R. Bras. Zootec.01/Nov/2008;37(11):1912-8.
Patterns in the use of time by steers in mixtures of Italian ryegrass (Lolium multiflorum Lam.) and black oat (Avena strigosa Schreb)
DOI: 10.1590/S1516-35982008001100002
Aiming to assess the steer grazing behavior, an experiment was carried out with pastures composed by italian ryegrass (Lolium multiflorum Lam.) and black oat (Avena Strigosa Schreb) submitted to different sward heights (10, 20, 30, and 40 cm). The sward heights were distributed in an experimental randomized block design with three replicates. Data was recorded by visual assessment, from sunrise until sundown, in three evaluation dates, two in the vegetative stage and one in the reproductive stage. The evaluated variables were grazing time, rumination time, idling time, number and length of meals, and number and length of meals intervals. Results indicated that with increasing sward height the animals reduced grazing time and the meal length as well, however, the ruminating time increased. The variables such as idling time, number of meals and number/length of intervals were not influenced by the sward surface height. The results showed changes in the animal grazing behavior due to the variations in sward height management.
Keywords: grazing process; steers; sward surface height