| Sumario: | Estrus synchronization of 21 ewes was carried out using intravaginal sponges (60 mg of
medroxyprogesterone acetate, Sincrogest®-Sanfer, Mexico) for 14 days. 7 ewes were randomly
assigned to one of the three treatments: T1, 80 mg; T2, 120 mg; T3, 140 mg of porcine follicle stimulating
(pFSH) (Folltropin-p®-Bioniche, Canada) administered on day 12 after sponge insertion. The dose was
divided in decreasing doses; second and third day representing 50 to 75% and 25 to 33% of the first day
dose, respectively. At the beginning of superovulation treatment, each ewe received 5 mg of dinoprost
tromethamine (1 ml of Lutalyse® Pfizer, Mexico). An effect of pFSH level was observed on the interval
from sponge removal and the onset of estrus (REI) (P < 0.01), with a difference of 13.5 h between ewes
from treatment 2 and 3. The number of follicles (F), number of collected embryos (CE) and transferable
embryos (TE) (P < 0.05) was also different among treatments, with highest values observed in T3 (3.0 ±
0.6 for CE and 2.3 ± 0.5 for TE). Embryo recovery rate was in average 66.5%, (P > 0.05) of CL observed.
Further investigation is guaranteed to evaluate the effect of pFSH doses on estrus synchronization for
selected breeding seasons
|
|---|
