Our objective was to compare herbage accumulation and nutritive value of Urochloa decumbens (Stapf) R. Webster managed under pre‐grazing canopy light interception (LI) targets of 90%, 95% and 100% in silvopastoral system (SPS) and 95% in open pasture (OP; U. decumbens under full sunlight) to establish a pre‐grazing target for SPS of ~43% shade. The evaluations were made during two rainy seasons and one dry season. The total herbage accumulation in SPS was lower than in OP at all LI targets and seasons. However, the difference in total herbage accumulation between SPS and OP was reduced when SPS was harvested at 95% LI, with reductions of 20% and 28% in both rainy seasons (12,191 × 15,324 kg DM/ha and 11,158 × 15,424 kg DM/ha respectively). Moreover, under 95% LI in SPS, crude protein concentration was 18% and 19% greater than that in OP in both rainy seasons (155 × 131 g/kg DM and 144 × 121 g/kg DM respectively), thus representing the optimal pre‐grazing LI target for U. decumbens in SPS. In addition, a canopy height of 20 cm was necessary for 95% LI in OP and a height of 40 cm in SPS. Therefore, U. decumbens should be grazed at 40 cm canopy height, in SPS with ~43% shade to keep 95% LI as the target. However, this target will only be effective if the shade level is maintained, which will reduce height variation over time.

中文翻译：

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旋转放养的家畜-牧草系统中Urochloa decumbens（Stapf）R. Webster的放牧管理策略

我们的目的是比较在草食牧系统（SPS）中放牧前冠层光截获（LI）分别为90％，95％和100％，在草食牧系统（SPS）中为95％的放牧前目标管理下的草och（Stapf）R.露天牧场（OP; U. decumbens在充足的阳光下）为SPS设定约43％阴影的放牧前目标。在两个雨季和一个旱季进行评估。在所有LI目标和季节中，SPS中的总牧草积累均低于OP中的牧草积累。但是，当SPS收获在95％LI的条件下时，SPS和OP之间的总牧草积累差异减小了，在两个雨季（12,191×15,324 kg DM / ha和11,158×15,424 kg DM /哈分别）。此外，在两个雨季（分别为155×131 g / kg DM和144×121 g / kg DM）的SPS中，LI含量低于95％时，粗蛋白浓度分别比OP中高18％和19％。放养U的放牧前LI指标在SPS中。此外，OP中95％的LI需要20 cm的顶篷高度，而SPS中40 cm的高度需要顶篷高度。因此，应该在40 cm的树冠高度放牧U. decumbens，在〜43％的阴影下以95％的LI作为目标。但是，此目标只有在保持阴影级别的情况下才有效，这将减少高度随时间的变化。