Abstract
Superovulatory response and embryo production efficacy were investigated in adult (age 2–4 years, average body weight: 27–43 kg) cycling Jakhrana goats (n = 15) under semi-arid environmental conditions of India by administering different superovulatory regimens. Goats were reared under semi-intensive system of management in established farm conditions. To synchronize oestrus, a luteolytic dose of carboprost tromethamine (Upjohn, UK) was administered intramuscularly to all does at the dose rate of 5μg per kg body weight in a double dose schedule with an interval of 11 days. For superovulation, 750 IU of PMSG (Folligon, Intervet, Boxmeer, Holland) per goat was administered intramuscularly 24 h before administering a second dose of luteolytic agent in five does (treatment 1). FSH (Sigma, St. Louis, MO, USA) 12.50 IU per goat was administered intramuscularly in a decreasing daily dose schedule (2.50, 2.50; 1.875, 1.875; 1.25, 1.25; 0.625, 0.625) at 12 h intervals over four days, initiated 48 h before administering second dose of carboprost tromethamine in 5 does (treatment 2). FSH (Super-Ov, Ausa Intern, USA) was administered at a uniform dose rate of 8.33 units per goat intramuscularly at 24 h intervals over three consecutive days (total dose was 25 units), initiated 48 h before administering a second dose of carboprost tromethamine in 5 does (treatment 3). To synchronize ovulation in responders, human chorionic gonadotrophin (hCG, Chorulon, Intervet) was injected intramuscularly at a dose rate of 500 IU in each goat on the day of oestrus appearance. Goats were laparotomized 72–82 h following the onset of synchronized oestrus and their genitalia were flushed using a standard collection procedure. Variability (p > 0.05) in superovulatory response (number of established corpora lutea) was observed: FSH (Sigma), 11.8± 2.9; FSH (Super-Ov), 11.6±4.5; PMSG (Intervet), 8.4±2.3. A similar pattern was reflected in mean embryo and transferable embryo recovery, respectively (p > 0.05): FSH (Sigma), 8.0±1.8, 5.2±1.7; FSH (Super-Ov), 6.6±2.4, 5.4±2.4; PMSG, 5.8±1.9, 3.8±2.2. In PMSG-treated does, comparatively more unfertilized ova or retarded embryos were recovered than in FSH-treated does. The superiority of FSH preparations over PMSG was reflected in terms of total and transferable embryo production (p > 0.05). On average, five transferable embryos (excellent and good quality) were recovered per doe treated with FSH of either source. The mean ova/embryo recovery was satisfactory (55–68%). Results indicated that Jakhrana goats can be superovulated for embryo production using FSH of either source to augment productivity.
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Abbreviations
- FSH:
-
follicle-stimulating hormone
- PMSG:
-
pregnant mare's serum gonadotrophin
- IU:
-
international unit
- hCG:
-
human chorionic gonadotrophin
- i.m.:
-
intramuscular(ly)
- i.v.:
-
intravenous(ly)
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Goel, A.K., Agrawal, K.P. Ovulatory Response and Embryo Yield in Jakhrana Goats Following Treatments with PMSG and FSH. Trop Anim Health Prod 37, 549–558 (2005). https://doi.org/10.1007/s11250-005-4223-1
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DOI: https://doi.org/10.1007/s11250-005-4223-1