Cat Specific Bait Poison

Subject: Cat Specific Bait Poison
From: Jim Smart <>
Date: Fri, 05 Aug 2005 10:48:34 +1000
Good news in the war on cats:

New toxic bait that looks like cocktail sausages could stop feral cats from killing Australian native wildlife.

The bait is made of kangaroo meat and chicken fat laced with a chemical that's poisonous to cats yet is less likely to harm native animals.

It puts feral cats to sleep, killing them within an hour by a process similar to carbon monoxide poisoning.

"It's very rapid and seems to be a very peaceful process," says team member Michael Johnston, a research scientist with Victoria's Department of Primary Industries.

Cats were brought to Australia by settlers and by the 1850s there were feral cat colonies in the wild. Cats were also deliberately released in the late 1800s to control rabbits, rats and mice.

There are now millions of feral cats around Australia, pests that have caused native animals to become extinct on some islands, and have threatened ground-dwelling birds and mammals on the mainland.

Current ways of protecting native animals from cats in Australia's national parks like shooting, trapping and fencing are too expensive to be used over large areas, says Johnston. So he says baits are necessary.

One of the challenges in baiting pests is making sure that native animals are not affected.

Johnston says he has dredged the literature to find a toxicant, called para-aminopropiophenone (PAPP), which was once used by the military but could now become a cat-specific bait poison.

PAPP can be used to treat human radiation sickness and cyanide poisoning. But in cats it induces a lethal case of methaemoglobinaemia, in which the blood's haemoglobin is oxidised to a form that cannot carry oxygen.

Johnston says tests on feral cats in the laboratory show that within 20 minutes the animals become lethargic, are unconscious within 40 minutes and dead within an hour.

"It's something that we think is a very humane method," he says.

Johnston says evidence from the literature shows cats are more highly susceptible to developing methaemoglobinaemia than other animals, making PAPP a good candidate for bait.

"Brushtail possums are 90 times less susceptible than cats to PAPP," says Johnston. "So there is a significant margin there."

Colleagues from the Pest Animal Control CRC in Canberra are testing the possible use of PAPP baits on wild dogs and foxes, and will also be further testing the chemical's impact on Australian native wildlife.

The researchers also hope that formulating the poison as large hard pellets will reduce the chance native animals will eat it.

This is because while cats tend to swallow their food whole, native animals tend to chew their food very carefully and are likely to spit out the poison pellet when they find they can't chew it.

Another challenge the researchers face is finding a bait that will interest cats, which don't generally eat dead flesh.

Western Australia's Department of Conservation and Land Management has identified kangaroo and chicken fat as key ingredients for an attractive bait, says Johnston.

It has also found the baits are best laid in the winter when there is less alternative food around for the cats and they are using a lot of energy.

Johnston hopes to see field trials of the bait before the end of the year.

Jim Smart
East Maitland

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