| TAZ-TFM-2012-468 |
Uso de la combinación de melatonina y prostaglandinas para la sincronización del estro en ovejas de raza rasa aragonesa
Silva, Manuel Agustín
Abecia Martínez, Alfonso (dir.)
Universidad de Zaragoza,
VET,
2012
Producción Animal y Ciencia de los Alimentos department, Producción Animal area
Máster Universitario en Iniciación a la Investigación en Ciencias Veterinarias
Free keyword(s): ovino ; sincronización ; celos ; reproducción animal ; melatonina ; prostaglandinas
Tipo de Trabajo Académico: Trabajo Fin de Master
Notas: The goal of this work was to use exogenous melatonin in combination with PGF2α on spring, to study its efficacy in the oestrus sinchronization in sheep. Fifty-one female and 4 male Rasa Aragonesa sheep were included in the study. Ewes were divided in three experimental groups based on the treatment received. One group was treated with melatonin, another was treated with melatonin along with a single shot of PGF2α and the last one was the control group. Rams and ewes were kept apart until the end of their treatment and were put together for the breeding. Blood samples from the female were taken and processed to establish the concentration of progesterone, in order to know their reproductive status; these samples were collected seven days prior to the introduction of males, the day of the introduction and seven days after the introduction. Progesterone concentrations showed that 100% of the female sheep had a cyclical activity before the introduction of the male sheep. Ewes were in oestrus from the day of introduction of the male into the pen, and the group treated with PGF2α showed oestrous sinchronization the first days of breeding. On day 2, 41% of the individuals were in heat. The other two groups, the one treated with melatonin and the control group, showed a fast and growing sexual activity, which can be attributed to the fact that the female were already in cyclic stage and to a likely effect of “sympathy”. Regarding the pregnancy rate, it is worth noting that it was low (55%) and with no significant differences among the groups (59% for the group treated with prostaglandine and 53% in the other two). This was possibly due to the high number of sheep in heat in a short period of time which prevented the male sheep to mate all of them and the stress the animals were subjected throughout the whole experience. In conclusion, the combination of melatonin implants and a single shot of PGF2α in spring showed the capability of sinchronizing the oestrus in the group treated, although without reaching the usual figures of the traditional treated with PGF2α and double shots within 7-10 days.
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