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CONCLUSION<br />
We have confirmed the insignificant effect of the β-Lg<br />
genetic variant on the nitrogen distribution in the milk<br />
protein and processing properties of milk. It must be also<br />
noted that the pleiotropic effect of the milk protein<br />
encoding genes on milk composition is probably relatively<br />
small and in many cases, due to fairly large genetic<br />
variation, it is difficult to prove. This is because milk traits<br />
are quantitative traits and in addition to genetic factors<br />
they are also affected by many environmental factors,<br />
which are often more responsible for variation than genetic<br />
makeup. By Mroczkowski et al. (2004) wide differences<br />
in the studies on the relationship between milk protein<br />
polymorphism and milk performance of sheep result from<br />
many factors, such as lack of genetic homogeneity of<br />
sheep representing different breeds, the related unequal<br />
frequency of genes that condition milk production,<br />
differences in the size of the analysed population, and<br />
different methods of milk yield determination.<br />
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