About how long do your breeders last before you need to retire them? Do you base it on time or do you just wait until you notice production is going down? I知 still on my originals but I知 thinking I知 probably going to have to start retiring them soon. I知 not too sure when I started breeding but I壇 guess somewhere between 8-10 months ago. My original females are still producing but they originally produced very large 15 plus litters and now it feels like I知 lucky to get 10 so I知 guessing I知 getting around that time to start replacing them.