Desarrollo folicular en ovejas durante el ciclo estral natural e inducido con prostaglandinas

• Main Author: Uribe-Velásquez, Luis Fernando
• Publication Date: 2010
• Other Authors: Oba, Eunice [UNESP], Souza, Maria Inês Lenz, Vélez-Marín, Miryam, Correa-Orozco, Adriana
• Format: Article
• Language: spa
• Source: Repositório Institucional da UNESP
• Download full: http://hdl.handle.net/11449/226172
• topic: Estrous; Follicles; Prostaglandins; Synchronization

The follicular development was evaluated in ovine females during natural and prostaglandin-F2α (PG) induced estrous cycle. Ewes were randomly divided in two treatments (n=7/treatment): T1 with natural cycle and T2 synchronized with two injections of PG. From one day before PG injection until next ovulation, daily transrectal ultrasonography was done. All follicles >2 mm were assessed. During the interovulatory intervals, follicular growth and regression occurred in a wave like pattern (2-3 waves). The maximum diameter of the largest follicle of the first wave was greater in T1 (5.83 ± 0.31 mm) compared with T2 (5.0 ±0.1 mm; P<0.01), but there was no significant difference among the emergency day of largest follicle, during the growth phase of the follicular waves. The duration of the plateau phase in wave 2 differed between the two treatments (P<0.05) showing 0.83 ± 0.31 and 1.83 ± 0.17 d, for natural and synchronized treatment, respectively. Growth rate did not differ between treatments. Presence of new luteal tissue was detected on day 3 after ovulation. In conclusion, the follicular development was similar in female ovine during natural and PG induced estrous cycle.