Abstract—The objective of this study was to evaluate the efficiency of an intermediate dose of MGA on the inhibition of ovulation. Twenty empty and cycling ewes were used, with a corporal condition of 3.2 ± 0.3 (scale 1-5), 40.18 ± 5.8 kg and 3.25 ± 0.6 years old. The intermediate dose consisted of 0.22 mg of MGA per ewe during 17 days. In the dosing period ovarian activity was observed by echography, to observe the effect on the inhibition of ovulation. It was found that the intermediate dose of 0.22 mg, had a suppressive effect on ovulation in 100% of the ewes, which was observed in follicular dynamics expressed in 2 and 3 follicular waves. Concluded that the intermediate dose of 0.22 mg of MGA is efficient in its main effect, the suppression of ovulation.

Index Terms—Intermediate dose, efficiency, ovarian activity, echography.

Guillermo Salas-Razo, Jesús Antonio Rojo-Martínez, and Rogelio Garcidueñas-Piña are with the Universidad Michoacana de San Nicolás de Hidalgo, México (e-mail: gsalas55@hotmail.com, jesus.red@hotmail.com).
José Luis Espinoza-Villavicencio is with the Universidad Autónoma de Baja California Sur, México.

 

Cite: Guillermo Salas-Razo, Jesús Antonio Rojo-Martínez, Rogelio Garcidueñas-Piña, and José Luis Espinoza-Villavicencio, "Effect of an Intermediate Dose of Melengestrol Acetate (MGA) on Ovulation Inhibition in Ewes," International Journal of Bioscience, Biochemistry and Bioinformatics vol. 4, no. 3, pp. 171-174, 2014.