I have a cow (Black Angus) that has had 6 calves in her life. I've had her for 7 years. She is 9 years old. I was wondering about how many years can a cow keep calving before problems arise? She is due to calve in the next couple of weeks and I've noticed she is slowing down quite a bit. Walks a lot slower, almost like she's in pain. (but I don't believe she is) Has a harder time getting up from a laying down position, has to rock back and forth a few times before she gets her ooomph to get up. These are all signs I've never seen with her in the past. Is she getting too old? I hate to cull her because she's a GREAT calver and a great mama. But then again, I don't want her to have problems due to her age. Is this normal behavior for an aging cow?