Novartis Animal Health is warning livestock producers to keep an eye on the weather, because wet conditions are ideal for fluke to thrive and pose real challenges to cattle and sheep this year, even in areas where there has been little risk before.

Novartis Animal Health veterinary adviser Saul Harvey said: "We are approaching the main season for fluke and with the changes in weather patterns and two previous wet seasons, there is a serious risk of an increase in the fluke challenge this year. The wet spell will also increase worm challenge on pasture as increased moisture allows worm larvae to migrate away from dung pats to be ingested by stock."

Mr Harvey said there were already definite signs of snail activity in regions much further east than before: "The recent rains and warm temperatures at up to 2^o centigrade above normal in some parts of the UK will kick off the fluke cycles this year.

"In cattle, liver fluke can lead to falls in milk yield of 500g / day over a 305-day lactation, as well as reduced weight gains of up to 1.2 kg a week in growing cattle. A flukicide that kills all three stages of fluke including immatures should be used in this high risk period, such as Fasinex 240 which is a low volume concentrated formulation and can be given through the floating hook doser for ease of administration.

"Liver fluke also affects the condition and growth of sheep and often leads to "sudden death" in acute cases. The first indication of fluke in sheep may come after slaughter at the abattoir, where damaged livers are often condemned due to liver fluke damage. To avoid these problems a flukicide such as Novartis's Fasinex, that kills all three stages of fluke - early immature, immature and adult - should be used. Fasimec Duo S, with ivermectin, should be used if worm control is also required."

Mr Harvey advised cattle farmers to dose their cows with a flukicide two weeks after they had been housed to clear out all the fluke ingested by the livestock while they were out grazing infected pastures. He said: "It is particularly important that they use a product like triclabendazole (in Fasinex 240) that will kill all stages of fluke after housing, because using an adult-only treatment will leave immature fluke around to continue to cause liver damage and that will affect productivity over the winter period."

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