legales2011 1.indd
The aim of the present study was to evaluate the effect of a progesterone releasing intravaginal device plus the injection of PGF2? at removal and the application of hCG on day 5 after withdrawal on the ovarian activity in cyclic mares. Additionally, pregnancy rates were evaluated at the end of the...
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| Autores principales: | , , , , |
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| Formato: | Artículo publishedVersion |
| Lenguaje: | Español |
| Publicado: |
Universidad de Buenos Aires. Facultad de Ciencias Veterinarias.
2011
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| Materias: | |
| Acceso en línea: | http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=pveterinaria/invet&cl=CL1&d=HWA_3819 https://repositoriouba.sisbi.uba.ar/gsdl/collect/pveterinaria/invet/index/assoc/HWA_3819.dir/3819.PDF |
| Aporte de: |
| Sumario: | The aim of the present study was to evaluate the effect of a progesterone releasing intravaginal device plus the injection of PGF2? at removal and the application of hCG on day 5 after withdrawal on the ovarian activity in cyclic mares. Additionally, pregnancy rates were evaluated at the end of the study. Animals were divided into two groups: Treated with an intravaginal device containing 1.38 g progesterone during 8 days plus PGF2? at the removal time and an hCG injection to animals with a follicle with a diameter ? 30 mm on day 5 and controls (no treatment). Four days after removal, animals were mated. Plasma progesterone concentrations remained 2.1 ng ml-1 during the period that the devices were kept into the vagina. An ovulatory follicle between the device removal and hCG application was observed in 83.4% (25/30) of the treated animals: 68% (17/25) ovulated in response to hCG while 32% (8/25) ovulated spontaneously during the fi rst 4 days post device removal. In the control group, ovulations occurred randomly. On day 45, animals were ultrasonographed for pregnancy diagnosis. It was recorded a higher percentage of pregnant mares during the fi rst days post treatment in the T group although differences were not statistically signifi cant. In summary, the use of an intravaginal device containing progesterone in a protocol as presented in this study permit an important synchronization of the appearance of ovulatory follicles around day 5 after removal. \n |
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