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Pasture of low dry matter content (DM%) can occur in northern New Zealand. From 17 years of monthly pasture sampling on one farm at Kerikeri the DM% in regrowth was equal to or below 13% in more than half the samplings from April to June for ryegrass and ryegrass-kikuyu pastures. The DM% of pasture samples collected just before grazing were below that of regrowth samples (from cages) from April to September, but were higher than these from October to March. This effect was also seen in 9 years of pasture sampling at No. 2 Dairy at Ruakura (near Hamilton in Waikato). During April 1995, DM% of pastures sampled from Awanui in the north to Galatea in the south varied widely from 6 to 15%. Monthly pasture sampling from 2003 on a Ruakaka farm showed a similar seasonal pattern to the Kerikeri farm. On the Ruakaka farm, annual ryegrass pastures had low DM% both in regrowth as well as just before grazing (8% vs 11% in perennial ryegrass). Plantain-ryegrass-clover pastures had consistently 3-6% lower DM% compared with older ryegrass pastures. Factors such as weather, pasture species, and nitrogen fertiliser applications may contribute to low pasture DM% in Northland; this could restrict dry matter intake of cows grazing these pastures and hence milk production. Grazing management and choice of supplements might need to reflect the possible existence of pastures with a low DM%.

Low dry matter content of northern dairy pastures