four beef heifers ( 211 kg ) fitted with ruminal , duodenal and ileal cannulae ( t-type ) , were fed a high-concentrate diet with a low ( l ) or high ( h ) level of n ( 1.71 and 2.18 % , respectively ) , and received daily doses of either saline ( s ) or an antibiotic ( a ) mixture ( 2 g neomycin sulfate and .25 g bacitracin ) into the terminal ileum in a 4 x 4 latin-square experiment .
C0020885
cannulae
C0227327
terminal ileum