摘要
为探讨不同饲料蛋白水平对东方高原鳅生长性能的影响,试验选用体质量为(18.36±0.91)g健康鱼540尾,随机分为6个组,每组3个平行,每个平行30尾鱼,并分别放入18个水族缸中,分别投喂蛋白质水平为20%、25%、30%、35%、40%和45%的饲料,日饱食投喂3次,整个试验持续60 d。试验结果表明,随着饲料蛋白水平的增加,东方高原鳅摄食率呈先升高后趋于稳定的变化趋势,通过二次回归方程得出,东方高原鳅最佳摄食率的饲料蛋白水平为40.77%。质量增加率和特定生长率随着蛋白水平的增加呈先升高后趋于稳定的趋势,基于折线的模拟结果表明,饲料蛋白水平分别高于32.48%和33.64%后,东方高原鳅质量增加率和特定生长率不再显著升高。随着饲料蛋白水平的增加,东方高原鳅氮摄入量和绝对氮摄入量均逐渐增加;蛋白质效率呈先升后降趋势,二次曲线拟合最高值时,蛋白水平为27.17%。饵料系数随着蛋白质水平的增加呈先降低后趋于稳定的变化趋势,基于折线模拟最低饲料系数时,蛋白水平为29.37%。各试验组成活率、肥满度、脏体比、肝体比差异不显著。综合考虑摄食率、质量增加率、特定生长率、蛋白质效率和饲料系数,东方高原鳅适宜蛋白需求为27.17%~33.64%。试验结果将为东方高原鳅优化人工配合饲料的科学配置提供理论依据。
A feeding trail was conducted to evaluate the effects of dietary protein levels on the growth performance of catfish-like loach Triplophysa orientalis.In total,540 individuals of catfish-like loach with initial body weight of(18.36±0.91)g were randomly divided into 6 groups with 3 replicates per group and 30 fish per replicate and fed six diets containing 20%,25%,30%,35%,40%and 45%protein for 60 d.The results showed that food ingestion rate(FR)of catfish-like loach was increased first and then tended to be stable with increase in dietary protein level.The quadratic polynomial regression analysis revealed that the maximal FR was found in catfish-like loach fed the diet containing protein level of 40.77%.The weight gain rate(WGR)and specific growth rate(SGR)were found to be increased at first and then tended to be stable with increase in dietary protein levels.The broken line simulation of the WGR and SGR showed that the catfish-like loach had no longer significantly increase in WGR and SGR at dietary protein levels varying from 32.48%to 33.64%.The nitrogen intake and absolute nitrogen intake of catfish-like loach were increased with increase in dietary protein level and protein efficiency rate(PER)increased first and then decreased,with the maximal PER in the catfish-like loach fed the diet containing protein levels 27.17%by the quadratic polynomial regression analysis.However,broken line simulation indicated that the food conversion ratio(FCR)of catfish-like loach was decreased first and then tended to be stable with increase in dietary protein level,with the minimal FCR at dietary protein level of 29.37%.There were no significant differences in survival rate(SR),condition factor(CF),viscera-somatic index(VSI)and hepaticsomatic index(HSI)among the test groups.Furthermore,comprehensive analysis of the FR,WGR,SGR,PER and FCR revealed that the optimal dietary protein level for catfish-like loach is of 27.17%—33.64%.The findings are intended to provide theoretical basis for the scientific allocation of artificial
作者
王万良
师海娜
曾本和
王金林
张庆渔
WANG Wanliang;SHI Haina;ZENG Benhe;WANG Jinlin;ZHANG Qingyu(Institute of Fisheries Science, Xizang Autonomous Region Academy of Agriculture and Animal Husbandry, Lhasa 850000, China;Qingyang Academy of Agricultural Sciences, Qingyang 745000, China;Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150000, China)
出处
《水产科学》
CAS
CSCD
北大核心
2020年第4期517-523,共7页
Fisheries Science
基金
农业农村部财政专项。
关键词
东方高原鳅
蛋白质水平
生长性能
饲料利用率
形体指标
Triplophysa orientalis
protein level
growth performance
feed utilization
morphological indicator
