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Abstract
Extract
An outbreak of nitrate poisoning in dairy cows eating redroot (Amaranthus retroflexus) and tops of immature turnips was recently reported by Brakenridge (Citation1956). Bradley, Eppson, and Beath (Citation1940) suspected that several head of cattle had died through eating hay composed mostly of redroot, but nitrate poisoning was not confirmed, although they did establish that the weed contained toxic amounts of nitrate. No other reports of nitrate poisoning by turnip tops are known. Previously in New Zealand, McIntosh (Citation1949) recorded nitrate poisoning in cattle which had grazed on variegated and winged thistle and in swine fed mangolds incorrectly cooked.