AI Impact Study (2009/10)
Impact of AI on Milk Production
Though major impact of AI is its contribution in increment of milk productivity and production, no systematic study has been carried out in this regard yet. An attempt is made to project contribution of AI program in milk production on annual basis. The data for this projection are based on analysis of 98265 entries made by NLBC and LBOs last FY 2009/10 and from secondary sources and systematic study to find out actual contribution of AI needs to be taken up.
When we analyzed the AI data from different districts, the percentage of AI between cattle and buffalo was found to be 81 % and 19 % respectively, between local and crossbred buffalo was about 42 % and 58 %, and between local and crossbred cows 17 % and 83 %. So, for calculating the projected milk production, we have assumed accordingly. With the assumption that the average age at first calving is 3 years, the mortality rate is 10 %, the herd calving rate is 75 % for cattle and 60 % for Buffalo and the conception rate is 56.15 % in cattle and 46.76 % in buffalos (though the result from the above conception rate Table shows the combined conception rate of cattle and buffalo to be 51.15 %), number of female crossbreds produced through AI done in last year is estimated to be 23751. These female crossbreds after calving will produce 5371 Mt. more milk annually than they would produce with the use of average bull available in the locality. The following table will substantiate the impact of AI on milk production.
Contribution of AI in milk Production
Findings of a field study undertaken in Lekhanath of Kaski by an internee from IAAS, Rampur proved impact of AI in improving/maintaining productivity of non-descript and Jersey cattle respectively. It shows milk production of local cattle, which was 745 lit./lactation increased to 1967 lit./lactation in AI born F2. While per lactation milk production of Jersey which was 2790 liter increased to 3104 liter. The findings, though need further study are sure to refute the changes on AI of having negative impact in productivity. As the data clearly show about 300 times increment in productivity of crossbreds and almost constant productivity in purebreds which without AI would have decreased.