I googled for a few minutes, and found this likely unrelated blurb, but I thought it was interesting... "domesticated animals are more likely to: be smaller or

I googled for a few minutes, and found this likely unrelated blurb, but I thought it was interesting... "domesticated animals are more likely to: be smaller or larger than their wild counterparts; undergo multiple periods of fertility within the span of one year (a trait referred to as being polyestrous), unlike wild animals, which often mate seasonally" [1] If you're only mating annually, I'd guess natural for higher sperm count would be more of a factor. If you're a perpetual, opportustic mater, I'd think it be more about selecting for the number of times you could mate. [1] http://sitn.hms.harvard.edu/flash/2018/asked-pets-different-wild-animals/ http://sitn.hms.harvard.edu/flash/2018/asked-pets-different-...