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The objective was to evaluate the ingestive behavior of crossbred heifers finished on a Brachiaria brizantha cv. Marandu pasture receiving four levels of glycerin in their supplementation. Thirty-six crossbred heifers with average initial weight of 264.83±3.83 kg and 20 months of age were distributed into a completely randomized design with four treatments and nine replications: control (0%), 4.82%, 10.12%, and 15.56% glycerin in the dry matter. The grazing time reduced linearly (p&lt;0.05), whereas the time spent on activities like rumination, idleness, trough and total chewing time were quadratically affected (p&lt;0.05). Bite rate and number of bites/day were quadratically influenced (p&lt;0.05). The number of bites/swallowed cud and the number of bites/minute, however, increased linearly (p&lt;0.05). Although the time spent on each cud and number of chews per cud were not affected (p&gt;0.05). The number of rumination periods reduced linearly (p&lt;0.05), whereas the number of grazing, idle and trough periods, and the times per grazing, idle, rumination and trough periods were quadratically affected (p&lt;0.05). The feed and rumination efficiencies of the dry matter, non-fibrous carbohydrates, pasture dry matter and concentrate were quadratically affected (p&gt;0.05) whereas the feed efficiency of neutral detergent fiber reduced linearly (p&lt;0.05). Addition of glycerin in substitution of corn in supplements for animals managed on pastures does not influenced feed intake, but reduces the grazing time and increases the idle time. The supplementation also improves feed and rumination efficiencies.

Ingestive Behavior of Heifers Supplemented with Glycerin in Substitution of Corn on <i>Brachiaria brizantha</i> Pasture