engleski

Effect of eCG and Progestagen on Ovarian Follicle Population in Goats

The aim of present study was to evaluate the response of ovarian follicle population to eCG/progestagen treatment in goats. In second half of February, 7 Serrana goats (G-eCG) received 250 u.i. of eCG at the removal of intravaginal sponges impregnated with 20mg of flugestone acetate and kept in place during 6 days. 6 other Serrana goats (G-C) remained untreated as controls. Ovarian transrectal ultrasonographic examinations were performed in both groups at 0, 20, 42, 72 and 92 h after eCG administration in G-eCG. Follicles were counted and classified according to the following classes: total follicles, <3, >=3, 3-5 and >=5 mmin diameter. At 0 h, no differences between groups were found in any class of follicles. However, an increase of total follicles between 0 h (7.1) and 72 h (9.9) or 92 h (10.3) was observed in G-eCG, but not in G-C. Also, in G-eCG, the number of 3-5 follicles class increased from 0 h (1, 7) to 42 h (3.8) followed by a decrease at 72 h and remained constant at 92 h (2, 3), variations not observed in G-C. In >5 class, the number of follicles remained constant (1, 2) in all examinations, without differences between groups. The number of follicles <3 mm was constant in both groups until 42 h (4, 7) but increased at 92 h (7, 1) in G-eCG. These results suggest that low dose of eCG stimulate the number of 3-5 mm follicles present in ovaries but not small (<3 class) follicles.

eCG; progestagen; follicle population; goats

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