Estrus synchronization in dairy cows by treating with synchromate B
1988
Samphan Singhachan | Wanchai Klabvihok (Ratchaburi A.I. Research Center, Ratchaburi (Thailand)) | Panpilai Sekasiddhi
Oestrous synchronization in postpartum dairy cows was induced by synchromate-B (SMB). The SMB treatment consisted of an ear implant containing 6 mg norgestomet and an intramuscular injection containing 3 mg norgestomet and 6 mg estradiol valerate given at the time of implantation. After 9 days, implants were removed, estrous sign was detected and the cows were inseminated. Conception rates of the first, second, third, forth and fifth insemination in the group of SMB treated (n = 40) were 27.50 %, 40.74 %, 23.08 %, 44.44 % and 40.44 %, respectively, compared to 20.83 %, 33.33 %, 28.57 %, 7.14 % and 30.77 % in a control group of untreated mates (n = 48), respectively. Conception rates in each insemination in SMB group were not significantly different (P0.05). Side and after effects of SMB were also studied. After implant removal for 2-3 days, all SMB treated cows showed strong heat which indicated the optimum time for insemination. No lost of implants was detected. The nonconceived treated cows that return heat in the normal range (18-28 days) were 42.31 %.
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