Abstract—The aim of this study was to evaluate whether prolonged treatment with acetate of melengestrol (MGA) influence or not, the ovarian follicular persistence in the ewe. We used 20 ewes with BCS 3.2 ± 0.3 (scale 1-5), 40.18 ± 5.8 kg BW and 3.25 ± 0.6 old years. All were confirmed by ultrasound, not pregnant. Treatment consisted of 0.22 mg of MGA daily during 17 days and follicular development was observed. The follicles were identified as an echogenic structures. The persistence or not follicular persistence was determined from changes in the size of dominant follicles in the days observed. During treatment, none of the ewes presented the dominant follicle persistent development. Is concluded that administration of prolonged treatment with MGA, not generates persistent follicle development in ewes.

Index Terms—Ewes, follicular persistence, melengestrol acetate.

Guillermo Salas-Razo, Jesús Antonio Rojo-Martínez, Rogelio Garcidueñas-Piña, Juan Pablo Flores-Padilla, and Mauricio Perea-Peña are with the Universidad Michoacana de San Nicolás de Hidalgo, Mich, México (e-mail:gsalas55@hotmail.com,jesus.red@hotmail.com,rgarcidu@yahoo.co m, pabloflop@hotmail.com, mapepe17@hotmail.com ).
José Luis Espinoza-Villavicencio is with the Universidad Autónoma de Baja California Sur, México (e-mail: jlvilla@uabcs.mx ) .

 

Cite:Guillermo Salas-Razo, Jesús Antonio Rojo-Martínez, Rogelio Garcidueñas-Piña, Juan Pablo Flores-Padilla, Mauricio Perea-Peña, and José Luis Espinoza-Villavicencio, "Effect of Prolonged Treatment with Melengestrol Acetate (MGA) on the Persistence or Non-Persistence of Ovarian Follicles in Ewes," International Journal of Bioscience, Biochemistry and Bioinformatics vol. 3, no. 4, pp. 298-300, 2013.