dry matter (DM), were added to a basal ration consisted of concentrate mixture and corn
silage in a 4 × 4 Latin square design as experimental treatments, respectively. Each experimental period
consisted of a 12-day adaptation phase followed by a 3-day sampling phase. The results showed that
supplementing TA did not affect the N retention, but shifted the N excretion from urine to faeces, regulated
the urinary N components by decreasing urea and increasing hippuric acid.