摘要
[目的]研究高效包被氧化锌对断奶仔猪生长性能、血液生化指标及微量元素(铜、铁、锌、锰)排泄量的影响。[方法]试验选取60头28日龄平均体重为(7.26±0.46)kg的杜×长×大三元杂交断奶仔猪,随机分为3组,每组设10个重复,每个重复2头仔猪。普通氧化锌组饲喂基础日粮+普通氧化锌1966 mg/kg,锌元素含量1500 mg/kg;高效包被氧化锌组饲喂基础日粮+高效包被氧化锌1000 mg/kg,锌元素含量500 mg/kg;基础日粮组饲喂不添加氧化锌的基础日粮。试验期为35 d,预试期7 d,正试期28 d。试验结束后计算仔猪平均日采食量、平均日增重、料重比、腹泻率;测定全血血红蛋白含量、铜锌—超氧化物歧化酶活力以及血液中铜、铁、锌元素含量;计算皮毛指数;测定粪便中铜、铁、锌、锰元素含量。[结果]与基础日粮组相比,普通氧化锌组和高效包被氧化锌组的平均日采食量和平均日增重均显著(P<0.05)提高,料重比和腹泻率显著(P<0.05)降低;高效包被氧化锌组的平均日采食量、平均日增重、料重比和腹泻率与普通氧化锌组相比差异不显著(P>0.05)。全血血红蛋白含量3组差异不显著(P>0.05);高效包被氧化锌组铜锌—超氧化物歧化酶活力显著(P<0.05)高于基础日粮组和普通氧化锌组;血液中铜、铁元素含量3组差异不显著(P>0.05);普通氧化锌组血液中锌元素含量显著(P<0.05)高于基础日粮组和高效包被氧化锌组。高效包被氧化锌组皮毛指数优于普通氧化锌组。高效包被氧化锌组粪便中的锌元素含量极显著(P<0.01)低于普通氧化锌组;各组粪便中的铜、铁、锰元素含量差异不显著(P>0.05)。[结论]日粮中添加锌元素含量为500 mg/kg的高效包被氧化锌能够降低断奶仔猪腹泻率,提高仔猪生长性能、皮毛指数和机体抗氧化能力,降低粪便中锌排放量,减少环境污染。
[Objective]To assess the effects of dietary supplementation of high-efficient coated zinc oxide on growth performance,blood biochemical indexes and trace elements(copper,iron,zinc and manganese)excretion in weaned piglets.[Method]A total of 60 healthy Duroc-Landrace-Yorkshire ternary hybrid weaned piglets aged 28 days and averagely weighed(7.26±0.46)kg were selected and randomly assigned into an ordinary zinc oxide group fed with a basal diet adding 1966 mg/kg ordinary zinc oxide(zinc content was 1500 mg/kg),a high-efficient coated zinc oxide group fed with a basal diet adding 1000 mg/kg high-efficient coated zinc oxide(zinc content was 500 mg/kg),and a control group fed with a basal diet without supplementation of zinc oxide in any forms.There were 10 replicates in each group and 2 piglets in each replicate.The experiment lasted for 35 days,including a 7-day pre-experiment period and a 28-day formal experiment period.At the end of the experiment,the average daily feed intake,average daily gain,feed/gain ratio(FGR)and diarrhea rate of the experimental piglets were calculated;the whole blood hemoglobin content,Cu,Zn-superoxide dismutase(Cu,Zn-SOD)activity,and blood contents of copper,iron and zinc were determined;the fecal contents of copper,iron,zinc and manganese were tested.[Result]Compared with control group,ordinary zinc oxide group and high-efficient coated zinc oxide group had significantly(P<0.05)increased average daily feed intake and average daily gain,and had significantly(P<0.05)decreased FGR and diarrhea rate;no significant(P>0.05)differences in average daily feed intake,average daily gain,FGR and diarrhea rate between high-efficient coated zinc oxide group and ordinary zinc oxide group were observed.There were no significant(P>0.05)differences in whole blood hemoglobin contents among the three groups;Cu,Zn-SOD activity in high-efficient coated zinc oxide group was significantly(P<0.05)higher than that in control group and ordinary zinc oxide group;no significant(P>0.05)differences in blood contents of copper and iron among the three groups were found;ordinary zinc oxide group had significantly(P<0.05)higher blood content of zinc compared with control group and high-efficient coated zinc oxide group.The coat index in high-efficient coated zinc oxide group was superior to that in ordinary zinc oxide group.The fecal content of zinc in high-efficient coated zinc oxide group was extremely significantly(P<0.01)lower than that in ordinary zinc oxide group;there were no significant(P>0.05)differences in fecal contents of copper,iron and manganese among the three groups.[Conclusion]Dietary supplementation of high-efficient coated zinc oxide containing 500 mg/kg zinc decreases the diarrhea rate and improves the growth performance,coat index and antioxidant ability of piglets.In addition,it reduces the fecal excretion of zinc,which is conductive to control the environmental pollution.
作者
李芳
游斌杰
郑萍
LI Fang;YOU Bin-jie;ZHENG Ping(Chengdu Shuxing Feed Co.,Ltd.,Chengdu 611633,China;Chongqing Academy of Animal Husbandry Sciences,Chongqing 402460,China;Institute of Animal Nutrition,Sichuan Agricultural University,Yaan 611130,China)
出处
《畜牧与饲料科学》
2021年第4期19-24,共6页
Animal Husbandry and Feed Science
基金
四川省科技计划项目“高效包被氧化锌技术研究与应用”(2018NZ0094)。
关键词
断奶仔猪
高效包被氧化锌
生长性能
weaned piglets
high-efficient coated zinc oxide
growth performance
