饲粮铜、锌添加水平对育成期蓝狐生长性能、营养物质消化率及氮代谢的影响  

Effects of Dietary Copper and Zinc Supplemental Levels on Growth Performance,Nutrient Digestibility and Nitrogen Metabolism of Growing Blue Foxes

作　　者：刘志[1,2] 吴学壮[1] 张铁涛[3] 郭俊刚[1] 郭强[2,3] 高秀华[1] 杨福合[2,3] 邢秀梅[2,3] 

机构地区：[1]中国农业科学院饲料研究所,北京100081 [2]吉林省特种经济动物分子生物学省部共建实验室,长春130112 [3]中国农业科学院特产研究所,长春130112

出　　处：《动物营养学报》2014年第9期2706-2713,共8页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金：国家自然资源平台专项"特种经济动物种质资源共享平台"(2005DKA21102)

摘　　要：本试验旨在研究饲粮铜、锌添加水平对育成期蓝狐生长性能、营养物质利用率及氮代谢的影响。试验采用2×3完全随机试验设计,分别在基础饲粮中添加2个水平的锌(40和120 mg/kg)和3个水平的铜(30、45和60 mg/kg),另设对照组(添加0 mg/kg铜和40 mg/kg锌)。选用(55±5)日龄、体重相近的健康雄性蓝狐84只,随机分成7组,每组12个重复,每个重复1只。预试期为7 d,正试期为75 d。结果表明:1)饲粮中添加铜有提高蓝狐平均日增重(P=0.06)和降低料重比(P=0.08)的趋势,但并未观测到铜、锌之间的互作效应(P>0.05)。30 mg/kg铜+40 mg/kg锌和45 mg/kg铜+120 mg/kg锌组平均日增重显著高于对照组(P<0.05),料重比显著低于对照组(P<0.05)。2)饲粮中添加铜能极显著提高蓝狐蛋白质和脂肪消化率(P<0.01)。60 mg/kg铜+40 mg/kg锌和60 mg/kg铜+120 mg/kg锌组蓝狐蛋白质消化率极显著高于对照组(P<0.01),45 mg/kg铜+120 mg/kg锌组显著高于对照组(P<0.05)。30 mg/kg铜+40 mg/kg锌、45 mg/kg铜+40 mg/kg锌、30 mg/kg铜+120 mg/kg锌、60 mg/kg铜+120 mg/kg锌组蓝狐脂肪消化率极显著高于对照组(P<0.01),45 mg/kg铜+120 mg/kg锌组显著高于对照组(P<0.05)。饲粮铜、锌添加水平对粪便中铜排出量有极显著影响(P<0.01);饲粮锌添加水平对粪便中锌排出量有极显著影响(P<0.01)。各组蓝狐铜排出量和锌排出量并未观测到铜、锌之间的互作效应(P>0.05)。3)饲粮中添加铜极显著降低了粪氮含量(P<0.01),饲粮铜、锌添加水平并未对各组蓝狐食入氮、尿氮、氮沉积含量及蛋白质生物学价值、净蛋白质利用率产生显著影响(P>0.05)。综合试验结果得出,育成期蓝狐饲粮中添加30 mg/kg铜+40 mg/kg锌(总铜、总锌水平为别37.68和80.08 mg/kg)时可提高蓝狐的生长性能和营养物质消化率,同时降低了粪便中氮的排放。This experiment was conducted to study the effects of dietary copper （Cu） and zinc （Zn） supple- mental level on growth performance, nutrient digestibility and nitrogen metabolism of growing blue foxes. The experiment used a 2x3 completely randomized experimental design. Experimental diets were supplemented with 2 Zn levels （40 and 120 mg/kg） and 3 Cu levels （30, 45 and 60 mg/kg）, respectively. The control group＇ s diet was supplemented with 0 mg/kg Cu and 40 mg/kg Zn. Eighty four healthy male blue foxes at the age of （55_＋5） days were randomly assigned into 7 groups with 12 replicates per group and 1 fox per replicate.The pre-trial period lasted for 7 days and the trial period lasted for 75 days. The results showed as follows： 1 ） diet- ary supplemented with Cu was tended to improve the average daily gain （ADG） （P = 0.06） and reduce the ratio of feed to gain （F/G） （P=0.08） of blue foxes, however, there was no interaction in ADG and F/G be- tween Cu and Zn （P〉0.05）. The ADG in 30 mg/kg Cu＋40 mg/kg Zn and 45 mg/kg Cu＋120 mg/kg Zn groups was significantly higher than that in control group （P〈0.05）, but the F/G was significantly lower than that in control group （P〈0.05）. 2 ） Dietary supplemented with Cu significantly increased the digestibility of protein and fat （ P〈0.01 ）. The protein digestibility in 60 mg/kg Cu＋40 mg/kg Zn, 60 mg/kg Cu＋120 mg/kg Zn and 45 mg/kg Cu＋120 mg/kg Zn groups was significantly higher than that in control group （P〈0.05 or P〈0.01）. The fat digestibility in 30 mg/kg Cu＋40 mg/kg Zn, 45 mg/kg Cu＋40 mg/kg Zn, 30 mg/kg Cu＋ 120 mg/kg Zn, 60 mg/kg Cu＋120 mg/kg Zn and 45 mg/kg Cu＋120 mg/kg Zn groups was significantly higher than that in control group （P〈0.05 or P〈0.01 ）. Dietary Cu and Zn supplemental level significantly af- fected the Cu output in faeces （P〈0.01）, dietary Zn supplemental level significantly affected the Zn output in faeces （P〈0.01）. There was no interaction in Cu o

关 键 词：铜 锌 育成期 生长性能 营养物质消化率 蓝狐 

分 类 号：S816.7[农业科学—饲料科学]