The present study was conducted to assess the effect of vitamin C (ascorbic acid), vitamin E, organic chromium and its combination on growth performance and economics of Narmadanidhi birds in winter season. A total of 240, day-old coloured dual type Narmadanidhi chicks were distributed into 12 dietary treatment groups with each consisting 20 chicks in 2 replicates. The chicks were housed in individual pens as per treatment groups and reared on litter system. Dietary treatment supplements in starter and finisher ration were C0 control, C1 (150 mg AA/kg), C2 (250 mg AA/kg), E1 (125 mg vit-E/kg), E2 (200 mg vit-E/ kg) Cr1 (1.25 mg Cr-propionate/kg), Cr2 (2.0 mg Cr-Propionate/kg). Combined supplements were C2E1, C2E2, C2Cr1, C2Cr2, and C2E1Cr2. The data of body weight, feed intake, feed efficiency and economics of rearing were recorded and measured on 6th week interval. Analysis (One way ANOVA) was carried out to study the effect of treatments on production performance. At 12 week, body weights in combined supplement C2Cr2, C2E1Cr2 were significantly higher and non-significant from control. Combined supplements C2Cr2, C2E1Cr2 improved feed intake significantly than all other treatments.. Cumulative feed efficiency of E2, Cr1, Cr2, C2E2, C2Cr2 and C2E1Cr2 were non-significantly different and significantly better than control group. Treatment C2Cr2 has highest gross profit/bird and Cr1 has highest gross profit/kg live weight than control and all other treatment groups. Finally, concluded that combined supplement C2Cr2, C2E1Cr2 had superior performance and Cr1 had better economy in winter season with significantly better performance than control.

Highlights

• Combined supplementation of C2Cr2, C2E1Cr2 had superior performance on Narmadanidhi birds in winter season.
• Lower level of chromium Cr1 had better economy in winter season with significantly better performance.