【摘要】 选用体长(10.16±0.14)cm,体重(21.20±0.24)g的草鱼种630尾,随机分为7个试验组,每组设置3个重复,每个重复30尾草鱼。在纯化饲料中添加0、0.15、0.3、0.6、1.2、2.4、4.8 mg/kg的硒,以0 mg/kg添加组为对照组,进行为期84 d的生长试验以研究饲料不同硒水平对草鱼生长、营养组成和消化酶活性的影响。结果表明:饲料中添加硒能促进草鱼的生长,提高饲料效率,提高体蛋白含量,降低脂肪含量,提高草鱼消化酶活性。饲料硒对草鱼脂肪酶活性的影响最为显著(P<0.05)。当硒添加量为0.6 mg/kg时,草鱼的特定生长率、增重率、饲料效率、蛋白质效率和饲料蛋白沉积效率为最大值,与对照组相比,其特定生长率和饲料效率分别提高了28.37%和38.30%;草鱼鱼体蛋白含量最高,脂肪含量最低;草鱼的肝胰脏和肠道蛋白酶、淀粉酶以及脂肪酶活性均达最大值,其中肝胰脏和肠道脂肪酶活性分别比对照组提高了205.55%和249.33%。上述研究表明饲料中适量添加硒能提高消化酶活性,改善草鱼品质,促进生长。更多还原

【Abstract】 630 grass carps [initial length:(10.16±0.14) cm,initial weight:(21.20±0.24) g] were randomly divided into 7 treatments(90 for each treatment,30 for each replicate) to study the effects of dietary selenium on growth performance,nutritional composition and digestive enzyme activities of grass carp by feeding 7 pure diets with 0,0.15,0.3,0.6,1.2,2.4,4.8 mg Se/kg diet.The basal diet which was added 0 mg selenium per kilogram was used as control group.After a 84-day feeding trail,the results showed that: dietary selenium had significantly affected growth,nutritional composition and digestive enzyme activities of grass carp(P<0.05).The special growth rate(SGR),weight gain(WG),feed efficiency(FE),protein efficiency ration(PER),protein reservation rates(PRR),the crude protein of fish body and muscle as well as the activities of the three digestive enzymes were highest in fish fed diet with 0.6 mg Se/Kg diet;while the fat content is the lowest.The specific growth rates(SGR),feed efficiency(FE) increased 28.37% and 38.30% respectively while hepatic and intestinal lipase increased 205.55% and 249.33% respectively compared with the control group.All of these results demonstrated that the activities of digestive enzyme were enhanced by adding selenium so as to improve fish quality and accelerate grass carp to growthr.更多还原