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What is mastitis?

Mastitis, an inflammation of the mammary gland (udder), is one of the most common reasons for culling ewes in sheep flocks. Mastitis is usually due to a bacterial infection but can also have non-infectious causes such as injury. It can occur any time in the production cycle of the ewe but is most common two to four weeks post-lambing. It can prove costly for breeders. In general, it usually occurs in animals raising more than one lamb or with an excessively high rate of milk production.
 
 Some cases occur when sheep are being grazed at too high a stocking rate, though the vast majority of all mastitis cases in sheep occur within a few weeks of lambing or just as weaning is due to start  The infection occurs when bacteria make their way into the udder of the ewe. It is most common in breeds that produce multiple offspring per lambing.
 
 Forms of the disease
 There are two main types of mastitis in sheep. Mastitis can be classified as clinical and subclinical. 
 
 Subclinical mastitis is a difficult one to identify and ewes tend to only show low growth rates when affected. Poor weather and a lack of adequate nutrition can cause subclinical mastitis to develop into clinical mastitis. Subclinical mastitis can also cause the death of twin lambs.
 
 Clinical mastitis refers to an infection that becomes obvious clinically. Mastitis can rapidly progress, eventually turning parts of the udder black, if the infection becomes severe enough to compromise the blood supply to the udder. Ewes usually appear lame and weak, with lambs also lethargic and depressed. Lambs can die because of a lack of milk when ewes have clinical mastitis and they can die from the infection gained from digesting the infected milk. Euthanasia may be considered in severely affected animals but best to consult your vet for advice.
 
 

Picture shows clinical mastitis.

 When treating mastitis, early detection is key and can prevent further spreading of the infection. Your Vet may provide you with an antibiotic and painkiller for your animal. or may make other treatment suggestions. Some cases of mastitis are due to yeast or fungi and giving these animals antibiotics makes them worse. It is important to get a diagnosis and treat appropriately.   It is a good idea to mark all ewes once treatment occurs, so they can be identified for possible culling at weaning. 

What causes it?

The primary cause of mastitis in cattle, goats and sheep are well-recognized groups of microorganisms, Streptococcus sp., Staphylococcus sp., Pasteurella sp. and coliforms, Escherichia coli, Enterobacter sp., and Klebsiella sp. Yeast and fungus have also been found frequently infecting the udder, but usually go unnoticed because they produce a mild or subclinical mastitis.

Picture shows severe mastitis resulted in an erupted udder 

How to treat it?

Disinfect the teat end with chlorhexidine or iodine-based disinfectants and infuse a tube of mastitis antibiotic through the teat canal if the cause of the mastitis is a bacterial infection.  If the problem is a bacterial infection the ewe can be give an injection of an antibiotic and nonsteroidal anti-inflammatory drug as directed by your vet.

The udders of ewes should be examined physically for hard lumps after weaning and before breeding. Ewes with ‘lumpy bags’ may be considered for culling. The milk supply of these ewes will be decreased, and the amount

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