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Vet's View: Stay vigilant against seasonal health problems

In the first of our new monthly series of ‘the vet column’ we talk to Rob Howe, from the Lancashire branch of Lambert, Leonard and May, about two seasonal health problems; E.coli mastitis and lungworm.

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Toxic mastitis is often referred to as ‘coli mastitis’ or ‘E.coli mastitis’ because in many cases the common environmental bacteria, Escherichia coli, is the causal bug, says Rob Howe.

“It is important to understand other bacteria can cause very similar signs with watery yellowish discolouration of milk and a hard quarter. Toxic mastitis is often very sudden in onset and the cow becomes very ill extremely quickly.”

 

Mr Howe adds E.coli causes the signs of disease when toxins are released from within the bug as the rapidly multiplying bacteria die. For this reason some vets argue that antibiotic therapy is not terribly relevant.

 

“Prompt treatment makes all the difference and should focus on aggressive use of fluids and anti-inflammatory products. Many dairy farmers are now equipped with the Aggers pump to ensure cows can be given large volumes of oral fluids quickly and relatively simply.”

 

He adds, in recent years there has been some research focusing on the use of vaccsines for the improved control of toxic mastitis.

Lungworm

The sharp rise in temperatures set the scene for the development of the most important cause of pneumonia in grazed adult cattle – lungworm or ‘husk’.

 

“Once we have a few wet days then lungworm larvae will start to move around on pasture and develop into their infectious larval stages.

 

“Cattle which have been turned out for their first grazing season in recent months are especially at risk as they are likely to have very little immunity to the infectious parasite which causes lungworm in cattle.”

 

Mr Howe warns it is now extremely common to see very mild signs of lungworm in older cattle too. “They may have a fairly decent level of immunity through exposure in previous grazing seasons, but when conditions favour the parasite, the numbers in a single bite can be massive.

 

“These very large larval challenges can overwhelm the grazing adult cow and she may start to show the occasional cough, some runny eyes or discharges from the nose. In most cases there is a pretty hefty milk drop too.

 

“Treatment is now pretty simple, with products available to kill the worms and which don’t involve discarding milk. However, the products are quite expensive and much more importantly the damage does not go away and the impact on long-term yield and future fertility can be profound.

 

“This is a classic case where prevention is very much better than cure and we would always recommend discussing the use of lungworm vaccine with your vet to ensure that long-term control of lungworm is maintained.”

 

What topics would you like to see discussed?

We would like to hear if there is anything you would like us to put to a vet - please email louise.hartley@farmersguardian.com with your comments or queries.

 

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