This work was carried out to study corn substituting by glycerin levels on animal behavior, feeding and rumination efficiency of Purunã young bulls finished in feed-lot. It was utilized 40 bulls Purunã breed with 208.8 ± 33.3 kg and eight months old. The diets were: without glycerin - G00, 6% of glycerin - G06, 12% of glycerin - G12 and 18% of glycerin - G18. Dry matter intake was similar among diets. On the other hand, NDF intake decreased linearly with glycerin levels supplementation in the diets. Feeding and rumination efficiency DM and NDF were similar among diets. Glycerin changed activities durations of bulls. Glycerin did not affect feed frequency. At contrary, rumination frequency was reduced linearly with glycerin inclusion. Others activities frequencies showed a quadratic effect with the glycerin addition. Glycerin inclusion in the diet reduced the time duration for feed frequency, but had no effect on the time spent for rumination frequency. However, the frequency duration for other activities increased linearly with glycerin inclusion.
behavior; cattle; feed intake; feed-lot; glycerol
