Effect of Protein Rate on the Growth, Feed Efficiency and Composition of Hoplobatrachus Occipitalis (Günther, 1858) Tadpoles’ Carcass in Controlled Medium

Abstract

The current study aims at evaluating the effect of experimental feed protein rate on growth and feed utilization in Hoplobatrachus occipitalis tadpoles. Six same-energy feed diets containing crescent protein rates (20, 30, 40, 45, 50 and 60 %) were formulated and tested on Hoplobatrachus occipitalis tadpoles though initial mean weight was 0.380 ± 0.004 g. Each diet was tested in triplicate for 24 days. 55 tadpoles was stocked per pond containing 30L water. Survival rates recorded ranged between 85.454 and 92.727% for all treatments. Growth and feed utilization parameters varied significantly with feed protein rate (P < 0.05). The best growth performances were recorded with 60% protein diet. According to the mathematical model (polynomial regression II) used for analysis of specific growth rate variations in relation to feed protein rate, optimal and maximal protein needs of Hoplobatrachus occipitalis tadpoles are 33 and 51% respectively. The highest protein rate of tadpoles' carcass was noticed in tadpoles fed on 45% protein diet. The highest rate of lipid and dry matter was observed in tadpoles fed on 50% protein feed. The optimum and maximum protein requirements for better growth of H. occipitalis tadpoles are 38.30% and 54.10%, respectively.

The effects of different stocking densities and feed types on frogs’ growth and survival rates (Rana tigerina Dubois, 1981) reared in composite tanks

“…In this study, the survival rates of frogs fed different feed types were 56.00-64.67%. This rate seemed lower than that in previous studies on frogs, mostly tadpoles (Sretarugsa et al, 1997;Olvera-Novoa et al, 2007;Mustapha & Bello, 2018;Godome et al, 2019). However, it should be noted that the results have depended on several factors, such as species, stocking density, and environmental conditions (Hafedh, 1999).…”

“…The protein content of the feed is significant for weight gain in frogs. According to studies on frog diets, the protein ratio suitable for tadpole and juvenile stage growth and development should be 40% (Carmona-Osalde et al, 1996;Olvera-Novoa et al, 2007;Godome et al, 2019). However, Browne (2009) discovered that proteins alone do not determine the growth performance of frogs under culture.…”

“…However, research on edible frog nutritional requirements is limited now, which poses many challenges in improving the culture of these frogs from the dietary perspective (Toledo et al, 2014). The nutritional composition of frog feed appropriate to each stage has been studied by several researchers (Sretarugsa et al, 1997;Mustapha and Bello, 2018;Godome et al, 2019), but studies that use commercially available feed remain scarce. This study evaluates the effects of different stocking densities, and types of feed on the growth and survival rates of the Thailand frog reared in composite tanks.…”

Vitamin C dietary supplementation influence tadpoles of bullfrog Lithobates catesbeianus reared in low water temperature

“…As an ectothermal animal, tadpoles kept under a high interval of thermal discomfort do not develop (Knoop et al, 2015;Godome et al, 2018), as this parameter directly influences food consumption caused by thermal stress, compromising the healthy development of these animals (Braga & Lima, 2001). This can be confirmed in the study by Hoffmann et al (1988), which observed that the tadpoles presented higher biomass and less time to complete metamorphosis when kept at elevated temperatures, with the ideal temperature around 25 ºC.…”