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Stackyard News May 06

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Cut The Fly Threat By Treating Cattle Early This Season, Experts Say

Seeing large numbers of flies on animals or observing cows kicking in the parlour are the main triggers for applying summer insecticide products farmers say, but this can be too late for optimum fly control on many farms.

‘Do not wait until you see flies on your animals before reaching for the insecticide – treat cows early to cut fly populations’
‘Do not wait until you see flies on your animals before reaching for the insecticide – treat cows early to cut fly populations’

According to an independent survey of 100 dairy farmers commissioned by Schering-Plough Animal Health and carried out at the end of the 2005 fly season, 44% of farmers reach for the insecticide first only when they see flies on their cows. Another 43% only when they see flies in the parlour or cows kicking. Only 12% plan fly treatments based on weather conditions.

But Dr Peter Bates, senior entomologist with the VLA, says that pre-empting the fly threat this summer will help reduce fly-borne disease problems later in the season.

“Applying insecticide early in the season will both reduce current fly attack and cut next generation numbers. If you can kill flies early or even stop them feeding on your cattle, you reduce their ability to breed. If a fly doesn’t eat, it doesn’t develop reproductive organs.

“For example, one of the main flies that dairy farmers really have to worry about is the head fly and the culprit known to transmit summer mastitis. It is widespread in the UK and one breeding cycle is enough to produce swarms for the whole summer season,” he points out.

“Adult flies emerge in early June and lay eggs from July onwards. The larval stage then acts as an adult reservoir, so if you can reduce the number of adults before they start laying eggs there will be lower fly numbers for the following year.”

Schering-Plough livestock veterinary adviser Paul Williams advises farmers to apply insecticide early and consider two to three applications of Coopers Spot On a season. “Trials at Bristol University have confirmed the efficacy of Coopers Spot On in terms of reducing the numbers of flies on cattle. It’s easy to use and works effectively because the use of an oil-based carrier for the deltamethrin active ingredient ensures it starts killing flies over the whole body. Studies show flies being killed on the head, belly, legs and rump within two hours of a single, 10ml spot application on the back of the animal,” he points out.

link Leading Pneumonia Antibiotic Gains License For Preventive Use
link Worm Cattle For Economic Growth This Season
link Protect heifers from bovine leptospirosis
link No Resistance Is Main Pneumonia Antibiotic Prescription Criteria

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