饥饿再投喂对团头鲂生长、体组成及肠道消化酶的影响

采用饥饿后再投喂的投喂方式在室外网箱中用含粗蛋白32%、粗脂肪4%的商品饲料饲喂(4.5±0.2)g团头鲂(Megalobrama amblycephala Yih)48 d,试验鱼分5组:对照组(每日投喂)、S1F1组(隔日投喂)、S2F2组(隔2 d投喂2 d)、S4F4组(隔4 d投喂4 d)和S8F8组(隔8 ...

Effects of starvation-and-refeeding on the growth,body composition and intestinal digestive enzyme of Megalobrama amblycephala Yih

A 48-day multi-cycles experiment was carried out to determine the effects of repeating starvation-refeeding on the growth,body composition and digestive enzymes by feeding the artificial pellet in juvenile Megalobrama amblycephala Yih with initial weight of(4.5±0.2)g cultured in outdoor net-cages.Fish were assigned to five groups,namely the control group(daily feeding),test group S1F1(feeding every other day),test group S2F2(starvation 2 d,feeding 2 d),test group S4F4(starvation 4 d,feeding 4 d) and test group S8F8(starvation 8 d,feeding 8 d).By the end of the experiment,weight gain ratio of the test group S1F1 and S2F2 had no significant difference from that of the control group.Weight gain ratio of group S4F4 and S8F8 was significantly lower than that of the control group.However,special growth rates of all four test groups were significantly higher than that of the control group.Fish starving for 1-8ds(S1F1,S2F2,S4F4 and S8F8)mainly took fat as energy material to maintain their own metabolism and resuming feeding can make condition factor,moisture and crude protein of whole fish of the four test groups back to normal(the control group).However carcass ratio and crude fat of the fish of the four test groups are lower than those of the control group.Intestinal digestive enzyme activities of all four test groups were higher than those of the control group,and lipase was much more higher than that of the control group.And the activities of antioxidant enzymes in the liver of the fish of four test groups were higher than that of the control group.