Effect of dietary regimens on ovarian response and embryo production of sheep in tropics
2002
Naqvi, S.M.K. | Gulyani, R. | Joshi, A. | Das, G.K. | Mittal, J.P.
Bharat Merino ewes (n = 24) maintained in a tropical environment were allocated to three dietary treatment groups. The ewes were grazed on pasture either without supplementation (Group 1) and with supplementation of concentrate feed at the rate of 150 g per ewe per day (Group 2) or 300 g per ewe per day (Group 3), respectively. Estrus was synchronized with two injections of prostaglandin (PGF2alpha) 10 mg at 10 days interval. Superovulation treatment commenced 3 days prior to the second injection of PGF2alpha. Each ewe received a total dose of 5.4 mg FSH every 12 h over 4 days and PMSG (200 IU) once at the start of the treatment. The ewes in estrus were exposed to fertile rams. Ovarian examination and recovery of embryos and ova were based on laparoscopy and laparotomy between days 3 and 6 after mating. Data for onset of estrus, duration of estrus, number of corpora lutea (CL), number of unovulated large follicles (LF), embryo recovery rate, embryo quality and fertilization were recorded. Onset of estrus after the second dose of PGF2alpha and duration of estrus did not differ significantly among the three groups. Number of ovulations, ovarian response (CL + LF), embryo recovery and yield of transferable embryos for all the dietary treatment groups were similar (P > 0.05). It is concluded that the dietary flushing of Bharat Merino ewes prior to superovulation and mating did not influence the estrus response, superovulatory response, embryo recovery or yield of transferable embryos.
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