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 | Acceso al texto completo restringido a Biblioteca INIA La Estanzuela. Por información adicional contacte bib_le@inia.org.uy. |
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Biblioteca (s) : |
INIA La Estanzuela. |
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Fecha : |
21/02/2014 |
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Actualizado : |
08/10/2019 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
VIÑOLES, C.; FORSBERG, M.; BANCHERO, G.; RUBIANES, E. |
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Afiliación : |
CAROLINA VIÑOLES GIL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; Center for Reproductive Biology, Dept. of Clinical Chemistry, Swedish University of Agricultural Sciences, Uppsala, Sweden.; GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; EDGARDO RUBIANES, Dept. of Physiology, Faculty of Veterinary Medicine, Lasplaces 1550, Montevideo, Uruguay. |
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Título : |
Effect of long-term and short-term progestagen treatment on follicular development and pregnancy rate in cyclic ewes. |
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Fecha de publicación : |
2001 |
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Fuente / Imprenta : |
Theriogenology, 1 March 2001, Volume 55, Issue 4, Pages 993-1004 |
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DOI : |
10.1016/S0093-691X(01)00460-5 |
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Idioma : |
Inglés |
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Notas : |
Article history:Received for publication: September 28, 1999/ Accepted: May 1, 2000. |
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Contenido : |
Abstract.
The aim of this study was to evaluate the effect of the length of a progestagen treatment (12 d vs. 6 d) on follicular dynamics, estrus synchronization and pregnancy rate using medroxyprogesterone acetate (MAP) with or without an eCG dose at the end of MAP treatment. One hundred sixty Polwarth ewes were divided into four equal groups: long-term treated (LT, n=40); short-term treated (ST, n=40); long-term treated plus eCG (LTeCG, n=40); and short-term treated plus eCG (STeCG, n=40). Five ewes of each group were separated to undergo daily transrectal ultrasonography, and blood samples were taken for hormone determination. Until 96 h after sponge withdrawal the number of ewes in estrus was higher in both long-term-treated groups than in both short-term-treated groups but at the end of the observational period (144 h) no significant differences were found among groups. The pregnancy rate was higher in the ST group (87%) than in the other groups (LT, 63%; LTeCG, 67%; and STeCG, 58%; P< or =0.03). The ovulatory follicle emerged before sponge withdrawal in long-term-treated ewes (-3.8+/-0.4 d and -2.2+/-0.8 d for LT and LTeCG, respectively), whereas in short-term-treated ewes it emerges around sponge removal (0.4+/-1.1 d and 0.5+/-0.5 d for ST and STeCG, respectively; P< or =0.01). The ovulatory follicle in the LT group had a longer lifespan and attained a larger (P< or =0.05) maximum diameter than in the ST group. We conclude: a) that the lower pregnancy rate observed after long-term progestagen treatment was related to a slower follicular turnover that promoted the ovulation of persistent dominant follicles; (b) that short-term treatment resulted in a higher pregnancy rate probably due to the ovulation of newly recruited growing follicles; and (c) treatment with eCG had no advantage in association with long-term treatment and had a deleterious effect in combination with short-term treatment with MAP MenosAbstract.
The aim of this study was to evaluate the effect of the length of a progestagen treatment (12 d vs. 6 d) on follicular dynamics, estrus synchronization and pregnancy rate using medroxyprogesterone acetate (MAP) with or without an eCG dose at the end of MAP treatment. One hundred sixty Polwarth ewes were divided into four equal groups: long-term treated (LT, n=40); short-term treated (ST, n=40); long-term treated plus eCG (LTeCG, n=40); and short-term treated plus eCG (STeCG, n=40). Five ewes of each group were separated to undergo daily transrectal ultrasonography, and blood samples were taken for hormone determination. Until 96 h after sponge withdrawal the number of ewes in estrus was higher in both long-term-treated groups than in both short-term-treated groups but at the end of the observational period (144 h) no significant differences were found among groups. The pregnancy rate was higher in the ST group (87%) than in the other groups (LT, 63%; LTeCG, 67%; and STeCG, 58%; P< or =0.03). The ovulatory follicle emerged before sponge withdrawal in long-term-treated ewes (-3.8+/-0.4 d and -2.2+/-0.8 d for LT and LTeCG, respectively), whereas in short-term-treated ewes it emerges around sponge removal (0.4+/-1.1 d and 0.5+/-0.5 d for ST and STeCG, respectively; P< or =0.01). The ovulatory follicle in the LT group had a longer lifespan and attained a larger (P< or =0.05) maximum diameter than in the ST group. We conclude: a) that the lower pregnancy rate observed af... Presentar Todo |
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Palabras claves : |
EWES; FERTILITY; OVARIAN DYNAMICS; PREÑEZ EN OVEJA; PROGESTAGEN; ULTRASONOGRAPHY. |
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Asunto categoría : |
L53 Fisiología Animal - Reproducción |
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Marc : |
LEADER 02753naa a2200253 a 4500
001 1049494
005 2019-10-08
008 2001 bl uuuu u00u1 u #d
024 7 $a10.1016/S0093-691X(01)00460-5$2DOI
100 1 $aVIÑOLES, C.
