In this study, grazing behavior of mares and cows was compared on woodland pastures, in the context of foraging hierarchy. A horse-group (12 native Hokkaido horses) and a cattle-group (5 Hereford cows) were grazed on the woodland pastures of 13.3 ha and 5.8 ha, respectively. They grazed mainly on Sasa nipponica. Grazing behavior at a feeding station (FS) scale was recorded for three focal animals in each group. Mares took one bite per FS at a high percentage of FSs (24.3%) and cows took one, two and three bites per FS at high percentage (20.3%, 19.2% and 15.4%, respectively). Although feeding patch (FP) scale for both animals could be defined as a group of FSs, the length of FP and grazing behavior at FP scale were similar for both animals. The number of steps taken between two adjacent FSs or FPs for mares was larger than that for cows. The results suggested that both horses and cattle had similar foraging hierarchy from bite to FP scale but grazing behavior of horses at the FS scale was different from that of cattle, suggesting that grazing behavior of large herbivores has greater similarity in larger foraging hierarchies.
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