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Seasonal absence of supplementary corpora lutea in pregnant mares and the relationship with pregnancy loss.
Newcombe, John R; Wilsher, Sandra; Silva, Elisa S M; Sala-Ayala, Laura; Cuervo-Arango, Juan.
Afiliação
  • Newcombe JR; Warren House Farm, Equine Fertility Clinic, Brownhills, West Midlands, UK.
  • Wilsher S; Sharjah Equine Hospital, Sharjah, United Arab Emirates; The Paul Mellon Laboratory of Equine Reproduction, "Brunswick", Newmarket, Suffolk, UK.
  • Silva ESM; Faculty of Veterinary Medicine, Federal University of Uberlandia, MG, Brazil.
  • Sala-Ayala L; Equine Fertility Group, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, Valencia, Spain.
  • Cuervo-Arango J; Equine Fertility Group, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, Valencia, Spain. Electronic address: juan.cuervo@uchceu.es.
J Equine Vet Sci ; 131: 104960, 2023 Dec.
Article em En | MEDLINE | ID: mdl-37925112
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.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Anestro / Corpo Lúteo Limite: Animals / Pregnancy País/Região como assunto: America do sul / Brasil Idioma: En Revista: J Equine Vet Sci Ano de publicação: 2023 Tipo de documento: Article País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Anestro / Corpo Lúteo Limite: Animals / Pregnancy País/Região como assunto: America do sul / Brasil Idioma: En Revista: J Equine Vet Sci Ano de publicação: 2023 Tipo de documento: Article País de publicação: Estados Unidos