Journal of Applied Genetics

, Volume 49, Issue 1, pp 69–74 | Cite as

Associations between 2 paternal casein haplotypes and milk yield traits of Swiss Fleckvieh cattle

  • Martin H. BraunschweigEmail author
Original Article


Associations between casein haplotypes and milk yield traits of offspring from 5 Swiss Fleckvieh AI test bulls were investigated. The analysis was performed by using a daughter design, where each daughter inherited either paternal haplotype B-A1-A-A or B-A2-A-A for alleles of αs1-, β-, αs2- and κ-casein genes. The substitution effects of paternalCSN2 A1 versus A2 on protein yield deviations (YDs) were significant (P < 0.05), whereas their effects on milk and fat YDs were not. The paternal substitution effects of theCSN2 A1 versus the A2 allele on protein YDs within the 5 sires did not reach the significance level. This is due to the contrary allele substitution effect of a sire compared to the other 4 sires. The effects of maternal haplotypes on milk, protein and fat YDs were not significant. However, it is noteworthy that the effects of haplotypes with a low frequency in the population deviate largely from the most frequent haplotype B-A2-A-A. The effects of β-lactoglobulin (BLG) genotypes were significant for protein YDs but not for milk and fat YDs. The association between the paternalCSN2 A1 and A2 alleles and milk protein YDs within sires but not milk and fat YDs indicate an interaction, which might be a consequence ofCSN2 heterogeneity or a closely linked gene that is contributing to the estimated effects.


casein haplotype daughter design genetic variant milk yield trait Swiss Fleckvieh cattle 


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Copyright information

© Institute of Plant Genetics, Polish Academy of Sciences, Poznan 2008

Authors and Affiliations

  1. 1.Institute of GeneticsVetsuisse Faculty, University of BerneBerneSwitzerland

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