Mastitis continues to be a problem for dairy producers, afflicting 15–20% of cows worldwide. We look at controlling mastitis through feed strategies.
Mastitis causes economic loss due to treatment costs, lost quarters, potential animal deaths, and, most importantly, discarded milk. Management strategies can have a large impact on the prevention of mastitis. However, there is growing evidence that nutrition can have significant effects on the immune system, thereby affecting infection rate and severity of mastitis. The following is a review of the nutritional factors to be considered for the control of mastitis.
Poor quality silage negatively affects the immune system of the animal. The overheated proteins and sugars may kill the white blood cells protecting the udder. Cows that are fed on hay and grain have greater resistance to several pathogens than cows fed on poorly fermented silage. Pseudomonas and Proteus can survive even the high temperatures produced in silage. Silage contaminated with these microbes may then be a source of mastitis. Even mouldy hay and mycotoxins may destroy white blood cells and therefore weaken the immune system.
Legumes, particularly alfalfa, are high in oestrogenic substances whose concentration varies depending on plant maturity. Turning these legumes into silage does not reduce the oestrogenic properties that are responsible for fostering mastitis. Intake of a large quantity of oestrogenic legume encourages premature development of the udder tissue and also increases the incidence of environmental mastitis.
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It is suggested that cows suffering from mastitis should be fed reduced quantities of concentrates. In a study conducted on 1,038 first-lactation cows and 572 cows of successive lactations, it was reported that when the cow rations contained 25% concentrates rather than 40%, the incidence of mastitis was 7% compared to 36% for first-lactation cows and 19% compared to 37% for other cows. The same study also compared different energy levels in rations. A ration with high energy content had increased chances of mastitis in the first lactation, while it had the opposite effect on the dry cows.
The immune response can include antibody production and cellular proliferation, both of which require protein. In support of this view, beneficial effects on the immune function have been obtained when infected cows were infused with 300g of glutamine per day. It is, however, argued that protein deficiency is short-lived because:
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Inadequate calcium to phosphorus ratio in rations results in problems with milk fever at calving. If the diet is lacking calcium, up to 50% of animals will develop coliform mastitis a few hours after calving. This hypocalcaemia which develops during dry periods generally results from inadequate calcium to phosphorous ratio in rations.
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Not only can nutrition have a direct impact on immune function and susceptibility to mastitis, but it can indirectly increase cow susceptibility to mastitis through its impact on other diseases. Some nutrients can induce one or more metabolic diseases when either deficient or in excess in the transition diet. Milk fever, for example, has been shown to slow the closure of the teat sphincter, thereby making the udder more prone to microbial invasion. Cows with milk fever are 8.1 times more likely to have mastitis and 9 times more likely to have coliform mastitis as a result. Mastitis is also associated with ketosis and retained placenta, and fatty infiltration of the liver is slower in clearing E. coli from the mammary gland of the cow. Much of these disease problems can be alleviated through proper nutrition and management strategies which, in turn, help control mastitis.
References are available upon request.