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

Affiliations

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. (2025). 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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REPRODUCTIVE PERFORMANCES OF CRESTAR AND PMSG ADMINISTERED TO POSTPARTUM ANOESTRUS COWS

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