Zbigniew Dorynek

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This study investigated the impact of 6 polymorphisms located in theABCG2, PPARGC1A, OLR1 andSCD1 genes on estimated breeding values for milk production, longevity, somatic cell count and reproductive traits. The analysis was conducted on 453 Polish Holstein-Friesian bulls. Genotypes were identified using PCR-RFLP, and haplotype inferences were performed(More)
Investigation was conducted on 219 Jersey cows. LEPR genotypes were established with the PCRRFLP using the TaqI restriction endonuclease. The frequencies of the threonine encoding C allele and the methionine encoding T allele were 0.79 and 0.21, respectively. The across-families analysis did not revealed any significant effect of the LEPR T945M polymorphism(More)
Twinning in cattle ranges from about 1% for beef breeds to about 4% for dairy breeds. The incidence of double births may have both positive and negative effects, which mainly depends on the purpose for which the cattle are raised. Because of freemartinism, as well as management problems connected e.g. with a greater risk of dystocia and retained placenta,(More)
The aim of the study was to analyse the K232A polymorphism in the acyl CoA:diacylglycerol acyltransferase gene (DGAT1) and to estimate the effects of lysine (K) and alanine (A) encoding variants on milk yield and composition in cattle. A total of 100 Jersey cows was tested for DGAT1 genotypes using the PCR-RFLP technique. The K and A allele frequencies were(More)
0. 36 (s h2 = 0.172 ) for three year old trotters and h 2= 0.25 (Sh E = 0.4 8) over all age groups. The expected selection response after selection on racing performance of three year old stallions and mares has been calculated. It amounts to 2.03 seconds per generation if selection is only applied on the male path, and 2.57 seconds per generation after(More)
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