摘要
试验旨在研究不同糖源代乳料对肉用犊牛生长性能、体尺指数及营养物质消化率的影响。选取20头新生黑安格斯犊牛,随机分为4组,每组5头。对照组随母牛饲喂,A、B、C组分别饲喂以葡萄糖、乳清粉和熟化玉米粉为主要糖源的代乳粉,30日龄时开始正式试验,试验期为45d。分别在犊牛30、45、60、75日龄时进行空腹称重,测量体尺,每天观察记录犊牛的腹泻情况。在35~43和65~73日龄进行两期消化试验,采集样品,测定表观消化率。结果显示,试验前期不同糖源对各试验组犊牛影响明显,30~45日龄时C组平均日增重显著低于A、B组(P<0.05),并极显著低于对照组(P<0.01),A组日增重显著低于对照组和B组(P<0.05);C组DM表观消化率显著低于A、B组(P<0.05);CP表观消化率显著低于A组(P<0.05),极显著低于B组(P<0.01);犊牛腹泻率在这一时期也偏高。45日龄后这种影响逐渐减小,A、B组犊牛日增重开始增加,与对照组差异不显著(P>0.05),C组犊牛生长速度也快速增加,到75日龄时平均日增重与A组差异不显著(P>0.05);第二期消化试验中各试验组犊牛营养物质的表观消化率均明显提高,犊牛腹泻率也开始降低,试验后期降至为0。而在整个试验期不同糖源对各组的体尺及体尺指数影响不大。综上,在试验中乳糖效果最好,葡萄糖次之,熟化玉米粉则在前期效果不佳,但随着犊牛日龄的增加效果逐渐改善。
The objective of this study was to determine the effect of different carbohydrate sources on growth performance, body size indexes and nutrients apparent digestibility of beef calves. Twenty newborn Black Angus calves were randomly divided into 4 treatments,5 replications per treatment and 1 calve per replication. The calves in control group fed with milk,while that of groups A,B and C fed with glucose,whey powder and ripened corn powder as the main carbohydrate source of milk replacer,respectively. The test was start when the calves were 30 days of age,and the trial period lasted for 45 days. The body weight and body indexes of calves were measured at 30,45,60 and 75 days of age. Two digestion tests were arranged at 35-43 and 65-73 days of age,in addition,the incidence of diarrhea was documented daily. The results showed that the effect of different carbohydrate source on the calves was obvious in the first period. At 30-45 days of age,the average daily gain of group C was extremely significantly lower than that of control group (P〈 0.01),and significant lower than groups A and B (P〈 0.05),while that of group A was significantly lower than that of control group and group B (P〈 0.05).The DM apparent digestibility rate of group C was significantly lower than that of groups A and B (P〈 0.05),the apparent digestibility of CP was significantly lower than that of group A (P〈 0.05) and extremely significantly lower than that of group B (P〈 0.01),diarrhea rate was also high in this period. After 45 days of age,this influence decreased,the average daily gain of groups A and B began to increase,and there was no significant difference compared with control group (P〉 0.05). The growth rate of group C increased rapidly,and there was no significant difference of average daily gain compared with group A at 75 days of age (P〉 0.05).The nutrient apparent digestibility were improved in the second digestible test,and the diarrhea rate began to decrease which was 0 at the end of the test. During the whole experiment,the different carbohydrate source had little effect on the body indexes. In conclusion,whey powder showed the best effects in the experiment,flowed by glucose and the effect of ripened corn powder was poor in the early,but it became better with the increase of calves' age.
出处
《中国畜牧兽医》
CAS
北大核心
2017年第6期1726-1733,共8页
China Animal Husbandry & Veterinary Medicine
基金
新疆兵团重大科技项目(2014AA001)
关键词
肉用犊牛
糖源
代乳料
生长性能
养分表观消化率
beef calves
carbohydrate source
milk replacer
growth performance
nutrients appar-ent digestibility