Answer : 4. "2012"
Explanation :

1. Animal husbandry plays an important role in the rural economy of Rajasthan and also has a significant impact in employment generation for marginal, sub-marginal and landless farmers.

2. With the same concept and in view of the expected success of the Chief Minister Free Medicine Scheme, with a view to providing free of cost the most commonly used essential medicines for the treatment of livestock of the state in all the government veterinary hospitals, "Chief Minister Livestock Free Medicine Scheme" 15 Has been started from August 2012.

3. Chief Minister Milk Producer Sambal Yojana - Now the state government will provide a subsidy at the rate of Rs 2 per litre to the cattle farmers supplying milk to the cooperative milk producer unions of the state.