Relationship between kappa-casein A and B variants versus citrate content of milk quantified by capillary electrophoresis
1997
Braunschweig, M. | Puhan, Z. (Swiss Federal Inst. of Technology, Zurich (Switzerland). Lab. of Dairy Science)
In this study the milk of cows with known genetic variants of protein was quantified for citrate content by capillary electrophoresis (CE). From seven test-bulls of the breed Braunvieh (BV) and their crosses with Brown Swiss (BS), having the combination of casein haplotypes BABA and BABB for the variants of a alphas1-, alphas2-, beta- and kappa-casein, respectively, 143 daughters were selected. They were assigned to two groups according to the casein haplotype they inherited from the sire. During the first lactation, two milk samples, that is, between 30-80 and 170-215 days, were analysed for citrate content. From the data obtained, no influence of the casein haplotype on the citrate content was found. The same applied when the cows were grouped according to kappa-casein genotype AA, AB and BB. A significant (p less than 0.05) negative correlation (-0.21) was found between the content of citrate and the logarithm of somatic cell count (SCC); however, only for the interval 30-80 days. The citrate content in the second interval between 170 and 215 days was significantly lower than in the first interval of lactation.
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