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作 者:王洪荣[1] 邵凯[1] 荣威恒[1] 徐桂梅[1] 张海鹰[1] 珊丹[1] 包赛娜
机构地区:[1]内蒙古畜牧科学院
出 处:《畜牧兽医学报》1998年第4期322-331,共10页ACTA VETERINARIA ET ZOOTECHNICA SINICA
基 金:国家自然科学基金
摘 要:选用9只1.5岁安装永久性瘤胃瘘管、十二指肠近端和回肠末端T型痿管的内蒙古细毛羊羯羊(30.14±1.13kg)进行配对分组试验。试验羊分3组(每组3个重复),即对照组(基础日粮)、ZnO组(基础日粮+ZnO+Met)和蛋氨酸锌(Zn-Met)组(基础日粮+Zn-Met)。试验结果表明:饲喂不同锌源绵羊瘤胃内锌的流量(mg/d)间差异不显著;ZnO组和Zn-Met组绵羊在十二指肠和回肠中锌流量显著高于对照组(P<0.05)。Zn-Met组绵羊在十二指肠内锌的吸收率显著高于ZnO组和对照组,而ZnO组绵羊在回肠后锌的吸收率较高;饲喂不同锌源绵羊的瘤胃食糜外流速度常数(Kp)、瘤胃、十二指肠和回肠的干物质和氮流量间差异不显著;饲喂Zn-Met可显著提高进入十二指肠内微生物氮和蛋氨酸流量(P<0.05),并有助于提高绵羊回肠对氮的吸收率。不同锌源对绵羊瘤胃食糜和瘤胃微生物的氨基酸组成无显著影响,对进入十二指肠的氨基酸组成有较大影响,其中Zn-Met组十二指肠食糜中的Glu、Val、Ile、Leu、Arg都比对照组和ZnO组降低,而Gly、Cys、Met、Tyr和His都比对照组和ZnO显著提高(P<0.05)。该?ine Inner Mongolian fine wool wethers (initial average BW 3014kg) equipped with permanent cannulae in the rumen and with Tshape cannulas in the proximal duodenum and terminal ileum were used in a matching factorial design experimentThe sheep were divided into three groups fed with Zinc methionine (Zn-Met) chelate,Zinc oxide (ZnO) and basal (Control) diets respectively and were used to investigate effects of different Zinc sources on the Zinc digested and absorbed sites in the digestive tract and digestion of deitary nutrients in sheepThe results showed that there were no significant differences in Zinc flows in the rumen among different Zinc source groupsApparent Zinc absorption in the duodenum of sheep fed with ZnMet was higher than those fed with ZnO and basal diet significantly,but the Zinc absorption from postileum of the sheep fed with ZnO was higher compared with control and ZnMetAnd the ruminal digesta flows rate(kp)、dry matter and total nitrogen flows in the rumen、duodenum and ileum were no differences among the three groupsHowever,the microbial nitrogen and methionine flows in the duodenum were improved significanfly when sheep were offered ZnMet diet(P<005)There was no significant differences in amino acid profiles in ruminal digesta and their microbials among the sheep fed with different Zinc source dietsBut the amino acid profile entering the duodenum were changed when sheep fed with different Zinc source diets in which Glu、Val、Ile、Leu、Arg were decreased and Gly、Cys、Met、Tyr and His were incr
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