Dried tansy ragwort, which contains pyrrolizidine alkaloids (PA), was fed to lactating dairy goats. Milk containing 7.5 ng of PA/g (dry weight basis) from these goats was fed to rats and calves. Rats fed a goats' milk diet for 180 days with a calculated total PA intake of 0.96 mg/rat had swollen hepatocytes of centrilobular distribution, and biliary hyperplasia, indicating PA involvement. Rats fed tansy ragwort at dietary levels of 1%, 0.1%, 0.01% and 0.001% (corresponding to PA intakes of 39.77, 5.04, 0.52, and 0.05 mg/rat) showed swollen hepatocytes, megalocytosis, biliary hyperplasia, and fibrosis. The histopathologic changes in the milk-fed rats and those given 0.001% tansy ragwort in the diet were similar. Definitive changes in 2 calves fed goats' milk were not detected. The results with rats indicate that PA are transferred in goats' milk and may produce hepatoxic effects.
|Original language||English (US)|
|Number of pages||3|
|Journal||American journal of veterinary research|
|State||Published - Sep 1982|
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