no Muzikblike, first you split them not breed them and second how would anyone start an farm then:
I want a pig farm, ho shit al my piglets despawned, now we go search for some new pigs then for the 6the time, then would getting an level 30 enchantment table a real struggle (English is not my native langue) (and sorry if this is a bit passive aggressive)
and I hate this problem of sulfur cubes a lot, because I love sulfur cubes (thank you mojang for sulfur cubes :) )
Sorry Muzikbike I read your tekst wrong, so The answer is yes but you cant breed sulfur'cubes you split them