Superovulatory response and embryo production efficiency in goats following pretreatment with heG and estradiol-178
2008
Kharche, S. D. | Majumdar, A. C. | Tyagi, S. | Sharma, G Taru
The yield of transferable embryos following superovulation were investigated in adult (age 2-4 years; body weight 2S-3S kg) cycling goats (48) under semi arid environmental conditions of the India, by administering different superovulatory regimens. Goats were reared under intensive system of management in established farm conditions. Cyclic goats received decreasing doses of total 20IU FSH over 3 days (4+4, 3+3, 3+3 IU). The prostaglandin FzCx (1.2Sml) was administered ilm at 60h after the first FSH injection. Four different pretreatments were carried out (groups 2-S). Pretreatment (groups) consisted of (2) SOO IU hCG ilm and 1 mg estradiol-17B sIc for the next 2 days, (3) SOO IU hCG ilm and$ h later 2 mg estradiol-17B sIc, (4) as (3) but with 1 mg estradiol-17B sIc, and (S) as (4) but with 2S0 IU hCG i/m. Goats were observed for the onset of oestrus with an aproned buck twice a day at 12h interval. The animals of group I and 2 were administered SOO IU hCG ilm at the synchronized estrus, numbers of visible corpora lutea (CL) and large unovulated follicles were counted and their genitalia were flushed using a standard collection procedure. The mean number of total and transferable embryo recovery in groups I-S were statistically significant indicating that pretreatment with low doses of hCG and estradiol-17B may enhance superovulatory response in goats with regard to yield of total and transferable embryos.
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