Initially, Welisara farm was managed by the Department of Animal Production & Health and subsequently, it has been taken over by National Livestock Development Board in 1992. The expansion and improvement programs were funded by an Asian Development Bank project. This farm is situated 2 km off Mahabage Junction on Mahabage-Ragama road.

This was the only Government owned pig nucleus breeding farm in Sri Lanka, and maintained pure lines of Land Race, Large White and Duroc breeds. The breeding materials are supplied to the registered multiplier and commercial pig farmers from this nucleus breeding farm. In 2016, this farm was transferred to Martin farm and converted as the Milk Distribution and Processing Unit of NLDB.

To distribute milk and milk products of NLDB for owned milk outlets, sale centers and franchised shops

To maintain milk processing plant efficiently