Abstract: Six adult Small-tail Han rams at the age of 1 to 1.5 years,with the average body weight of 55.3 kg±3.8 kg,fitted with the permanent duodenum and ileum T-type canula,were fed with concentrate-type diet(cornstalk as 30%),collecting the chyme of the duodenum and ileum to study the effect of supplement of aerosol OT(0.8 g/kg of diet (as DM basis))on the digestion and absorption in the former stomach and small intestine by self-control experimental design.The results showed that by supplementing of aerosol OT the voluntary intake of dry matter was increased by 23.6%(P<0.01),the digested DM,OM,CP and cellulose in former stomach were increased by 39.2%(P<0.01),37.3%(P<0.01),21.8%(P<0.01) and 13.4%(P<0.01) respectively;DM,OM,CP,microbial protein and by-pass protein arrived at small intestine were increased by 8.9%(P<0.01),8.8%(P<0.01),21.3%(P<0.01),29.3%(P<0.01) and 13.1%(P<0.01),respectively;The total amino acids,lysine,methionine,threonine,valine and phenylalanine arrived at small intestine were increased by 45.6%(P<0.01),62.7%(P<0.01),40.8%(P<0.01),32.8%(P<0.01),32.0%(P<0.01) and 32.3%(P<0.01),respectively.DM,OM,CP,calcium and phosphorous absorbed in small intestine were increased by 28.7%(P<0.01),29.8%(P<0.01),28.7%(P<0.01),26.6%(P<0.01) and 13.1%(P<0.01),respectively;The total amino acids,lysine,methionine,isoleucine,arginine and histidine absorbed in small intestine were increased by 37.6%(P<0.01),56.9%(P<0.01),28.6%(P<0.01),40.9%(P<0.01),41.5%(P<0.01) and 51.7%(P<0.01),respectively.It was concluded that the supplement of aerosol OT could increase the voluntary intake and the digestion and absorption in forestomach and small intestine,therefore significantly modify the nutrient supply for sheep.

Key words: aerosol OT; Small-tail Han sheep; former stomach; small intestine; digestion