ARTÍCULO
MOET efficiency in a spanish herd of japanese black heifers and analysis of environmental and metabolic determinants
Fecha
2022Registro en:
2079-7737
10.3390/biology11020225
Autor
Astiz, Susana
Fernández Novo, Aitor
Pesantez Pacheco, Jose Luis
Pérez Villalobos, Natividad
Bonet Bo, Martín
Sebastián, Francisco
Pérez Garnelo, Sonia Salomé
Martínez Bello, Daniel
Villagrá García, Arantxa
Gardón J., Juan Carlos
Vazquez Mosquera, Juan Mesias
Mercado, Eduardo de
Pérez Solana, María Luz
Institución
Resumen
Multiple ovulation and embryo transfer (MOET) systems have been intensively imple-mented in Japanese Black cattle in Japan and to create Japanese Black herds out of these areas. Environmental conditions influence MOET efficiency. Thus, we describe results of 137 in vivo, non-surgical embryo flushings performed between 2016–2020, in a full-blood Japanese Black herd kept in Spain and the possible effects of heat, year, bull, donor genetic value, and metabolic condition. Additionally, 687 embryo transfers were studied for conception rate (CR) and recipient related fac-tors. A total of 71.3% of viable embryos (724/1015) were obtained (5.3 ± 4.34/flushing). Donor metabolites did not affect embryo production (p > 0.1), although metabolite differences were observed over the years, and by flushing order, probably related to the donor age. CR was not affected by embryo type (fresh vs. frozen), recipient breed, and whether suckling or not suckling (p > 0.1). CR decreased significantly with heat (44.3 vs. 49.2%; (p = 0.042)) and numerically increased with recipient parity and ET-number. Pregnant recipients showed significantly higher levels of choles-terol-related metabolites, glucose, and urea (p < 0.05). Therefore, adequate MOET efficiency can be achieved under these conditions, and heat stress should be strongly avoided during Japanese Black embryo transfers. Moreover, recipients’ metabolites are important to achieve pregnancy, being probably related to better nutrient availability during pregnancy.