ORIGINAL PAPER
Associations between bovine milk protein
genotypes and haplotypes and the breeding value
of Polish Black-and-White bulls
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1
University of Warmia and Mazury in Olsztyn,
Department of Animal Genetics, Oczapowskiego 5, 10-957 Olsztyn, Poland
2
University of Warmia and Mazury in Olsztyn,
Department of Breeding Methods and Animal Improvement,
Oczapowskiego 5, 10-957 Olsztyn, Poland
Publication date: 2002-05-09
J. Anim. Feed Sci. 2002;11(2):205-221
KEYWORDS
ABSTRACT
One hundred forty three proven Polish Black-and-White bulls were genotyped for 6 polymorphic
sites located within 4 milk protein genes (LGB-R promoter, LGB exon IV, CASK-R promoter, CASK
exon IV, LALBA 5' flanking region and CSN1S1 promoter). All bulls were divided into groups,
including animals with the same genotypes, intragenic haplotypes and combinations of genotypes.
For each group, the arithmetic mean and standard deviation for Type Production Index (TPI) and
Predicted Transmitting Ability (PTA) (milk kg, protein kg, protein %, fat kg, fat %) were calculated.
These data were then used for analysis of variance to find possible associations between identified
polymorphic sites and TPI and PTA values. Significant differences (P<0.01) were found within
different genotypes of CASK, LGB, LALBA, intragenic haplotypes CASK/CASK-R, combinations
of genotypes CASK/LALBA, CASK/LGB, LGB/LALBA, CASK/LGB/LALBA and TPI. Within
these groups, the highest TPI value was found for bulls carrying the following genotypes: CASK/
LGB/LALBA AA/AA/PM, CASK/LGB AA/AA, CASK/CASK-R A A / M M , LGB/LALBA AA/
M M , LGB AA, CASK/LALBA A A / M M and LALBA M M . Also, associations between genotypes
and combinations of genotypes and PTA for protein kg, fat kg, fat % , protein % and milk kg were
found.
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