How many litters per sow

[eskinner45]

I was just curios as to how many litters most of you guys let your sows have before you cull them out?

[Windfall Farm]

I normally keep a sow for 4 years before we cull her at our barn , so I guess 5 to 6 litters would be accurate, there are exceptions a really good sow can go a little longer but we normally know it's time to get rid of her by two things noticing her heat cycles aren't as on schedule as they were when she was younger or if she's getting so big and old that she starts having feet issues (her declaws on her back feet are almost touching the ground)