Two Napiergrass genotypes, a semi-dwarf late-heading, DL, and a true dwarf (Taiwan Line 7734), were examined for grazing potential on foggage pasture in winter and for rotational grazing on fresh grass pasture in summer by Japanese-Black (JB) breeding beef cows in southern Kyushu, Japan. In one-day intermittent grazing on foggage pasture from December to March, 2017, grazing time on Napiergrass increased up to late February, and pasture height and herbage mass decreased consistently with grazing. In the rotational grazing by three JB breeding beef cows during pregnancy over two cycles from mid-July to early September 2017, pre- and post-grazing plant height was higher for DL than 7734. Herbage mass was roughly comparable between the two genotypes in the first cycle, while it decreased considerably for 7734 in the second cycle. However, the herbage consumption tended to be similar between genotypes, and moreover, dry matter intake (DMI) tended to be higher for 7734 than for DL in the first cycle. Live-weight (LW) gain increased with grazing, averaging 0.79 kg/head/day with 19.42 g DM/kg LW/day of DMI. Therefore, the LW of breeding beef cows was at least maintained under rotational grazing without additional feed supply for 56 days in summer.

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