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Seasonal absence of supplementary corpora lutea in pregnant mares and the relationship with pregnancy loss


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Título : Seasonal absence of supplementary corpora lutea in pregnant mares and the relationship with pregnancy loss
Autor : Newcombe, John R.
Wilsher, Sandra
Silva, Elisa S. M.
Sala Ayala, Laura
Cuervo-Arango Lecina, Juan
Materias: Cuerpo lúteoCorpus luteumCaballosHorsesEmbarazoPregnancyProgesteronaProgesteroneGenética animalAnimal genetics
Editorial : Elsevier
Citación : Newcombe, J.R., Wilsher, S., Silva, E.S.M., Sala-Ayala, L. & Cuervo-Arango, J. (2023). Seasonal absence of supplementary corpora lutea in pregnant mares and the relationship with pregnancy loss. Journal of Equine Veterinary Science, vol. 131 (dec.), art. 104960. DOI: https://doi.org/10.1016/j.jevs.2023.104960
Resumen : 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.
URI : http://hdl.handle.net/10637/15905
Derechos: http://creativecommons.org/licenses/by/4.0/deed.es
Open Access
ISSN : 0737-0806
1542-7412 (Electrónico)
Cubierto por: Acuerdo Transformativo – 2023
Fecha de publicación : dic-2023
Centro : Universidad Cardenal Herrera-CEU
Aparece en las colecciones: Dpto. Medicina y Cirugía Animal





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