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Advisor(s)
Abstract(s)
This research sought to determine the effect of selected milk protein polymorphisms on the
reproduction parameters of 598 black and white Polish Holstein–Friesian cattle. The analyzed genes
were kappa-casein (CSN3) and beta-lactoglobulin (BLG). The following reproductive indexes were
selected: the age at first calving, the interpregnancy period, the calving interval, and the insemination
index. The influence of the identified genotypes on the course of parturition in cows was also analyzed.
Source data were collected for each cow from the beginning of the herd life and reproduction to its
culling from the herd or the end of its third lactation. Data on the age at first calving, the amount of
semen portions for artificial insemination (insemination index), the interpregnancy period, and the
calving interval for each cow were also collected. A contingency analysis was performed through
contingency tables using a Pearson’s chi-squared test for each CSN3 and BLG genotype. The results
show that the BB genotype of the kappa-casein gene was associated with the most favorable values
of reproductive indicators. In the case of the calving interval, the values were significantly more
favorable than those of other genotypes (p 0.05). No effect of beta-lactoglobulin polymorphism on
the analyzed reproductive indices was observed. On the other hand, in the case of the interpregnancy
period, significant statistical differences were obtained between the AA and BB genotypes. The
analyzed kappa-casein and beta-lactoglobulin genotypes did not significantly influence the course of
parturition in cows. To conclude, the genotype polymorphism BB CSN3 is the most favorable for the
performance of the cows in the examined herd.
Description
Keywords
Polish Holstein–Friesian cattle Milk protein polymorphism Kappa-casein Beta-lactoglobulin Reproductive indicators
Citation
Czerniawska-Piątkowska, Ewa; Cioch-Szklarz, Barbara; Kowalczyk, Alicja; Wrzecińska, Marcjanna; Wójcik, Jerzy; Kordan, Władysław; Araújo, José Pedro; Cerqueira, Joaquim; Kossakowski, Kamil; Cwynar, Przemysław; Sablik, Piotr (2023). Relationship between milk protein polymorphism and selected cows’ reproductive indices. Animals. eISSN 2076-2615. 13:11, p. 1-10
Publisher
MDPI