Heterosis
From BIF Guidelines Wiki
Heterosis (hybrid vigor) Amount by which the average performance for a trait in crossbred calves exceeds the average performance of the two or more purebreds that were mated in that particular cross.
Heterosis (hybrid vigor) Amount by which the average performance for a trait in crossbred calves exceeds the average performance of the two or more purebreds that were mated in that particular cross.