Research and development of feed and feeding for frogs(Thai)

Abstract

This investigation was carried out in Khon Kaen Province, Northeast Thailand from October 2003 to September 2004. The experiment was made using a randomized complete block design with 3 replications. Ninety frogs (Rana rugulosa) of age three weeks were used. Each replication had 30 frogs. Frog feed with four protein levels were used, i.e. 25%, 30%, 35%, and 40 % and each was used as a treatment. The results showed that at four months after feeding started, mean average liveweights of frogs were 85.55 + 0.070 g, 132.77 + 2.719 g , 134.53 + 5.990 g and 113.93 + 0.090 g for 25%, 30%, 35% and 40 % protein treatments respectively. Mean average livelengths of frogs were 10.31 + 0.077 cm, 12.28 + 0.053 cm, 12.43 + 0.080 cm and 12.17 + 0.133 cm for the four protein levels, respectively. Mortality rates were 27.43 + 0.463%, 49.32 + 2.384%, 42.03 + 0.347% and 29.78 + 0.156% for the four protein levels, respectively. Feed conversion rates were 2.48 + 0.089%, 1.65 + 0.072%, 1.88 + 0.042% and 1.63 + 0.060% for the four protein levels, respectively. Gonadosomatic indices for male were 0.044 + 0.062, 0.436 + 0.071, 0.163 + 0.023 and 0.091 + 0.015 % and for female were 0.037 0.012, 0.124 + 0.023, 0.374 + 0.008 and 0.392 + 0.012 % for the four protein levels, respectively. Specific Growth Rate (SGR) per month were 2.090, 2.454, 2.468 and 2.326 for the 25%, 30%, 35% and 40 % protein treatments, respectively. SGR per day were 0.070, 0.082, 0.082 and 0.078 for the four protein levels, respectively. Proximate composition of frog carcasses were : moisture 43.3-73.8 g, protien 14.8-35.5 g, fat 6.2-21.6 g, ash 0.9-1.9 g, total nitrogen 2.4-5.7 g, protein nitrogen 2.4-6.1% and non-protien nitrogen 7-29%.