Effects of feeding lupin seed naturally infected with Phomopsis leptostromiformis to sheep and pigs

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Abstract
Lupin seed, 10% of which was naturally infected with P. leptostromiformis was obtained from 2 different sources and stored either conventionally, or in a warm and humid environment, for 45 wk. Only very low levels of toxicity were apparent during the storage period and in the warm, humid environment the level of infection of P. leptostromiformis was gradually reduced and eventually eliminated. The 2 batches of infected seed and non-infected lupin seed were fed to sheep as sole rations for 40 wk or as part of feedlot rations for 10 wk, and to baconer pigs as part of grower and finisher rations for 16 wk. In the 40 wk feeding trial mild lupinosis developed in sheep fed from 1 batch of infected seed, but there was no evidence of lupinosis in sheep fed the feedlot rations or pigs fed the grower and finisher rations. Lupin seed with levels of Phomopsis infection of up to 10% could possibly be safely fed to sheep and pigs under commercial conditions.