An analysis of CYP19, CYP21 and ER genotypes in Polish Holstein-Friesian cows with regard to the selected reproductive traits
2011
Szatkowska, I.,West Pomeranian Univ. of Technology, Szczecin (Poland). Lab. of Molecular Cytogenetics | Grzesiak, W.,West Pomeranian Univ. of Technology, Szczecin (Poland). Lab. of Biostatistics | Jedrzejczak, M.,West Pomeranian Univ. of Technology, Szczecin (Poland). Lab. of Molecular Cytogenetics | Dybus, A.,West Pomeranian Univ. of Technology, Szczecin (Poland). Lab. of Molecular Cytogenetics | Zaborski, D.,West Pomeranian Univ. of Technology, Szczecin (Poland). Lab. of Biostatistics | Jankowiak, D.,West Pomeranian Univ. of Technology, Szczecin (Poland). Lab. of Physiological Chemistry
The aim of this study was to relate polymorphic variants of CYP19, CYP21 and ER1 genes to reproductive traits in 472 Polish Holstein-Friesian cows. High frequencies of one of the homozygous genotypes were found. The ER1/SnaBIAA homozygotes were not identified. In the first and third lactation, the average calving-to-conception interval (CLVC) was significantly shorter in cows of ER1/SnaBIGG genotype than in heterozygous cows. In the cows of ER1/BglIGG genotype, significantly shorter CLVC was observed in comparison with heterozygotes in the first lactation, whereas in the third lactation, CLVC was significantly longer in homozygous than in heterozygous ones. Homozygous cows were characterized by significantly longer calving interval in comparison with heterozygotes in the third lactation. Longer CLVCs were found in CYP19AA cows in comparison with heterozygotes. This difference was significant in the first and third lactations. Similarly, the average CLVIs were longer in CYP19AA homozygotes than in heterozygous cows; however, the difference was significant only in the third lactation. Description of the molecular mechanisms regulating reproduction may facilitate the employment of selected reproductive models.
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