E502 To-Mar Blackstar: The One-Embryo Holstein Sire Behind 15.8% of Today’s DNA – and the Genetic Debt in Your Herd
E502 discusses To-Mar Blackstar, a Holstein sire whose genetic influence is present in 15.8% of the current breed. The episode details his origins, rise to prominence, and the genetic consequences for the Holstein population, including increased inbreeding.