This thesis was developed to study the influence of polymorphic variants of the milk protein locus betacasein (BCN) on the production and technological quality of the milk. The genotypes of -casein (CSN2 gene) were determined by the PCR-RFLP analysis. The determination of genotypes AA, AB and BB was made in 731 dairy cows. The results of genotype frequencies showed that genotype BB represented roughly five times more frequently than the heterozygotes AB and thirty times more frequently than AA homozygotes in the population under study. The effect of the BCN genotypes on the production and composition of milk was analyzed in 418 samples. No statistically significant effect of genotypes or alleles was found in this section. Subsequent analysis of the influence of genotypes and allele on the coagulation and the determination of titratable ability of the milk was performed on 119 samples. The results did not confirm a statistically significant effect on milk coagulation. The yogurt test showed genotypic effects. This could mean that genotype AA is associated with higher milk acidity and AB genotype with lower. However, the results could be affected by lower frequency of the population and an uneven frequency of genotypes in the population surveyed.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:375813 |
| Date | January 2018 |
| Creators | ŠVARCOVÁ, Monika |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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