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Archivos de Zootecnia

On-line version ISSN 1885-4494Print version ISSN 0004-0592


SEIXAS FILHO, J.T. de et al. Enzyme activities of tadpoles of bullfrogs fed diets containing different levels of crude protein. Arch. zootec. [online]. 2011, vol.60, n.232, pp.1161-1170. ISSN 1885-4494.

This study was aimed to determine the digestive enzyme activity in bullfrog tadpoles, fed with commercial ration during 55 days, at the density of one tadpole per liter in 30 l boxes. After 18 days the levels of protein influenced the activity of amylase quadratically to the estimated 32% CP. The same trend was observed for the specific activity of amylase influenced by the level of 28% crude protein and the activity of trypsin that influenced by the level of 29% CP. There was no significant difference in lipase activity and specific lipase. At 26 days of the amylase enzyme activity and specific activity of amylase and trypsin decreased with increasing the percentage of protein. The enzyme lipase and lipase specific activity increased linearly to increased levels of protein. At 35 days of experiment amylase activity was statistically significant for treatment with 28% CP. The specific activity of amylase and trypsin activity decreased with increased protein in the diet. The activity of lipase at 35 and 55 days of the experiment increased significantly with increased protein in the diet. At 55 days of the experiment increased protein in the diet influenced in a linear activity of trypsin. The lipase activity and specific activity of lipase increased with increasing levels of dietary crude protein.

Keywords : Morphophysiology; Animal nutrition; Tadpole production.

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