Leucocyte Screening Tests and Dairy Herd Improvement

Mastitis varies in its effect on the mammary gland from mild irritation to almost complete destruction of the secretory tissue. Dairymen can usually detect clinical mastitis by the appearance of the milk or udder swelling and are aware of losses caused by acute stages of this disease. Early infections and subclinical cases are more difficult to detect and the unrealized losses in production are harder to recognize.