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《Feed Industry》 2015-20
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Effect of chitosan on growth performance, intestinal digestive enzymes activities, serum biochemical indexes and cadmium residue of genetic improvement of farmed tilapia(GIFT, Oreochromis Niloticus)under dietary cadmium stress

Zhai Shaowei;Jia Jingtao;Sun Xiuwen;  
A 7- week feeding trial with singlefactor randomized block design was conductedto investigate the effects of chitosan(CTS) onsubchronic toxicity of dietary cadmium(Cd) togenetic improvement of farmed tilapia(Oreochro-mis niloticus). The fish with an initial averageweight of(10.69±0.55) g were randomly divided into four treatment groups. The chitosan levels in the four groups with 50 mg/kg dietary cadmium were 0.0%, 0.5%, 1.0% and 1.5%, respectively. The weight gain rate and specific growth rate in CTS supplementation groups were significantly higher than those in Cd group without CTS supplementation(P0.05), these growth performance parameters were improved with the increasing CTS supplementation level. The intestinal digestive enzymes activities were ameliorated by CTS supplementation. The activities of amylase in 1.5% CTS supplementation group, lipase in 1.0% and 1.5%CTS supplementation groups and protease in all CTS supplementation groups were significantly higher than those in Cd group. Compared with Cd group, Cd levels in intestine, muscle and farming water of CTS supplementation groups were significantly decreased(P0.05), Cd levels in feces of CTS supplementation groups were significantly increased(P0.05). The results suggested that the toxicity of dietary Cd on GIFT tilapia might be alleviated by supplementation with CTS in diet. The adsorption by CTS in fish intestinal tract might play an important role on alleviating the toxicity of dietary Cd.
【Fund】: 福建省科技厅农业科技重点项目“高效消除饲料重金属对鱼体毒害作用的添加剂研发[2012N0017]”
【CateGory Index】: S965.125
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