缩合单宁对海鲈生长性能、体成分、营养物质表观消化率及肠道组织结构的影响

doi:10.16431/j.cnki.1671-7236.2022.08.011

摘要/Abstract

摘要： 【目的】通过研究饲料中添加缩合单宁对海鲈生长性能、体成分、营养物质表观消化率及肠道组织结构的影响,探讨缩合单宁作为水产饲料添加剂的潜在应用价值。【方法】选择初始体重为(2.76±0.05) g的健康海鲈480尾,随机分为3组,每组4个重复,每个重复40尾。分别投喂3种等氮等脂饲料,即T1(基础饲料,对照组)、T2(基础饲料＋1 g/kg缩合单宁)和T3(基础饲料＋2 g/kg缩合单宁)。采取饱食投喂方式,试验周期为63 d。【结果】各组之间成活率和饲料系数无显著差异(P＞0.05),T3组终末体重、增重率和特定生长率显著低于T1和T2组(P＜0.05);各组之间全鱼水分、粗蛋白质、粗脂肪和灰分含量均无显著差异(P＞0.05);干物质和粗蛋白质表观消化率均表现为T1＞T2＞T3(P＜0.05),T3组粗脂肪表观消化率显著低于T1组(P＜0.05),T1和T2组之间粗脂肪表观消化率无显著差异(P＞0.05),各组之间灰分表观消化率无显著差异(P＞0.05);与T1组相比,T2和T3组海鲈肠道出现不同程度损伤,表现为绒毛长度显著降低(P＜0.05),杯状细胞数量显著增加(P＜0.05)。【结论】饲料中添加1 g/kg缩合单宁不影响海鲈生长性能,但降低了干物质和粗蛋白质表观消化率,添加2 g/kg缩合单宁抑制了海鲈生长,降低了干物质、粗蛋白质和粗脂肪的表观消化率,且破坏了肠道组织结构。缩合单宁可作为饲料添加剂应用于海鲈,建议添加剂量不超过1 g/kg。

关键词: 缩合单宁; 海鲈; 生长性能; 消化率; 肠道形态

Abstract: 【Objective】 The effects of dietary condensed tannins (CT) on growth performance,body composition,apparent digestibility of nutrients,and intestinal morphology of Lateolabtax maculatus were studied to assess the potential application value of CT as aquatic feed additive.【Method】 A total of 480 Lateolabtax maculatus with an initial body weight of (2.76±0.05) g were randomly divided into 4 groups with 4 tanks per group and 40 shrimp per tank.Three isonitrogenous and isolipidic diets,named T1 (basal diet,control group),T2 (basal diet+1 g/kg of CT) and T3 (basal diet+2 g/kg of CT) were prepared in this study,and fish was fed to apparent satiation during the 63-d feeding trial.【Result】 Survival rate and feed conversion ratio were similar among 4 groups (P>0.05). The final body weight,weight gain rate and specific growth rate were lower in T3 group than those in T1 and T2 groups (P<0.05).Dietary treatment did not alter the whole body composition of moisture,crude protein,crude lipid and ash (P>0.05).Apparent digestibility of dry matter and crude protein were T1>T2>T3 (P<0.05). The apparent digestibility of crude lipid was lower in T3 group than that in T1 group (P<0.05),but it was similar between T1 and T2 groups (P>0.05).Dietary treatment did not alter the apparent digestibility of ash (P>0.05).Compared with T1 group,Lateolabtax maculatus in T2 and T3 groups had different degree of intestinal injury along with decreased villus length (P<0.05) and increased goblet cell numbers (P<0.05).【Conclusion】 Adding 1 g/kg of CT did not alter growth performance of Lateolabtax maculatus,but reduced apparent digestibilities of dry matter and crude protein.Adding 2 g/kg of CT inhibited growth performance,decreased nutrients apparent digestibility and damaged intestinal morphology of fish.CT could be used as feed additive to be applied in Lateolabtax maculatus diet,and the dosage should be less than 1 g/kg.

Key words: condensed tannins; Lateolabtax maculatus; growth performance; digestibility; intestinal morphology

中图分类号:

S816.7

彭凯, 陈冰, 赵红霞, 王丽娟, 朱喜锋, 黄文. 缩合单宁对海鲈生长性能、体成分、营养物质表观消化率及肠道组织结构的影响[J]. 中国畜牧兽医, 2022, 49(8): 2953-2960.

PENG Kai, CHEN Bing, ZHAO Hongxia, WANG Lijuan, ZHU Xifeng, HUANG Wen. Effects of Condensed Tannins on Growth Performance,Body Composition,Apparent Digestibility of Nutrients,and Intestinal Morphology of Lateolabtax maculatus[J]. China Animal Husbandry and Veterinary Medicine, 2022, 49(8): 2953-2960.

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