Any new grass has the potential to cause nitrate poisoning, which can occur from half an hour to four hours after starting to graze. A nitrate concentration of more than 0.2% of dry matter can cause this problem. Farmers should avoid putting hungry cows on new pasture, and carefully ration the amount available. If they call a vet as soon as noticing a problem, it can be cured with an intravenous injection.
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