Effect on growth performance and proximate composition of juveniles of Cirrhinus mrigala fed on varying levels of protein
Ritu Kumari, Roopma Gandotra
Present study was conducted to evaluate the impact of varying levels of dietary protein on the growth and proximate composition of the juveniles of Cirrhinus mrigala (0.228±0.002). Five iso-nitrogenous diets containing 25%, 30%, 35%, 40% and 45% protein was formulated and fed @ 5% of the body weight to the juveniles of Cirrhinus mrigala for the period of 90days. The results showed that growth performance in terms of weight gain (WG), specific growth rate (SGR), Food conversion ratio (FCR) and Food conversion efficiency (FCE) was best found in juveniles fed on 40% protein diet. It was observed that FCR reduced as dietary protein level increased while FCE increased with increase in the percentage of protein in the diet. The minimum FCR was found to be 14.48 at 40% protein diet and maximum was 81.3 at 25%. Also FCE was minimum i.e. 1.88 at 25% and maximum to be 6.8 at 40%. SGR was found to be 0.300, 0.391, 0.45, 0.833 and 0.547 in 25%, 30%, 35%, 40% and 45%. Proximate composition of body revealed that dietary protein significantly affect the body protein level. Juveniles fed on 40% protein diet obtain a significant (p<0.001) higher body protein as compared to other diets. Thus the present findings suggest that a practical diet having 40% protein provide sufficient nutrients and energy to support the acceptable growth in the juveniles of Cirrhinus mrigala.