You are right that some of the stuff I suggested is already in the game in some form - found out for myself after messing around a bit more - however I think you might have misunderstood something as you English looks a bit off (machine translation error would be my guess) ...
Breeder pill is a temporary effect as far as I can tell, While what I'm suggesting is a way to be able to cause / become pregnant with a 100% chance 100% of the time as both a starting toggle and maybe caused by an effect.
Likewise, while the effect can be applied at the hospital, The lactation suggestion is a could work as a stating toggle for anybody who wants to make a cow-like character always producing milk if they are able to from the beginning .... maybe the nurse / doctor met at the start would notice and mention the option to sell it if you don't try to fight her as a bit of extra flavor text ?