1/2006 - Potravinárstvo

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