Disclosed is a heterogeneous inseminate, comprising: a) a first amount of sperm of a first animal； and b) a second amount of sperm of a second animal combined with the first amount of sperm of the first animal, the first animal and the second animal of the same species, wherein only one of the first amount of sperm or the second amount of sperm comprises sex selected sperm resulting from a sex selection process which separates sperm based on bearing an X- chromosome or a Y-chromosome.
