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Two on farm feeding trials were conducted at the Pabna milkshed area during July to October 1993, to evaluate the response of feeding urea molassesed straw (UMS) on milk production of Pabna milking cows and its economics. A feeding trial of 60 days with 50 Pabna milking cows showed that the cows fed UMS as a replacer of dry straw increased daily milk yield by 1.37 litre. Moreover, it reduced the daily requirement of concentrate by 1.0 kg/head. In the second trial, a herd of 52 animals including 14 milking cows were fed UMS in place of traditionally used dry straw. Introduction of UMS increased the milk production by 1.0 litre/cow/day and saved concentrate by 1.5 kg/cow daily. Urea molassesed straw can safely and economically be fed to lactating cows.