Indian Journal of Animal Research

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Indian Journal of Animal Research, volume 38 issue 1 (january to june 2004) : 50 - 52

REPRODUCTIVE PERFORMANCES OF CRESTAR AND PMSG ADMINISTERED TO POSTPARTUM ANOESTRUS COWS

H.C. Nath, D.J. Dutta, A. Dutta, R.K. Biswas
1Department of Animal Physiology, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati - 781022, India

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Cite article:- Nath H.C., Dutta D.J., Dutta A., Biswas R.K. (2024). REPRODUCTIVE PERFORMANCES OF CRESTAR AND PMSG ADMINISTERED TO POSTPARTUM ANOESTRUS COWS. Indian Journal of Animal Research. 38(1): 50 - 52. doi: .

ABSTRACT

The reproductive activities like oestrus, conception and cyclicity in postpartum anoestrus cows following Crestar ear implant and PMSG injecfion were studied. Out of 10 postpartum anoestrus cows, 9 exhibited oestrus 30.81±1.43 hours after Crestar ear implant was removed after 9 days with PMSG injection @ 300 1U on the day of implant removal. The duration of induced oestrus was 19.11±0.34 hours. All oestrus cows had ovulated. Five out of 9 cows conceived at induced oestrus. Four animals which did not conceive, exhibited first natural oestrus after 20.8±3.61 days. Out of these four cows, only three conceived. The remaining one cow resumed normal cyclicity.The animals completed their term on an average 280.44±2.35 days after insemination. The mean birth weight of calf was 10.56±1.32 kg with male and female ratio of 1:3

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