Progesterone doses of 5, 3 or 1 mg do not prevent short ovulatory cycles in goats exposed to photo-stimulated bucks.

Autor: Andrade-Esparza JD; Centro de Investigación en Reproducción Caprina (CIRCA), Programa de Posgrado en Ciencias Agrarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico., Espinoza-Flores LA; Centro de Investigación en Reproducción Caprina (CIRCA), Programa de Posgrado en Ciencias Agrarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico., Hernández H; Centro de Investigación en Reproducción Caprina (CIRCA), Programa de Posgrado en Ciencias Agrarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico., Chemineau P; Physiologie de la Reproduction et des Comportements, CNRS, IFCE, INRA, Université de Tours, Agreenium, 37380, Nouzilly, France., Keller M; Physiologie de la Reproduction et des Comportements, CNRS, IFCE, INRA, Université de Tours, Agreenium, 37380, Nouzilly, France., Delgadillo JA; Centro de Investigación en Reproducción Caprina (CIRCA), Programa de Posgrado en Ciencias Agrarias, Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila, Mexico. Electronic address: joaldesa@yahoo.com.
Jazyk: angličtina
Zdroj: Theriogenology [Theriogenology] 2019 May; Vol. 130, pp. 36-40. Date of Electronic Publication: 2019 Mar 01.
DOI: 10.1016/j.theriogenology.2019.02.036
Abstrakt: The aim of this study was to determine whether lower doses than 25 mg of progesterone reduce the frequency of short ovulatory cycles in seasonal anestrous goats exposed to sexually active bucks. Females from the control group were given an im dose of 2 mL olive oil (n = 9). Females from the experimental groups were given an im dose of 1 mg (n = 15), 3 mg (n = 16), 5 mg (n = 15) or 25 mg (n = 16) of progesterone diluted in 2 mL olive oil, 48 h prior exposition to bucks (n = 1 per group). Males were daily switched among groups, and they remained with goats during 21 days. The proportion of goats that ovulated was high (≥87%), and was not different among groups (P > 0.05). In contrast, the proportion of goats that displayed short ovulatory cycles differed among groups (P < 0.05). Indeed, the proportion of goats displaying short ovulatory cycles was lower in those treated with 25 mg (12%) than in those from the control (78%), 1 mg (85%), 3 mg (50%), or 5 mg (71%) groups (P < 0.05), but there were no differences among these last four groups (P > 0.05). Finally, the percentage of kidding females (≥40%) and the number of kids born per female (≥1.4) did not differ among groups (P > 0.05). In conclusion, an im dose of 25 mg of progesterone was more effective than 5, 3 or 1 mg to avoid the short ovulatory cycles in seasonal anestrous goats exposed to the male effect.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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