Shil Jin

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First-parity data were collected from 11,348 Hanwoo cows from nine commercial herds in the South Korean province of Gyeongsanbuk-do. Four female reproductive traits, namely AFC, CI, GL, and NAIPC, were examined. The AFC, CI, and GL measurements were recorded in days, whereas NAIPC was recorded as the total number of occurrences. A total of 11,348 Hanwoo cows were genotyped using an Illumina Bovine 50 K SNP chip (Illumina Inc., San Diego, CA, USA), where 53,866 SNPs were embedded.

Abstract Conducting genome-wide association studies (GWAS) for reproductive traits in Hanwoo cattle, including age at first calving (AFC), calving interval (CI), gestation length (GL), and number of artificial inseminations per conception (NAIPC), is of paramount significance. These analyses provided a thorough exploration of the genetic basis of these traits, facilitating the identification of key markers for targeted trait improvement.