STUDIES ON PERSISTENCY OF LACTATION IN JERSEY, H.F. AND THEIR CROSSES WITH ASSAM LOCAL CATTLE

PURABI KAUSHIK¹*, D. DAS², S. LASKAR³, R.N. GOSWAMI^4
1Department of LFC (AGB), College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, 781022, India
²Department of LFC (AGB), College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, 781022, India
³Department of LFC (AGB), College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, 781022, India
⁴Department of LFC (AGB), College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, 781022, India
* Corresponding Author : purabiicar@gmail.com

Received : 25-07-2018     Accepted : 11-08-2018     Published : 15-08-2018
Volume : 10     Issue : 15       Pages : 6813 - 6814
Int J Agr Sci 10.15 (2018):6813-6814

Keywords : Persistency of milk yield, Jersey, H.F, Crossbreds, Local cattle
Conflict of Interest : None declared
Acknowledgements/Funding : Author is thankful to College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, 781022, India for providing me the necessary help to carry out the research works.
Author Contribution : All author equally contributed

The present study was conducted utilizing a total of 1474 lactations record pertaining to 497 nos of cows maintained in private farms of the areas covered under Intensive Cattle Development Programme of Kamrup, Marigaon and Nagaon district of Assam. The study involved seven genetic groups of cattle viz., Jersey x Local (50:50), Jersey x Local (75: 25), Jersey (Pure), Jersey x Holstein Friesians (50:50), Jersey x Holstein Friesians (75:25), Holstein Friesian x Local (50:50) and Assam local respectively. The least square means for persistency of first lactation were 0.90±0.005 days, 0.91±0.006 days. 0.92±0.005 days, 0.91±0.006 days, 0.90±0.01 days, 0.89±0.01days and 0.79±0.01 days in different genetic groups viz., G1, G2, G3, G4, G5, G6 and G7 respectively. The overall persistence of lactation (µ) for all the genetic groups were 0.89 ±0.01 days. The effect of season of calving on persistency of first lactation was non-significant. The least square means for persistency of first lactation were 0.89±0.005, 0.89±0.005, 0.88±0.005 and 0.89±0.006 days in S1( summer monsoon season), S2(south west monsoon season), S3( post monsoon season) and S4( winter season).

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