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Not AvailableAn experiment was conducted during rainy season at high altitude of Kumaun region to optimize dietary needs of protein (limiting amino acid profile) employing 216 day-old broiler chickens (CARIBRO Dhanraja) divided into 12 groups of 18 each, reared on deep litter. Three experimental regimens with three levels of limiting amino acids (LAA; 115, 100 and 85% of NRC) were formulated at fixed energy level of 3000 kcal ME/kg. The protein levels were 21.9 and 20.2% (LAA115), 19.2 and 17.6% (LAA100) and 16.2 and 14.9 (LAA85) during starting and finishing phases, respectively. Each diet was fed to 4 replicated groups. During different phases of growth, the gain in BW, feed intake and FCR improved (P<0.01) in diets having LAA at 115 and 100% NRC levels than control diet. The birds fed LAA100 or LAA115 had similar BW gain, feed intake and FCR. Lower (P<0.01) BW gain and poorer feed conversion was observed in LAA85. The alkaline phosphatase, triglyceride, corticosteron and thyroxine did not differ except plasma calcium and triiodothyronine, which were higher (P<0.01) at high LAA115. The edible meat yield and eviscerated yields were significantly (P