Shaving/clipping cows

It's summer time now and we are taking cows to pasture next week. We noticed that a few of our cows have a lot more hair that they didn't shuck. What blade/clipper combo do you use? We have our regular head clippers as well as an older "sheep" head.

Also I've seen a few photos going around with younger calves having a decent amount of their hair clipped of before heading to pasture. (Not clipping for pictures) is there a big benefit to this vs shucking after weaning?

Any tips and pointers would be great!
Thanks in advance.

Useing the head clippers is fine, on the sheep heads I use a beveled blade that just cuts through hair like butter. This blade has dull tips so it's safe on calm cattle. I clip down the top to half way down the side , neck, head, and tail.  I do this in July when I have them all coming in for shots and deworming. If I see hoof issues I treat them as well. Do pregnant checks and pull blood if needed. January and July like clockwork