Matějíček A. author Matějíčková J. author Štípková M. author Hanuš O. author Genčurová V. author Kyseľová J. author Němcová E. author Kott T. author Šefrová J. author Krejčová M. author Melčová S. author Hölzelová I. author Bouška J. author Frelich J. author text journal article 2008 The aim of this study was to determine the joint effects of CSN3 and LGB genotypes on parameters of production, quality and coagulation of milk in Czech Fleckvieh cows. Three hundred and twenty-eight Czech Fleckvieh cows were determined for CSN3 (kappa-casein) and LGB (beta-lactoglobulin) genotypes using the PCR-RFLP method, milk quality parameters and coagulation properties. Milk production parameters were obtained from the Official Database of Progeny Testing. Fifteen genotype combinations were detected, with ABAB (21.0%) and AAAB (18.3%) occurring as the most frequent. The observed genes significantly affected the contents of milk protein (crude protein, true protein, casein and whey protein) as well as solid non-fat in milk, casein number and curd quality. BBAA was found to be the genotype with the highest positive impact on most of the milk characteristics evaluated. Whereas ABBB, BBBB, BBAB and ABAB had a positive influence on milk quality and milk coagulation properties, genotypes containing CSN3 allele E had a negative effect. Results presented in this study are applicable in the selection of Czech Fleckvieh cattle. cattle; milk protein genes; kappa-casein; beta-lactoglobulin; milk production parameters; coagulation properties 10.17221/363-CJAS https://cjas.agriculturejournals.cz/artkey/cjs-200806-0003.php https://cjas.agriculturejournals.cz/artkey/cjs-200806-0003.php continuing 53 6 246 252 2008 12121819 periodical academic journal