, br, es. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Two experiments were conducted in the Northern (UK) and Southern (Brazil) hemispheres to determine the effect of season (month of conception) on the development of supplementary CL (SCL) and the relationship with pregnancy loss. In experiment 1, 199 pregnancies were followed between Day 14 and term, to determine the number of SCL and pregnancy viability (Northern Hemisphere). From the 199 pregnancies, 178 were obtained from inseminations during the breeding season (March-September), while the rest, 21 pregnancies resulted from conceptions in the non-breeding season (October to February). Pregnancies conceived in the breeding season were more likely (P < 0.01) to have at least 1 SCL (75.8 %, 135/178) than pregnancies from the non-breeding season (33 %, 7/21). However, the pregnancy loss between Days 35 and 120 of pregnancy in mares with no SCL was similar (3.5 %, 2/57; P >0.1) than from mares with SCL (1.4 %, 2/142). In Experiment 2 (Southern Hemisphere), three groups of recipients were used based on their ovarian activity at the time of embryo transfer: Anestrus (n = 8), transitional (n = 7) and cyclic (n = 7) recipient mares. While all transitional and cyclic mares developed at least 1 SCL, only 50 % of anestrous recipients (4/8) developed SCL by 120 of gestation. In conclusion, the development of SCL in pregnant mares is influenced by the time of season of conception, therefore it appears to be regulated by the photoperiod and the endogenous seasonal variation in gonadotropin concentrations. Mares with no SCL were not at increased risk of pregnancy loss.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Seasonal absence of supplementary corpora lutea in pregnant mares and the relationship with pregnancy loss
- Date Crossref
- 01/12/2023
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Sharjah pays non établi dans la noticeUniversité ou école supérieure
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Newmarket Equine Hospital pays non établi dans la noticeÉtablissement de santé
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Universidade Federal de Uberlândia pays non établi dans la noticeUniversité ou école supérieure
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Universidad Cardenal Herrera CEU pays non établi dans la noticeUniversité ou école supérieure
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Equine Fertility Clinic Warren House Farm pays non établi dans la noticeÉtablissement de santé
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Sharjah Equine Hospital pays non établi dans la noticeÉtablissement de santé
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The Paul Mellon Laboratory of Equine Reproduction pays non établi dans la noticeStructure de recherche
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Faculty of Veterinary Medicine pays non établi dans la noticeUniversité ou école supérieure
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Equine Fertility Group pays non établi dans la noticeInstitution
University of Sharjah, Newmarket Equine Hospital et Universidade Federal de Uberlândia, avec 6 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.