Study of the factors affecting embryo yields and quality in superovulated Morada Nova ewes that underwent non-surgical uterine flushing.

Autor: Oliveira MEF; Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Jaboticabal, Brazil.; Embrapa Caprinos e Ovinos, Sobral, Brazil., Arrais AM; Departamento de Reprodução e Avaliação Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, Brazil., de Mello MRB; Departamento de Reprodução e Avaliação Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, Brazil., Vergani GB; Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, Jaboticabal, Brazil., Figueira LM; Faculdade de Veterinária, Universidade Federal Fluminense, Niterói, Brazil., Esteves SN; Embrapa Pecuária Sudeste, São Carlos, Brazil., Pereira VSDA; Embrapa Pecuária Sudeste, São Carlos, Brazil., Garcia AR; Embrapa Pecuária Sudeste, São Carlos, Brazil., Bartlewski PM; Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada., da Fonseca JF; Embrapa Caprinos e Ovinos, Sobral, Brazil.
Jazyk: angličtina
Zdroj: Reproduction in domestic animals = Zuchthygiene [Reprod Domest Anim] 2022 Apr; Vol. 57 (4), pp. 393-401. Date of Electronic Publication: 2022 Jan 17.
DOI: 10.1111/rda.14077
Abstrakt: The present study compared the outcomes of in vivo embryo production in Morada Nova ewes subjected to either 9-day (G-9 SOV , n = 21) or 12-day (G-12 SOV , n = 21) progesterone (P 4 )-based estruses synchronization protocol coupled with superovulatory treatment with decreasing doses of porcine follicle-stimulating hormone (133 mg of pFSH given over 3 days). Non-surgical embryo recovery (NSER) was performed 6-7 days after the onset of oestrus. Total antral follicle count doubled from the first to the sixth pFSH dose in both groups (p < .05). Oestrus responses did not vary between the two groups of animals (95.2%). Corpora lutea (CL) were detected in 85.0% and 60.0% of ewes that previously manifested oestrus behaviour in G-9 SOV and G-12 SOV respectively. NSER was successfully completed in 86.2% of ewes that had CL (p > .05). The mean number of CL per ewe/successfully flushed donor ewe was greater (p < .05) in G-12 SOV (12.3 ± 1.7/12.1 ± 1.9) than in G-9 SOV (7.9 ± 1.4/8.2 ± 1.6). Mean numbers of retrieved blastocysts and viable embryos were greater (p > .05) in G-12 SOV (5.8 ± 1.9 and 3.7 ± 1.7) than G-9 SOV (3.5 ± 1.1 and 0.8 ± 0.3 respectively). The total follicle count (all follicles ≥2 mm in diameter) at the sixth pFSH dose (at P 4 -device removal) was positively correlated (p < .05) with the number of CL (r = .95) and viable embryos (r = .91) in G-12 SOV . The ewes with ≥10 Cl (48% of all flushed donors) yielded 80.5% of viable embryos. In summary: (a) Morada Nova ewes from G-12 SOV group had better superovulatory responses compared with G-9 SOV group; (b) total follicle count at the last pFSH dose was a good predictor of superovulatory responses only in the ewes primed with P 4 for 12 days; and (c) animals with ≥10 ovulations are main contributors to viable embryo production in Morada Nova ewes.
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
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