玉米品种及其玉米醇溶蛋白含量对山羊瘤胃淀粉降解率的影响  

Species and Zein Content of Corn: Effects on Ruminal Starch Degradation Rate in Goats

作　　者：张霞[1,2] 孙海洲[1] 赵存发[2] 李胜利[2] 桑丹[2] 艳城[1] 王美秀 

机构地区：[1]内蒙古农业大学动物科学学院,呼和浩特010018 [2]内蒙古农牧业科学院动物营养与饲料研究所,呼和浩特010031 [3]内蒙古鄂尔多斯市饲料草种监督检验站,鄂尔多斯017010

出　　处：《动物营养学报》2014年第3期783-791,共9页CHINESE JOURNAL OF ANIMAL NUTRITION

基　　金：国家绒毛用羊产业技术体系建设(CARS-40-12);国家科技支撑计划(2012BAD12B02)

摘　　要：本试验旨在研究不同品种饲用玉米及其玉米醇溶蛋白(zein)含量对山羊瘤胃淀粉降解率的影响。运用新比浊法测定8个内蒙古地区代表性的饲用玉米品种(久龙10号、久龙15号、登海3672、德丰359、京单58、丰田6号、种星2255、富尔306)的zein含量,并通过尼龙袋法和体外法测定山羊瘤胃淀粉有效降解率和7 h体外淀粉降解率。结果表明:1)京单58 zein含量[(3.09±0.36)%]最低,而瘤胃淀粉有效降解率[外流速率常数(Kp)=6%/h时,(43.11±0.04)%;Kp=4%/h时,(49.33±0.07)%]和7 h体外淀粉降解率[(62.08±1.24)%]均居8个品种之首;德丰359 zein含量[(6.04±0.32)%]最高,而瘤胃淀粉有效降解率[Kp=6%/h时,(35.91±0.03)%;Kp=4%/h时,(39.64±0.05)%]和7 h体外淀粉降解率[(52.93±0.42)%]均最低。2)玉米中zein含量和7 h体外淀粉降解率呈极显著的负相关关系(R2=0.89,P<0.01);与瘤胃淀粉有效降解率亦呈极显著的负相关关系(Kp=6%/h时,R2=0.82,P<0.01;Kp=6%/h时,R2=0.83,P<0.01)。3)玉米中zein含量(A)和淀粉含量(B)与7 h体外淀粉降解率(Y)的回归关系极显著,公式为:Y(%)=58.73+0.19B-2.68A(R2=0.94,P<0.01);而与瘤胃淀粉有效降解率(Y')的回归关系显著,公式为:Y6'(%)=47.84+0.04B-2.43A(Kp=6%/h时,R2=0.82,P<0.05),Y4'(%)=55.99+0.04B-3.29A(Kp=4%/h时,R2=0.83,P<0.05)。结果提示,为提高玉米饲用价值和节约成本,十分必要从玉米的种植到饲喂动物整个链条来考虑品种和zein含量对反刍动物消化道淀粉降解率的影响。This experimental was conducted to research the effects of different species and zein content of corn for feeding on ruminal starch degradation rate in goats. Zein content of 8 representative species of corn grains in Inner Mongolia region （Jiulong No. 10, Jiulong No. 15, Denghai 3672, Defeng 359, Jingdan 38, Feng-tian No. 6, Zhongxing 2255 and Fuer 306） was determined by nephelometry method, and ruminal starch deg-radation rate and 7 h in vitro starch degradation rate （7 h IVSD） in goats were determined by nylon bag and in vitro methods, respectively. The results showed as follows： 1 ） Jingdan 58 had the lowest zein content [（3. 09 ＆#177; 0. 36）%], and the highest ruminal starch efficient degradation rate [when outflow rate constant （Kp） =6%/h, （43. 11 ＆#177; 0. 04）%, when Kp =4%/h,（49. 33 ＆#177; 0. 07）%] and 7 h IVSD [（62. 08 ＆#177; 1. 24）%]; meanwhile, Defeng 359 had the highest zein content [（6. 04 ＆#177;0. 32）%], and the lowest ruminal starch efficient degradation rate [ when Kp =6%/h, （ 35. 91 ＆#177; 0. 03 ）%; when Kp =4%/h, （ 39. 64 ＆#177; 0. 05）%] and 7 h IVSD [（52. 93 ＆#177;0. 42）%]. 2） Corn zein content had a significantly negative relationship with 7 h IVSD （R2 =0. 89, P〈0. 01）, and had a significantly negative relationship with ruminal starch effi-cient degradation rate （when Kp=6%/h, R2 =0. 82, P〈0. 01; when Kp =4%/h, R2 =0. 83, P〈0. 01）. 3） Zein （ A） and starch contents of corn （ B） had a significant regression relationship with 7 h IVSD （ Y） [Y（%） =58. 73＋0. 19B-2. 68A（R2 =0. 94,P〈0. 01）], and had a significant regression relationship with ruminal starch efficient degradation rate [Y6′（%） =47. 84＋0. 04B-2. 43A （when Kp=6%/h, R2 =0. 82, P〈0. 05）; Y4′ （%） =55. 99 ＋0. 04B-3. 29A （when Kp=4%/h,R2 =0. 83, P〈0. 05）. In conclusion, in order to improve feeding value and save costs of corn, it is very important to control the effects of species and zein content of corn on the

关 键 词：山羊 玉米醇溶蛋白 7h体外淀粉降解率 

分 类 号：S826[农业科学—畜牧学]