Just want to thank everyone for past advice. I'm wondering if I'm heading in the right direction. I'm trying to build a commercial herd on my farm and have been buying bred cows,and some cow/calf pairs.I know economically it would be unwise to buy heifer calves, and wait for them to either mature, or wait for them to have calves,my question is buying pairs at sales.Why do people sell a good cow that's bred or a cow with a young calf at side? Why not wait for her to raise that calf to say 4-500 lbs, and then just take the calf to the sale? Is there something I am not seeing that I should be aware of?