It all depends on what part of the country you are in too.
As a dairy farmer myself, we don't use any sort of hormones on our animals. they are all raised and grown naturally.
They are only given antibiotics if it is life-threatening. And when they are treated with antibiotics, we throw away the milk for an extended period of time. It is thrown out until it has been tested as safe and free of the antibiotics used.
And when it comes to treating a cow raised for beef, they are not slaughtered for a certain number of days after the last treatment. The meat too has to be tested before it is sold.
People watch those videos, but they don't realize that there are 2 sides to every story. The are STRICT regulations in the US when it comes to producing food, especially in the beef and dairy industries.
My advice is don't become a vegetarian just because of what you read and see. Go visit your local farms and farmers markets and ask them questions. Find people who raise meat, dairy products, and produce and see just how everything is grown, raised and made. Then if you decide to buy from them, not only are you buying food that you know was grown safely, but you are also helping to support your local community.