245 $aEffect of long-term and short-term progestagen treatment on follicular development and pregnancy rate in cyclic ewes.
260 $c2001
500 $aArticle history:Received for publication: September 28, 1999/ Accepted: May 1, 2000.
520 $aAbstract. The aim of this study was to evaluate the effect of the length of a progestagen treatment (12 d vs. 6 d) on follicular dynamics, estrus synchronization and pregnancy rate using medroxyprogesterone acetate (MAP) with or without an eCG dose at the end of MAP treatment. One hundred sixty Polwarth ewes were divided into four equal groups: long-term treated (LT, n=40); short-term treated (ST, n=40); long-term treated plus eCG (LTeCG, n=40); and short-term treated plus eCG (STeCG, n=40). Five ewes of each group were separated to undergo daily transrectal ultrasonography, and blood samples were taken for hormone determination. Until 96 h after sponge withdrawal the number of ewes in estrus was higher in both long-term-treated groups than in both short-term-treated groups but at the end of the observational period (144 h) no significant differences were found among groups. The pregnancy rate was higher in the ST group (87%) than in the other groups (LT, 63%; LTeCG, 67%; and STeCG, 58%; P< or =0.03). The ovulatory follicle emerged before sponge withdrawal in long-term-treated ewes (-3.8+/-0.4 d and -2.2+/-0.8 d for LT and LTeCG, respectively), whereas in short-term-treated ewes it emerges around sponge removal (0.4+/-1.1 d and 0.5+/-0.5 d for ST and STeCG, respectively; P< or =0.01). The ovulatory follicle in the LT group had a longer lifespan and attained a larger (P< or =0.05) maximum diameter than in the ST group. We conclude: a) that the lower pregnancy rate observed after long-term progestagen treatment was related to a slower follicular turnover that promoted the ovulation of persistent dominant follicles; (b) that short-term treatment resulted in a higher pregnancy rate probably due to the ovulation of newly recruited growing follicles; and (c) treatment with eCG had no advantage in association with long-term treatment and had a deleterious effect in combination with short-term treatment with MAP
653 $aEWES
653 $aFERTILITY
653 $aOVARIAN DYNAMICS
653 $aPREÑEZ EN OVEJA
653 $aPROGESTAGEN
653 $aULTRASONOGRAPHY
700 1 $aFORSBERG, M.
700 1 $aBANCHERO, G.
700 1 $aRUBIANES, E.
773 $tTheriogenology, 1 March 2001, Volume 55, Issue 4, Pages 993-1004
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| 1. |  | HECKER, Y. P.; BURUCÚA, M. M.; FIORANI, F.; MALDONADO RIVERA, J. E.; CIRONE, K.M.; DORSCH, M.; CHEUQUEPÁN, F. A.; CAMPERO, L. M.; CANTÓN, G. J.; MARÍN, M. S.; ORTEGA-MORA, L. M.; MOORE, D. P. Reactivation and foetal infection in pregnant heifers infected with Neospora caninum live tachyzoites at prepubertal age. Vaccines, 2022, Volume 10, Issue 8, article 1175. OPEN ACCESS. doi: https://doi.org/10.3390/vaccines10081175 Article history: Received 5 July 2022; Revised 14 July 2022; Accepted 22 July 2022; Published 25 July 2022.
Corresponding author: Hecker, Y.P.; Instituto de Innovación para la Producción Agropecuaria y el Desarrollo Sostenible (IPADS),...| Tipo: Artículos en Revistas Indexadas Internacionales | Circulación / Nivel : Internacional - -- |
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