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Effects of grass height at a start of grazing season on herbage production and utilization under rotational grazing of lactating dairy cows



Effects of grass height at a start of grazing season on herbage production and utilization under rotational grazing of lactating dairy cows



Grassland Science 47(3): 269-273



Under rotational grazing of lactating dairy cows, effects of grass height at a start of a grazing season on herbage production and utilization were studied. Experimental pastures were two of 0.94 ha, and each was rotationally grazed by 6 lactating dairy cows for 5 hour everyday from May to October. Mean grass height at the start of the grazing season in each pasture was 15 cm (S15) and 20 cm (S 20). Herbage allowance was fixed through the grazing season, and daily paddock area was adjusted according to the each herbage yield. At June, grass height in S20 was higher than S15 (P<0.01), and leaf weight and intake in S20 tended to be higher than S15. The sheath length of grass and the amount of dead material in S20 tended to be higher than S15. From June to August, the herbage regrowth in both paddocks decreased, particularly decreased largely in S20. After July, the leaf proportion to the herbage mass in S20 tended to be lower than S15. From July to September, the intake in S20 tended to be lower than S15, while total herbage utilization in each paddock was 8.6 t DM/ha, respectively.

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