>>12484012
If you watch and understand the jockey markings and subtle things like ear covers the show is very clear about the gender of the original horses including one intersex true hermaphrodite. That said the majority of the racers and thus the girls in Uma Musume would otherwise be male if you ascribed gender 1:1 with the real world. If that were the case it would be a Shonen manga and anime instead of a Harem type. Since it's a harem type (and the "why" is to appeal to gooners and romantic fantasy/wish fulfilment, to wit: the trainer gets to fuck all the horsegirls they want) it makes sense to just go ahead and change all the horsegirls to female, with true breedable female anatomy instead of having any horsegirls be boys which would instantly change the question to "so why wouldn't uma musume want that boyhorse cock" and change the whole paradigm to NTR and NTR and your personal fantasies about being cucked by boyhorsedick DON'T SELL GATCHA. Harem wish fulfilment does, ergo they are all girls.
>>12484234
>>12484237
for the record there are no actual horses in uma musume, again it's harem gooner bait not NTR cuck shed shit
