摘要
Abstract
The experiment was designed to study the effects of adding different levels of Microcin C7 to the bait of grass carp(Ctenopharyngodon idella)on its growth performance,and to explore the optimum level of Microcin C7 to be added to the bait in grass carp culture.In the study,400 grass carp weighing about 15g were divided into 4 treatments with 4 replicates in each group and 25 fish in each replicate according to the one-way experimental de-sign.Each group was fed with test bait containing 0 mg/kg,40 mg/kg,80 mg/kg and 120 mg/kg of Bacillus hep-tapeptide.The pre-feeding period was 1 week and the formal test period was 8 weeks.At the end of the experi-ment,the growth performance related indexes of grass carp in each group were tested.The results showed that the addition of Microcin C7 at 80 mg/kg and 120 mg/kg in grass carp culture could significantly increase the weight of grass carp at the end of the test(P＜0.05),which was significantly higher than that of the control group by 19.12％and 21.62％,respectively(P＜0.05);and the weight gain rate of the grass carp was significantly higher than that of the control group by 29.23％,which was significantly higher than that of the control group by 29.23％,respectively(P＜0.05),31.79％(P＜0.05);specific growth rate was significantly increased by 17.68％and 22.10％(P＜0.05),respectively,compared with the control group;and the addition of Microcin C7 at 80mg/kg and 120mg/kg significantly reduced the bait coefficient(P＜0.05)of grass carp by 8.87％and 9.85％(P＜0.05),respectively,compared with the control group.The study showed that the use of appropriate amount of Microcin C7 in grass carp culture can significantly improve the growth performance of grass carp,and the optimum level of Micro-cin C7 is 80 mg/kg considering the comprehensive culture cost.关键词
草鱼(Ctenopharyngodon idella)/杆菌七肽(Microcin C7,McC)/生长性能Key words
Ctenopharyngodon idella/Microcin C7/growth performance分类
农业科技
