Wheatbelt livestock producers with lupin stubbles are urged to monitor flocks for signs of the liver disease, lupinosis, following widespread rainfall in November.
There have been several reports of the disease in sheep flocks, particularly in the southern region, where lupin crops are increasingly being sown for grazing as a standing crop.
Department of Primary Industries and Regional Development (DPIRD) field veterinary officer Judy Burson recommended producers check sheep regularly for signs of lupinosis and take prompt action, if the disease is suspected.
“Lupin crops or stubbles are a valuable feed source but need careful management,” Dr Burson said.
“Early signs of lupinosis can be subtle and include reduced appetite and loss of condition, disorientation and lethargy when driven, and individuals not keeping up with the mob or staying near water points.
“More severe cases show disorientation, blindness or head pressing behaviour, a hunched appearance and yellowing of the membranes around the eyes and in the mouth.
“Stock showing symptoms should be removed from the paddock immediately and advice sought from a veterinarian to diagnose the illness.
“The earlier action is taken, the less affected the flock or herd will be.”
Lupinosis is mainly caused by the consumption of lupin stubble that contains the fungus Diaporthe toxica (previously called Phomopsis leptostromiformis).
While modern narrow leaf lupin varieties typically have phomopsis resistance, these strains can still develop the disease under suitable conditions.
Dr Burson said affected livestock would need additional care, after they have been moved to new paddocks.
“Stock are best moved to a small paddock, with plenty of shade and water for a couple of weeks,” she said.
“Provide quality hay with small amounts of oats, if needed, but not lupins, as the damaged liver is unable to process a high protein diet.
“It can take up to six months for some animals to fully recover.”
Professional diagnosis by a veterinarian is recommended, as lupinosis symptoms can be similar to other diseases, including diseases exotic to Australia.
Subsidies under the Significant Disease Investigation Program may be available for investigations that exclude emergency diseases to aid early detection.
To find out more contact your private veterinarian or a DPIRD field veterinarian.
Details on lupinosis identification and management are available on the Lupinosis webpage.
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