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The experiment was performed on 121 primiparous Polish Holstein-Friesian (PHF) cows and 36 primiparousJersey (JER) cows. The highest decrease in casein yield was noted in JER cows at 7.36 % on day 90 of lactation,15.95 % on day 150, 26.78 % on day 210, 37.01 % on day 270 and 39.67 % on day 330. In PHF cows thisdecrease was substantially lower, at 4.98 %, 7.65 %, 8.72 %, 10.50 % and 16.19 % respectively. The caseincontent of milk from primiparous PHF cows ranged from 2.38 % (LGB – day 60) to 3.09 % (LGB BB – day330), and it was found to be considerably lower in JER cows, varying between 2.35 % (CSN3 BB – day 30) and3.61 % (CSN3 BB – day 210). The highest casein yield was recorded in PHF cows with the following genotypes:LGB AA (day 60), CSN1S1 BB (day 60), CSN2 AB (day 270), CSN3 BB (day 150). In JER cows the highestcasein yield was noted on day 90 of lactation with respect to the following genotypes: LGB BB, CSN1S1 BC,CSN2 AA and CSN3 BB. In PHF cows the greatest effect on whey protein yield was exerted by the followinggenotypes: LGB AA (day 90), CSN1S1 BC (day 60), CSN2 AA (day 90); the CSN3 BB genotype influencedwhey protein yield in cattle of both breeds (day 90). In JER cows the highest daily yield of whey proteins wasobserved on day 90 of lactation, with regard to the following genotypes: LGB BB, CSN1S1 BC, CSN2 AB andCSN3 BB

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Yield and composition of milk from Polish Holstein-Friesian and Jersey cows in particular months of the first lactations as dependent on milk protein polymorphism (short communication)