Answer : 1. "1975 "
Explanation :

1. Dairy development was initiated by the state government in the early seventies under the aegis of Rajasthan State Dairy Development Corporation (RSDDC), registered in 1975. Two years later the RCDF took over responsibility for many of the RSDDC's functions.

2. It has become the nodal agency for the implementation of Operation Flood in the state.

3. The Rajasthan Cooperative Dairy Federation (RCDF), established in 1977 as the implementing agency for dairy development programs in Rajasthan, is registered as a Society under the Rajasthan Cooperative Societies Act 196.