早期限饲对肉鸡屠宰性能和免疫器官指数的影响  

Effects of early feed-restriction on slaughter production and index of immune organs of broilers

作　　者：李兰会[1] 赵国先[1] 任志友[1] 

机构地区：[1]河北农业大学动物科技学院,河北保定071001

出　　处：《河北农业大学学报》2011年第5期82-87,共6页Journal of Hebei Agricultural University

基　　金：河北省科技厅科学技术研究与发展计划项目:肉鸡健康养殖关键技术研究(07220401D-9)

摘　　要：为研究早期限饲对肉鸡屠宰性能和免疫器官指数的影响,选用250只1日龄Ross 308肉仔鸡,随机分为10组,限饲起始日龄(5、7和10日龄)、持续时间(7、10和14 d)和强度(90%、80%和70%)3因素3水平按L9(34)正交试验设计。结果表明:对肉鸡42日龄活体、屠体、全净膛、胸肌和腿肌重的影响:限饲持续时间>强度>起始日龄,对腹脂重的影响限饲起始日龄>持续时间>强度;5日龄90%限饲7 d肉鸡42日龄的屠宰性能显著提高(P<0.05),5日龄70%限饲14 d抑制了肉鸡生长发育,屠宰性能显著降低(P<0.05);限饲1和3组肉鸡23和42日龄的甲状腺素T3和生长激素GH的水平均低于对照组,甲状腺素T4/T3均高于对照组;限饲延缓了免疫器官随日龄增长的变化趋势,不仅抑制了脾脏指数的增加,而且抑制了胸腺指数和法氏囊指数的降低,但差异不显著(P>0.05)。The experiment was conducted to determine the effects of early feed-restriction on slaughter production and index of immune organs.250 ROSS 308 broiler chickens were randomly allocated to ten groups divided by orthogonal L9（34） experiment including three factors each for three levels,starting time（5,7 and 10 days of age）,duration（7,10 and 14 days） and intensity（90%,80% and 70%） of feed restriction.Slaughter production of restriction showed a sequence of durationintensitystarting time.With the longer of duration and the stronger of intensity,there was a significant decrease of the weight of body,carcass,whole eviscerated,breast and leg.The index of spleen of 23 days about the three feed-restriction factors was all lower,and the index of 42 days all higher than the control group.The index of thymus of broilers of 23 days in feed-restriction groups was all lower and the index of bursa of fabricius of 42 days was also lower than the control group.Thyroxine T3 and growth hormone of feed-restriction broilers of group 1 and 3 at 23 and 42 days were both lower than the control group,while the ratio of T4/T3 was all higher than the control group.The broilers,feed-restricted at 5 days for 90% and 7 days,had a higher slaughter production than the control group,while the broilers restricted at 5 days for 70% and 14 days was stunned and did not have a compensatory growth at 42 days of age.Feed restriction weakened the tendency of immune organs with the days of age,inhibited the increase of spleen and the decrease of thymus and bursa of fabricius.Feed restriction decreased the basal metabolic rate,increased the deposit of fat with the decrease of thyroxine T3 and the ratio of T4/T3

关 键 词：限饲 肉鸡 屠宰性能 免疫器官指数 

分 类 号：S831.42[农业科学—畜牧学]