摘要
本试验旨在研究饲粮维生素B_2添加水平对育成期水貂生长性能、营养物质消化率及氮代谢的影响。选取(65±5)日龄、体重[(1 213.38±72.72) g]相近的健康雄性短毛黑水貂96只,随机分为6个组,每组16个重复,每个重复1只水貂。采用单因素试验设计,各组饲粮维生素B_2添加水平分别为0(Ⅰ组)、2.5(Ⅱ组)、5.0(Ⅲ组)、10.0(Ⅳ组)、20.0(Ⅴ组)、40.0 mg/kg(Ⅵ组)。预试期7 d,正试期58 d。结果表明:1)饲粮维生素B_2添加水平显著影响水貂末重和料重比(P<0.05),极显著影响水貂平均日增重(P<0.01),其中以Ⅴ组平均日增重、末重最大,料重比最小。Ⅴ组平均日增重显著或极显著高于Ⅰ、Ⅱ、Ⅲ和Ⅳ组(P<0.05或P<0.01),Ⅴ、Ⅵ组料重比显著或极显著低于Ⅰ组(P<0.05或P<0.01),Ⅴ、Ⅵ组末重显著高于Ⅰ组(P<0.05)。2)饲粮维生素B_2添加水平极显著影响水貂粗蛋白质消化率和粗脂肪消化率(P<0.01),对水貂干物质采食量、干物质排出量和干物质消化率影响不显著(P>0.05)。Ⅵ组粗脂肪消化率最高,Ⅰ组最低,Ⅰ组极显著低于Ⅱ、Ⅴ和Ⅵ组(P<0.01)。Ⅴ组粗蛋白质消化率最高,极显著高于Ⅰ组(P<0.01)。3)饲粮维生素B_2添加水平显著影响育成期水貂氮沉积、净蛋白质利用率和蛋白质生物学价值(P<0.05),对食入氮、粪氮和尿氮影响不显著(P>0.05)。Ⅴ组净蛋白质利用率最高,显著高于Ⅰ和Ⅱ组(P<0.05),与Ⅲ、Ⅳ和Ⅵ组差异不显著(P>0.05)。Ⅴ组蛋白质生物学价值最高,Ⅴ和Ⅵ显著高于Ⅰ组(P<0.05),与Ⅱ、Ⅲ和Ⅳ组差异不显著(P>0.05)。Ⅵ组氮沉积最高,Ⅰ组最低,Ⅰ组显著低于Ⅴ和Ⅵ组(P<0.05),与Ⅱ、Ⅲ和Ⅳ组差异不显著(P>0.05)。综合各项指标,在本试验条件下,饲粮中维生素B_2添加水平为20.0 mg/kg(饲粮中维生素B_2水平为23.35 mg/kg)时,育成期水貂可以获得较好的生长性能及较高的营养物质消化率、氮利用率。
This experiment was conducted to evaluate the effects of dietary vitamin B 2 level on growth performance,nutrient digestibilities and nitrogen metabolism of growing minks.Ninety-six healthy short black male minks at the age of(65±5)days with the similar weight[(1 213.38±72.72)g]were randomly divided into 6 groups with 16 replicates per group and 1 mink per replicate.The experiment used a single factorial experiment design,and the dietary vitamin B 2 supplemental levels of 6 groups were 0(groupⅠ),2.5(groupⅡ),5.0(groupⅢ),10.0(groupⅣ),20.0(groupⅤ)and 40.0 mg/kg(groupⅥ),respectively.The adaptation period lasted for 7 days and the formal period lasted for 58 days.The results showed as follows:1)dietary vitamin B 2 level had significant effects on the final weight and feed to gain ratio of minks(P<0.05),and had extremely significant effect on the average daily gain of minks(P<0.01),the average daily gain and final weight of groupⅤwere the highest,while the feed to gain ratio was the lowest.The average daily gain of groupⅤwas significantly higher than that of groupsⅠ,Ⅱ,ⅢandⅣ(P<0.05 or P<0.01),the feed to gain ratio of groupsⅤandⅥwas significantly lower than that of groupⅠ(P<0.05 or P<0.01),the final weight of groupsⅤandⅥwas significantly higher than that of groupⅠ(P<0.05).2)Dietary vitamin B 2 level had extremely significant effects on the crude protein digestibility and ether extract digestibility of minks(P<0.01),while had no significant effects on the dry matter intake,dry matter output and dry matter digestibility of minks(P>0.05).The ether extract digestibility of groupⅥwas the highest,which of groupⅠwas the lowest,the ether extract digestibility of groupⅠwas extremely significantly lower than that of groupsⅡ,ⅤandⅥ(P<0.01).The crude protein digestibility of groupⅤwas the highest,which was extremely significantly higher than that of groupⅠ(P<0.01).3)Dietary vitamin B 2 level had significant effects on the nitrogen deposition,net protein utilization and the biological value of protein of minks(P<0.05),while had no significant effects on the nitrogen intake,fecal nitrogen and urine nitrogen of minks(P>0.05).The net protein utilization rate of groupⅤwas the highest,which was significantly higher than that of groupsⅠandⅡ(P<0.05),but had no significant difference with that of groupsⅢ,ⅣandⅥ(P>0.05).The biological value of protein of groupⅤwas the highest,which of groupsⅤandⅥwas significantly higher than that of groupⅠ(P<0.05),but had no significant difference with that of groupsⅡ,ⅢandⅣ(P>0.05).The nitrogen deposition of groupⅥwas the highest,which of groupⅠwas the lowest,the nitrogen deposition of groupⅠwas significantly lower than that of groupsⅤandⅥ(P<0.05),but had no significant difference with that of groupsⅡ,ⅢandⅣ(P>0.05).Considering all the factors,when dietary vitamin B 2 level is 20 mg/kg(dietary vitamin B 2 level is 23.35 mg/kg),growing minks can obtain the better growth performance and higher nutrient digestibilities and nitrogen utilization under the condition of this experiment.
作者
穆琳琳
钟伟
张海华
南韦肖
张新宇
陈双双
李光玉
MU Linlin;HONG Wei;ZHANG Haihua;NAN Weixiao;ZHANG Xinyu;CHEN Shuangshuang;LI Guangyu(State Key Laboratory of Special Economic Animal Molecular Biology,Institute of Economic Animal and Plant Science,Chinese Academy of Agriculture Sciences,Changchun 130112,China;Hebei Normal University of Science and Technology,Qinghuangdao 066004,China)
出处
《动物营养学报》
CAS
CSCD
北大核心
2018年第10期4005-4011,共7页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
中国农业科学院科技创新工程(CAAS-ASTIP-2017-ISAPS)
吉林省重点科技成果转化项目(NY[2016]0307022)。
关键词
水貂
维生素B2
生长性能
营养物质消化率
氮代谢
minks
vitamin B 2
growth performance
nutrient digestibilities
nitrogen metabolism