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Carbohydrate utilization and its protein-sparing effect in diets for grouper (Epinephelus malabaricus)

Published online by Cambridge University Press:  18 August 2016

S. Y. Shiau  and
Y. H. Lin
S. Y. Shiau*
Affiliation:
Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan 202, Republic of China
Y. H. Lin
Affiliation:
Department of Food Science, National Taiwan Ocean University, Keelung, Taiwan 202, Republic of China
*
E-mail:syshiau@mail.ntou.edu.tw
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Abstract

To investigate the utilization of different carbohydrate sources and the possible protein-sparing effects of carbohydrates for grouper (Epinephelus malabaricus), six isoeneregtic purified diets were prepared. Three dietary protein levels (500, 460, 420 g/kg) were achieved by substitution with three levels (143, 195, 246 g/kg) and two sources (glucose and starch) of dietary carbohydrate. Each of the six diets was given to triplicate groups of grouper in a recirculating rearing system for 8 weeks. In the glucose group, weight gain of fish decreased with increasing dietary glucose and decreasing protein content. In the starch group, weight gain of fish given the 500 g/kg protein diet was higher (P < 0 ·05) than fish given the 460 and 420 g/kg protein diets. At each of the dietary protein levels weight gain of the glucose-group fish and the starch-group fish were similar (P > 0·05). At the 500 g/kg dietary protein level body lipid content of the starch-group fish was higher than that of glucose-group fish. At 500 and 460 g/kg dietary protein levels, fish given starch diets had higher hepatic hexokinase activity than fish given the glucose diets. These results suggest that, at the levels studies, the utilization of starch and glucose by grouper is similar. Decreasing the dietary protein level from 460 g/kg to 420 g/kg by increasing the starch content in the diet from 195 g/kg to 246 g/kg did not reduce (P > 0·05) weight gain and food efficiency, suggesting that starch could spare some protein when the dietary protein level is low.

Keywords

carbohydratesgroupersprotein
Type
Non-ruminant, nutrition, behaviour and production
Information
Animal Science , Volume 73 , Issue 2 , October 2001 , pp. 299 - 304
Copyright
Copyright © British Society of Animal Science 2001

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