Effects of feeding on tetracycline and streptomycin on growth and gut digestive enzymes of Hepjalus gonggaensis
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Key Words：hepjalus gonggaensis larvae， antibiotics feeding， digestive enzyme activities， amylase， proteinase， trehalase，cellulase
Abstract：The activities of different digestive enzymes in the gut of 4th instar larvae of Hepjalus gonggaensis Fu & Huang,sd.nov. feeding on antibiotics (tetracycline and streptomycin) were detected and compared with normal breeding larvae. The result showed that amylase and proteinase were the major digestive enzymes in H. gonggaensis, as well as trehalase, maltase and cellulase. After feeding on antibiotics, the body weight increasing rate decreased significantly (P<0.01), and the activities of all digest enzymes decreased ignificantly (P<0.01), in which cellulase and hemicellulase couldn't be detected. It showed that antibiotics may be poisonous to the gut cells of H. gonggaensis, or antibiotics inhibited the gut microorganisms and changed the digestion physiology.