Horn flies, face flies, and stable flies are not just irritants to livestock, but are economically important to producers due to negative impacts on milk production and calf weaning weights.
Many producers will castrate their calves when they are two or three days old, which is my preferred period. Castration should occur when the calf is rather young.
When animals have health or performance problems it is almost always because the person in charge of taking care of them is not showing the proper interest in what they need.