In order to determine the optimum protein requirement in the feeds for Catla catla (Hamilton) and Labeo rohita (Hamilton), isocaloric pelleted feeds containing 20.. 30.. 40 % and 45 %protein were formulated using casein as the main source of protein. The best growth of catla and rohu was observed when fed on feeds containing 30~~and 40 % protein. The growth was poorer when fed on the diet containing 20 %protein and poorest when fed on the feed containing 45 %protein. The results revealed that the protein requirement of both catla and rohu was around 30 % It also indicated that more than the optimum level of protein in feeds has an adverse effect on the growth of the species investigated.
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