It lowers the blood pressure of the animal which takes off the a lot of "warm weather stress." Allowing your calf to have more open skin pores which leads to hair growth.
In my opinion trimming your calves feet is just like cutting your fingernails, when your fingernails get to long...you cut them right? Same with cattle however it is critical to the soundness of the animal especially between about 900 lbs. to the time they show or finish out, to have the feet...
Purina Grand Fortifier has tasco as well i believe. Also there are other hair growth products now available as I saw in this months Livestock Plus. I can't recall what they were but I understand that they are all natural products.
He looks great are you having a hard time maintaining weight? For his frame he looks about 100 pounds give or take to being in his prime for show day. Curious to hear how he does and see him after he is finished.
Have you considered Dirty Harry or Dirty Harry 2? You could add some serious power, hair and structure out of a bull that will not be to hard on your first calver!