Abstract
Milk protein variants for beta casein (β-CN), kappa casein (κ-CN), and beta lactoglobulin (β-LG) affect different properties in milk influencing milk product manufacturing. The impact of selection on such variants on milk production in Irish Holstein-Friesian cows is, however, unknown. Mixed models were used to determine the associations between milk production and milk protein genotypes for β-CN, κ-CN, and β-LG in 13,095 lactation records from 5,431 cows. Presence of the β-CN A1A3 and A2A3 genotypes were associated with a greater milk yield, while the β-CN II and A2A3 genotypes were associated with a greater protein yield and concentration. The β-LG AA and BB genotypes were associated with a lower and higher fat concentration, respectively, relative to the AB genotype. The κ-CN AE and β-LG BB genotypes were both associated with a lower protein yield and a lower protein concentration.
Published Version
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