饲料中添加乳酸杆菌对黄河鲤和建鲤正反交F1生长的影响

试验旨在研究饲料中添加乳酸杆菌对黄河鲤和建鲤正反交F1生长性能的影响。在基础饲料中分别添加乳酸杆菌含量为0(A01、A02对照组)、2×108cfu/kg(A11、A12)、4×108cfu/kg(A21、A22)、6×108cfu/kg(A31、A32)、8×108cfu/kg(A41、A42),采用室内循环水养殖系统,在水温为27.5～28.0℃的条件下,选取平均尾重(8.25±0.15)g黄河鲤和建鲤正反交F1各600尾,随机分为10组,每组设3个重复,每个重复40尾,进行56 d的生长试验。结果表明:各乳酸杆菌组的末重、增重率和特定生长率均显著高于对照组(P<0.05),添加水平在6×108cfu/kg时的终末体重、增重率、特定生长率最大,且反交F1生长较快,饵料系数最低,添加水平再增加,终末体重、增重率、特定生长率降低,饵料系数增加;以终末体重、增重率、特定生长率、饵料系数为指标,采用二次多项式分析表明,黄河鲤、建鲤正反交F1饲料中乳酸杆菌的适宜添加水平为(5.8～6.0)×108cfu/kg。

Effect of lactobacillus fermentum supplementation on growth performance of F1 reciprocal hybrids of cyprinus carpio haematopteru and cyprinus carpio var

The objective of this study was to investigate the effect of lactobacillus fermentum on growth performance of F1 reciprocal hybrids of cyprinus carpio(haematopterus)with cyprinus carpio var.Respectively 600 F1 hybrid with an average weight of(8.25±0.15) g were randomly divided into 10 groups with 3 replicates per groups and 40 fish per replicates in a circulated filtered rearing system for 56 d at 27.5～28.0 ℃,which the fed diets containing 0(control group A01,A02),2×108 cfu/kg(group A11,A12),4×108 cfu/kg(group A21,A22),6×108 cfu/kg(group A31,A32)and 8×108 cfu/kg(group A41,A42) lactobacillus fermentum,respectively.The results showed that the final body weight,weight gain ratio and specific growth ratio in lactobacillus fermentum supplementation groups were significantly higher and feed conversion rate lower than those in the control group(P<0.05).Terminal body weight,weight gain ratio,specific growth ratio increased to the maximum value of 6×108 cfu/kg dietary lactobacillus fermentum level,then decreased with the increasing level of lactobacillus fermentum.Based on the parabolic model between terminal body weight,weight gain rate,specific growth rate and feed conversion ratio on growth performance,the right dietary lactobacillus fermentum requirement for F1 reciprocal hybrids were estimated to be(5.8～6.0)×108 cfu/kg.