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1

New SSCP polymorphism within bovine STAT5A gene and its associations with milk performance traits in Black-and-White and Jersey cattle

100%
Brym P., Kaminski S., Rusc A.
Journal of Applied Genetics
|
2004
|
vol. 45
|
issue 4
445-452
EN
Milk protein genes expression in cows' mammary epithelial cells is regulated mostly by the action of prolactin mediated through the STAT5A transcription factor. The STAT5A gene is a potential quantitative trait locus (QTL) and genetic marker of production traits in dairy cattle. The sequence of the bovine STAT5A gene was analysed in this study to investigate if mutations in this sequence might be responsible for quantitative variations in milk yield and composition. Ten PCR fragments representing most important functional domains of STAT5A were screened for polymorphism. Using the SSCP method a new SNP (A/G) was found, located in intron 9 at position 9501 (GenBank AJ237937). The frequencies of alleles were estimated in 186 Black-and-White cows (0.52 and 0.48 for A and G, respectively) and in 138 Jersey cows (0.58 and 0.42 for A and G, respectively). For Black-and-White cows with different STAT5A genotypes no significant associations between STAT5A genotypes and milk performance traits were found. Statistically significant differences in the first and second lactations for milk yield, fat and protein content were found in Jersey cows. Cows with the GG genotype showed the highest milk yield, while cows with genotypes AA and AG showed higher protein contents when compared to cows with the GG genotype. Interestingly, cows with genotype AG showed significantly higher protein yields in comparison to cows with the AA genotype. For fat content, cows with genotype AA showed the highest level of this trait in the 1st and 2nd lactation. Further studies are necessary to evaluate an allele substitution effect in the population of sib-families of STAT5A heterozygous bulls.
2
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Polymorphism and expression of the tumor necrosis factor receptor II gene in cows infected with the bovine leukemia virus

100%
Stachura A., Brym P., Bojarojć-Nosowicz B., Kaczmarczyk E.
Polish Journal of Veterinary Sciences
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2016
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issue 1
3

Relation between Ava I polymorphism within the estrogen receptor gene (ESR) and meatiness in Polish Large White boars

100%
Kaminski S., Rusc A., Brym P.
Journal of Applied Genetics
|
2003
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vol. 44
|
issue 4
521-524
EN
It is currently debated whether identification of ESR (estrogen receptor) genotypes should be introduced into breeding programs of Large White pigs. The aim of this study was to evaluate the possible relations between ESR/Ava I polymorphism and carcass performance traits in Polish Large White boars. We examined 103 boars originating from one herd in NE Poland. ESR/Ava I genotypes were determined by the PCR-RFLP method. By the use of the Duncan test, we found highly significant differences (P < 0.01) between WW and MW genotypes, as well as significant differences (P < 0.05) between WW and MM genotypes for meatiness. No significant differences were found for daily gain and selection index.
4

Nucleotide sequence polymorphism within exon 4 of the bovine prolactin gene and its associations with milk performance traits

100%
Brym P., Kaminski S., Wojcik E.
Journal of Applied Genetics
|
2005
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vol. 46
|
issue 2
179-185
EN
Prolactin plays an important regulatory function in mammary gland development, milk secretion, and expression of milk protein genes. Hence the PRL gene is a potential quantitative trait locus and genetic marker of production traits in dairy cattle. We analysed the sequence of the PRL gene to investigate whether mutations in this sequence might be responsible for quantitative variations in milk yield and composition. Using SSCP and direct sequencing, we detected six single-nucleotide polymorphisms within a 294-bp prolactin gene fragment involving exon 4. All detected mutations were silent with respect to the amino acid sequence of the protein. PCR-RFLP genotyping of SNP 8398 R (RsaI) was used to assess allele frequencies in 186 Black-and-White cows (0.113 and 0.887 for A and G, respectively) and in 138 Jersey cows (0.706 and 0.294 for A and G, respectively). Black-and-White cows with genotype AG showed the highest milk yield, while cows with genotype GG showed the highest fat content.
5
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Total RNA quality in boar spermatozoa with different freezability

89%
Fraser L., Brym P., Mogielnicka-Brzozowska M., Wasilewska K., Fraser L., Brym P., Mogielnicka-Brzozowska M., Wasilewska K.
Polish Journal of Veterinary Sciences
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2019
|
issue 1
6
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Association of polymorphism within LTF gene promoter with lactoferrin concentration in milk of Holstein cows

88%
Kamiński S., Zabolewicz T., Barcewicz M., Brym P., Puckowska P.
Polish Journal of Veterinary Sciences
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2014
|
issue 4
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