This trace element plays a key role in a lot of enzyme systems. It can also play a role in immune function and keratin production and hoof health. While most animals have high tolerance for zinc in their diet.
Pastures typically have adequate levels of zinc; however, hay and straw are said to have lower concentrations.
Deficiency can be seen in young growing calves. You can see issues with skin (alopecia) and poorer skin health. some authors have suggested it may play a role also in hoof health.
Zinc also plays a role in sperm health in bulls and rams.
We can measure blood levels but this may be rarely done. Often farms will supplement with zinc at 50mg/kg