Back when I was managing our dairy, we would run every cow into the stall to check/trim her feet at dry up... and we got pretty good at it. Reason for this protocol was first because they were on concrete alot, which tends to cause their feet to grow long, and second, if they did have a foot problem during lactation, it'd really hurt their production. Third, if we did end up trimming a little too close and made 'em bleed, it wouldn't affect their milk production at that point, and by the time they calved they'd be all healed up again. We knew the animals in our herd, and their feet issues. Had one cow that just had terrible feet, walked way down on her dewclaws, and grew long toes because of her feet/leg conformation, had to trim her a couple times a year... Well, she had twin heifer calves... So we took a good look at those calves right from birth and sure enough, they were already bad right from the get go.
If they start life out that way, then their bones won't be able to grow right, and you'll never have a "good legged animal". So we started trimming those two calves from about 4 months old, and about every 3 months from that point to fully grown and calved, to straighten them up and get 'em walking right, and to get their bones grown right. It worked... we got 'em straightened up, and they really didn't have any foot problems as "adults"............ but guess what their calves feet looked like, even though we were selecting for really good feet and leg bulls on them............... You guessed it... they also needed to be straightened up as calves..................
We thought we were being really good herd managers... BUT.... what would have been the best way to correct their bad feet, and our "work issues" in the herd for this "problem"?... As gcreekrch said, "Kill plants do the best job of trimming feet. Bull breeders who perpetuate the problem should be exposed for the number chasing wreckers they are."