妊娠后期及哺乳期湖羊复胃消化代谢的变化

DIGESTION AND METABOLISM IN THE COMPLEX STOMACH DURING LATE PREGNANCY AND LACTATION IN HU SHEEP

实验动物为3头装有长久性十二指肠双筒 T 形瘘管的初产湖羊.妊娠后期及哺乳期湖羊的皱胃食糜排空均为较均衡的间歇性模式,食糜组成相对稳定,但饲喂后食糜排空量以及食糜干物质(DM)、粗蛋白(CPR)和氨氮(NH_3-N)成分有所增高.两期相比,哺乳期进入十二指肠的食糜总量,以及总氮(TN),非氨氮(NAN),微生物氮(MCP-N)和非微生物氮(NMCP-N)的绝对量都高于妊娠后期,而瘤胃内 MCP 的合成效率及酸性洗涤纤维(ADF)消化率则以妊娠后期较高.

The animals used in the experiments were three first lambed Hu sheep fitted withduodenal cannulae.The experiments indicated that the outflow patterns of abomasaldigesta into duodenum in late pregnancy and lactation were similar and the components ofdigesta were relatively stable.The absolute quantities of digesta,TN,NAN,microbial protein nitrogen andnon-microbial protein nitrogen passing to the duodenum in lactation were higher thanthose in late pregnancy,respectively.On the contrary,both the efficiency of microbial pro-tein synthsis and digestibility of ADF in the rumen in late pregnancy were higher than thosein lactation.