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Beware of summer mastitis: What British farmers need to know

A beef expert at Scotland’s Rural College has highlighted the importance of checking cattle following reports of large numbers of summer mastitis cases.

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Beware of summer mastitis: What British farmers need to know

Senior beef consultant, Dr Basil Lowman, of SAC Consulting – part of SRUC – says: “In most parts of the country it has been an exceptional year for grass growth, but this unfortunately means it has also been an exceptional year for flies – the carriers of summer mastitis.

 

“Although everyone is flat out trying to bring in the harvest, it is essential livestock farmers pay careful attention when checking cows.

 

“Animals away from the main group, hungry calves, and swollen teats and udders, are obvious signs of a problem which needs immediate investigation, as the earlier the problem is identified, the greater the chance of saving the area.”

 

He explains the animals most at risk are dry cows, but with levels of infection so high this year, cases are occurring in heifers and even the occasional stock bull and steers.

 

Susceptible

 

He also said while cows with calves are not considered to be at risk of summer mastitis, they can become susceptible within two to three months of calving, when they dry themselves off by preventing the calf suckling.


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“The most important thing to do is to graze susceptible animals in exposed fields away from trees and open water where flies breed.”

 

Once a case of summer mastitis occurs, the level of infection carried by flies increases dramatically as they land on an infected area and then fly off to a neighbouring cow.

 

“The best way to avoid this is to bring all infected cows indoors, which will be necessary in any case if they are to be treated,” says Dr Lowman.

 

How to prevent flies settling on cattle

 

  • Consider the use of teat sealants. It is essential the end of the teat is carefully cleaned and disinfected before the tube is inserted
  • Stockholm tar, an old-fashioned remedy, can be used to form a physical barrier over the end of the teat. However, it is difficult to apply and to be effective and needs replacing weekly; an alternative is to use polyurethane varnish as a teat dip
  • There are a number of spray products on the market aimed at deterring or killing flies
  • Insecticide eartags can be used, but for best effect they need to be applied in early spring to kill as many flies as possible while numbers are relatively low
  • A naturally occurring sulphur compound in garlic seeps out of the animal’s pores and sweat glands and acts as a repellent to flies and other biting insects
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