Individual, maternal, and paternal heterosis are the three types of heterosis. According to Bourdon (2000), retained heterosis is the improvement in the performance of crossbred progeny over purebred parents. Individual heterosis refers to the advantage of the crossbred individual over the purebred average. A Limousin x Hereford calf, for example, may grow faster than a purebred Limousin and Hereford's calf. Maternal heterosis is defined as a cow's output exceeding the average of her parent breeds, such as in terms of maternal ability, reproduction, longevity, calf survivability, pounds of calf weaned, and younger age at puberty.Paternal heterosis is the improvement of the bull's productive and reproductive characteristics. Reduced puberty age, increased scrotal circumference, improved sperm concentration, increased pregnancy rate, and weaning rate when mated to cows are examples.