This study investigated the effect of stearoyl-CoA desaturase (SCD) gene polymorphism on milk production traits in 277 Hungarian Holstein Friesian cows. The researchers found a higher frequency of the C allele (0.61) and lower frequency of the T allele (0.39). Analysis of variance showed no significant association between SCD genotypes and milk yield or composition traits. The results suggest SCD-878 C/T locus is not a strong candidate gene for milk production in this population.