Desempenho e atividades enzimáticas em girinos de rã-touro

Abstract

Performance and enzymatic activities of the bullfrog tadpolesAbstract -The objective of this study was to evaluate the performance and the digestive enzyme activity in bullfrog tadpoles, fed with commercial ration during 60 days, at the density of one tadpole per liter in 30 L boxes. The parameters measured fortnightly were: survival, length, weight, ration consumption, and amylase, lipase and trypsin activities. There larger growth of the tadpoles occurred from the 15 th to the 45 th day -20.61 mm. During the first 15 days, the tadpoles had the largest specific growth rate, 16.7% per day. From the 45 th to the 60 th day, the tadpoles had the largest weight gain, 3.98±0.73 g, the largest ration consumption, 14.40±1.14 g and the best feed conversion, 3.67:1.0±0.18. There was significant increase in enzyme activities after the 30 th day. Relationships were observed between the specific enzyme activities and the different development phases of the tadpoles.

Effect of Two Levels of Temperature and Natural and Artificial Photoperiod on Growth and Metamorphosis of Bullfrog Tadpoles in an Intensive Rearing System

“…For length, the K m values from the logistic model (Figure 4) were 50.21 and 52.79 mm in the two treatments that used the temperature control system; these values are similar to the maximum tadpole length found by Munguia-Fragozo et al (2015). In an experiment of feeding rations reported by Seixas-Filho et al (2008), who also used a stocking density of 1 tadpole/L, values for maximum growth fit with the K m value. In the treatments with regulated temperature, K m values for tadpole head length were 19.6 and 24.6 mm; these are consistent with the experiment of Bambozzi et al (2004), where K m values for head length ranging from 16 to 21 mm were obtained by day 75 using six different photoperiod regimes.…”

“…In an experiment of feeding rations reported by Seixas‐Filho et al. (), who also used a stocking density of 1 tadpole/L, values for maximum growth fit with the K m value. In the treatments with regulated temperature, K m values for tadpole head length were 19.6 and 24.6 mm; these are consistent with the experiment of Bambozzi et al.…”

Performance of bullfrog tadpoles (Lithobates catesbeianus) fed balanced diets using alternative energy ingredients containing vegetable mesocarp

“…Tadpoles are animals that undergo constant anatomical and physiological changes. At this stage of life, the digestive system is still not prepared with sufficient lipolytic enzymes to break down this high content of lipids and allow their absorption (Seixas Filho et al, 2008c. However, avocado meal displayed a similar result to that of corn and therefore met the objective of this study, i.e., to identify substitutes for ground corn in diets for bullfrog tadpoles.…”