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Huang, Y.-S., & Liao, L.-Y. The effect of dietary protein levels on the compensation growth and body composition of softshell turtle, trionyx sinensis, through temperature reduction and restoration.
Added by: Admin (25 Aug 2008 21:58:11 UTC) |
| Resource type: Journal Article BibTeX citation key: Huang View all bibliographic details  |
Categories: General Keywords: Ernährung = nutrition, Schildkröten = turtles + tortoises Creators: Huang, Liao |
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| Abstract |
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The objective of this study was to investigate the effect of refeeding softshell turtle (T. sinensis) with different dietary protein levels on the growth and body composition after a temperature reduction and restoration program. Six isoenergetic experimental diets (350 kcal/100 g) containing 20% to 45% protein were fed to triplicate groups of 10 softshell turtles (initial weight: 5.9¡Ó0.1 g) for 8 weeks. After ten weeks of feeding 20-45% dietary protein at 28oC, water temperature was reduced to 15oC at a rate of 1oC /6 hrs. These experimental groups were held at 15oC for three weeks before water temperature was elevated back to 28oC at 1oC/6 hrs. Another 3 weeks of refeeding started when water temperature was restored to 28oC. The control groups were fed the same diets in correspondence to each of the half of the experimental groups except that they were maintained at 28oC and fed the corresponding diets throughout the whole experiment. The values of weight loss were between 8.20-13.08% and showed no significant differences among the six dietary protein levels after 3 weeks of exposure at 15oC. The compensatory growth rate increased with increasing dietary protein levels, and the highest value was 16.0% found on the group fed a 45%. Body protein, body fat, liver lipid and glycogen of T. Sinensis were all significantly decreased after 3 weeks of exposure at 15oC; however, these values except body lipid went back to the levels before the onset of temperature reduction after 3 weeks of refeeding at 28oC. The percent of ash of the body content were significantly higher in the samples at 15oC than those at 28oC either before or after exposed to 15oC. The percentage of body protein increased while those of ash and liver lipid decreased with increasing dietary protein level after 3 weeks of refeeding at 28oC. The above phenomenon suggests that dietary protein play the major role in compensation growth of soft shell turtle after elevation from a previous low temperature environment.
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