This study evaluated the effect of using fresh sugar cane, sugar cane silage with or without
Lactobacillus buchneri, and burnt sugar cane silage with or without L. buchneri on ingestive behavior, nitrogen
balance and synthesis of microbial nitrogen compounds of dairy cows. Five ¾ Holstein x Gir crossbred cows,
assigned to a 5 x 5 Latin square design, were given diets with a 60:40 forage: concentrate ratio on a dry matter
basis, to meet an average body weight of 550 kg and production of 15 kg of milk per day. The treatment with
fresh sugar cane showed higher values (p < 0.05) for dry matter feed efficiency (3,133.3 vs 2,234.47 g DM h-1)
and rumination (1,642.3 vs 1,222.93 g DM h-1) compared to the silages. There was a shorter total chewing time
(58.7 vs 81.5 min. kg-1 DM) for fresh sugar cane when compared to silages without inoculum. The addition of
microbial additive during ensiling of sugar cane did not alter (p > 0.05) the nitrogen intake and balance, but led
to a greater (p < 0.05) synthesis of microbial nitrogen. Microbial efficiency was not affected (p > 0.05), and
showed an average value of 204.32 g microbial crude protein kg-1 total digestible nutrients.
Keywords: Lactobacillus buchneri, microbial synthesis, nitrogen balance, Saccharum officinarum.