Mastitis is a major constraint to milk production throughout the world (Blosser, 1979). Its incidence has not diminished through the years in spite of intensified programmes of prevention and treatment (Young et al., 1982). The causes of bovine mastitis are numerous among which several species of infectious agents participiate; staphylococci, streptococci, E.pyogenes and Gram negative organisms such as E.Coli are the most common causal bacteria. In general mastitis is considered to be an environmentally induced infectious disease. However, genetic variation in susceptibility to mastitis has been shown, although the estimates of its magnitude has varied considerably.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 368-371, 1982
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