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Liver fluke symptoms6/17/2023 ![]() Triclabendazole-resistance has also led animal health company Virbac Australia to create two products, which are effective even against triclabendazole-resistant strains. Invetus has lately been involved with the identification of triclabendazole-resistance on cattle properties, as well as the implementation of new control programs – and Michael says that this has “allowed farmers to obtain much better fluke control, reducing the negative impacts on the cattle and bringing down the overall prevalence of liver fluke on a property.” While triclabendazole was introduced as the main drench treatment 30 years ago, triclabendazole-resistance can be a challenge for farmers wanting to protect their herd. This, combined with using drenches at strategic times of the year, such as autumn – as well as knowing via monitoring what fluke drenches work on each property – are all crucial for effective fluke control.” “Keeping animals out of swampy areas with fencing helps to break the liver fluke lifecycle. There’s another reason why treatment at this time is so helpful, as Michael continues: “Treatment now will also ensure that animals are not carrying a fluke burden over winter, when pastures can be of low quality and quantity.” Make sure you're controlling all stages of fluke including the dangerous 2 week old flukeįarmers can take various steps to help control liver fluke at this time – one of which being the importance of good grazing management. Michael also points out that tackling the problem now “will also ensure that animals don’t need to be treated so often, which is often the case with products that only target the adult stage of fluke.” This immature stage of the parasite is the most destructive to cattle, as the fluke migrate through the liver, causing hemorrhaging and scarring along the way – so it’s vital to begin treatment before they can do too much damage.” “Autumn is the best time to begin treatment, as it’s when the largest amount of immature fluke are found in the animal. Most of the damage is caused during the earliest stages of the parasite's development, as it travels through the animal's liver – and its impact can cause significant losses, with an estimated $50-$80 million per year in productivity losses alone 1.Īs Michael explains, early May is the optimal time to treat cattle, as this is when liver fluke are most likely to be maturing to two weeks old – which is its youngest treatable stage: Liver fluke infects cattle and sheep, but often goes undiagnosed because it shows no obvious signs or symptoms.
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