Quantification of arginine requirements of juvenile marine shrimp,Penaeus monodon,using microencapsulated arginine |
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Authors: | H-Y Chen Y-T Leu I Roelants |
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Institution: | (1) Institute of Marine Biology, National Sun Yat-sen University, 804 Kaohsiung, Taiwan, Republic of China;(2) Present address: Zoological Institute, Catholic University of Leuven, Naamsestraat 59, B-3000 Leuven, Belgium |
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Abstract: | Using microencapsulated L-arginine, the quantitative requirement for amino acid has been determined for the first time for a shrimp species, which can not effectively utilize crystalline amino acids. In an 8 wk feeding trial (1990), juvenile Penaeus monodon were fed casein-based purified diets containing one of six levels (13.1, 17.7, 22.3, 26.9, 31.5 and 36.1 g/kg diet) of arginine. In addition to the protein-bound arginine already present in the casein of the test diets, pure arginine was supplemented by L-arginine microencapsulated in cellulose acetate phthalate, which is easily assimilated. The arginine level required for optimal growth was determined by brokenline model analysis of weight gain data to be 25.0 g/kg diet (=54.7 g/kg protein). Examination of the hemolymph 3 h after feeding revealed that the free arginine level in the hemolymph had not increased as a result of increasing levels of the dietary arginine. There was an abrupt increase of urea in the hemolymph when the arginine requirement of the shrimp had been met. |
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