Chemical residue exposure kills Wodonga cattle

Some might even be thinking about letting cattle into places like an old dip site or the farm rubbish tip.

Agriculture Victoria veterinary officer Lydia Nicholson said before farmers swung open the gate, it was worth taking a moment to consider what might be lurking in these spots, and whether they were really safe for grazing.

“Stock can readily pick up residues if they have access to localised areas of high-level contamination,” Dr Nicholson said.

“A recent case near Wodonga served as a sobering reminder of how easily well-intentioned actions can pose serious risks to livestock.

“During a disease investigation, several cattle were found dead after displaying severe neurological signs — staggering, blindness and collapse.

“Post-mortem examinations and laboratory testing were conducted, but the key breakthrough came during a discussion with the landholder.

“It was revealed that a bonfire had recently been lit on the property, and the burn pile included treated timber.”

Treated timber — commonly used in fencing, yards, and landscaping — is often preserved with copper chrome arsenate, a chemical that protects wood from rot and pests.

Dr Nicholson said CCA contained arsenic, which became significantly more toxic when the timber was burnt.

Even small pockets of contamination can lead to fatal consequences when stock gain access.

Meat processors routinely test for chemical residues, and if any carcase exceeds the Australian maximum residue limit , it is condemned for human consumption.

As the vendor, farmers may also be held legally liable.

Common risk areas include:

Dr Nicholson said if farmers were unsure, Agriculture Victoria held historical records of known contaminated sites.

For further information, contact your local veterinarian or Agriculture Victoria veterinary or animal health officer.