Abstract
Milk fever is a production disease in which cows fail to mobilize enough calcium for lactation, especially at calving time. A predisposition to the disease occurs in older cows because the initial milk yield is greater and calcium metabolism slower. Treatment with calcium borogluconate is usually effective but relapses are common. Prevention can be achieved by correcting errors of the diet, by injecting massive doses of vitamin D3 or hormone preparations or by inducing mild acidosis with a feed additive.