Dry matter (DM) production of multispecies swards compared to perennial ryegrass (Lolium perenne; PRG) swards under intensive grazing warrants investigation as it is relatively unknown. A 5 × 2 factorial experiment, with five sward types and two defoliation methods, was used to investigate the effect of grazing versus cutting on dry matter (DM) production of multispecies and PRG‐only swards. Five sward types were established namely: a PRG‐only sward, receiving 250 kg N ha⁻¹ year⁻¹ (PRG250), and a PRG‐only sward (PRG90), a two‐species sward with PRG and white clover (Trifolium repens; PRGWC), a six‐species sward (6S) and a nine‐species sward (9S), each receiving 90 kg N ha⁻¹ year⁻¹. Cutting plots measured 1.95 × 10 m and grazing plots measured 10 × 10 m. All plots were harvested concurrently every 21–30 days from April‐November for two years (2015 and 2016). A strip from the grazing plots was cut for DM yield determination prior to turning in cattle for grazing. There was an interaction between sward type and defoliation method (p < .01), whereby there was no effect of defoliation method on the PRG‐only swards, however, the annual DM production of PRGWC, 6S and 9S swards reduced under grazing compared to cutting (p < .001; on average 1,929 kg DM/ha lower). Multispecies swards had lower DM production under grazing compared to cutting, while the DM yield of PRG‐only swards was unaffected by defoliation method.

中文翻译：

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放牧与砍伐对多品种和多年生黑麦草单季干物质生产的影响

与多年生黑麦草（Lolium perenne ; PRG）的草相比，多品种草的干物质（DM）生产在严格放牧的情况下需要进行调查，因为这是相对未知的。进行了一个5×2阶乘实验，其中有五种类型的草地和两种脱叶方法，用于研究放牧与cutting割对多物种和仅含PRG的草地干物质（DM）生产的影响。建立了五种类型的草地：仅PRG的草地，接受250 kg N ha - ¹ 年^-1（PRG250），仅PRG的草地（PRG90），带有PRG和白三叶草的两类草地（Trifolium repens ; PRGWC），六种草皮（6S）和九种草皮（9S），每一种都接收90千克N ha - ¹ 年^-1。割地测量为1.95×10 m，放牧地测量为10×10 m。从4月到11月，每21-30天要同时收获所有田地，为期两年（2015年和2016年）。在将牲畜放牧之前，从牧场上切下一条条用于确定DM产量。草地类型与落叶方法之间存在交互作用（p  <.01），因此落叶方法对仅PRG的草地没有影响，但是，放牧条件下PRGWC，6S和9S草地的年度DM生产量比切割（p  <.001；平均每公顷低1,929千克DM）。与放牧相比，多品种草地在放牧条件下的DM产量较低，而仅PRG草地的DM产量不受落叶处理的影响。