New Delhi, Nov. 12 -- Leading dairy brands Amul and Mother Dairy have hiked milk prices by Rs.2-4 per litre, effective Thursday, due to higher input costs, including higher farmer procurement rates and increased fuel expenses. Gujarat Cooperative Milk Marketing Federation (GCMMF), which sells milk under the Amul brand, and Mother Dairy last increased retail milk prices in May this year. The price is being hiked due to a steep rise in input costs of milk production and processing, GCMMF said in a statement.P8...