Review of evidence for adaptation to sperm competition in three major domesticates from Sperm competition as an under-appreciated factor in domestication

Here we provide a brief review of evidence for sperm competition in dogs, cats and pigs. The evidence indicates that there are different levels of promiscuity between these domesticates and their wild counterparts. We further go on to illustrate that there is significant evidence that this promiscuity and changes in mating behaviour has resulted in adaptations that are likely associated with selective pressures for sperm competition in the domestic animals, but not in their wild counterparts.