Recent achievements in specificity of lysozyme gene organization and expression made it possible to consider lysozyme as a candidate gene for natural resistance in cattle. In our research affort on more than 10 000 animals reared in large herds were examined. Obtained results were the background for determining genetic basis of lysozyme activity differentiation. The aim of present investigation was to trace out high lysozyme activity (LZM+) animals. This was achieved by pre-se!ecting animals on the basis of quantitative analysis of lysozyme activity measurements and verification by single gene allelic segregation. Generally, a very low frequency of LZM+ carriers were identified in a random sampling population. However two sires and some dams were recognized as LZM+ heterozygote. Independent to sex, age and other conditions, the progeny groups alternatively inherited very high or normal lysozyme activity were stated. The obtained results were applied in the experimental breeding program to gain information on the relationship between lysozyme polymorphism and natural resistance specificity in cattle.
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