View Item
- xmlui.general.dspace_homeCentros Regionales y EEAsCentro Regional Patagonia SurEEA ChubutArtículos científicosxmlui.ArtifactBrowser.ItemViewer.trail
- DSpace Home
- Centros Regionales y EEAs
- Centro Regional Patagonia Sur
- EEA Chubut
- Artículos científicos
- View Item
The effect of melatonin and season on in vivo embryo production of Dohne Merino ewes
Abstract
To determine the effect of melatonin on embryo production in superovulated donor Dohne Merino ewes, two experiments were carried out at Trelew, Argentina (43° S 65° W), during the breeding and the anestrous seasons. Twenty-two ewes were used in experiment 1 (breeding season). Animals were divided into two groups: group M (melatonin, n = 11) received a melatonin implant 48 days before superovulatory treatment, and C (control, n = 11), non-treated. Two
[ver mas...]
To determine the effect of melatonin on embryo production in superovulated donor Dohne Merino ewes, two experiments were carried out at Trelew, Argentina (43° S 65° W), during the breeding and the anestrous seasons. Twenty-two ewes were used in experiment 1 (breeding season). Animals were divided into two groups: group M (melatonin, n = 11) received a melatonin implant 48 days before superovulatory treatment, and C (control, n = 11), non-treated. Two intrauterine artificial inseminations were performed 33 and 48 h after sponge removal. Embryos were collected 7 days after the onset of oestrus (58 days after the onset of melatonin treatments). Twelve ewes of the same breed were used in experiment 2, which was carried out during the anestrus season, under the same experimental procedures (group M, n = 6; group C, n = 6). Treated ewes presented a significant delay in the onset of oestrus during the breeding season (M: 31.10 ± 1.04; C: 25.20 ± 0.98 h; p < 0.05). Melatonin induced a significant reduction in the number of degenerated embryos per ewe during seasonal anestrus (M: 0.60 ± 1.74; C: 3.00 ± 1.74; p < 0.05). No differences between groups and seasons were observed for ovulation, fertilization and viability rates, and the number of viable embryos per ewe. In conclusion, our results indicate that the use of melatonin to improve embryo production in MOET sheep programs in the Dohne Merino breed at 43° S does not improve fertility and embryo viability. Although, a reduction of the number of degenerated embryos during the anestrous season was observed in the treated group.
[Cerrar]
![Thumbnail](/xmlui/bitstream/handle/20.500.12123/2785/SmallRuminantResearch-cover.gif?sequence=3&isAllowed=y)
Author
Fuente
Small Ruminant Research 120 (1) : 121-124 (July 2014)
Date
2014-07
ISSN
0921-4488
Formato
pdf
Tipo de documento
artículo
Palabras Claves
Derechos de acceso
Restringido
![](../../themes/Mirage2/images/cc-by-nc-sa.png)