Here is a brief video on rbGH that is given to cows to increase milk production.    www.YourMilkOnDrugs.com       It is a genetically engineered growth hormone. There are alternatives to drinking milk polluted with this hormone and I know that Wal-Mart sells products that don't have this dangerous chemical in it.  Better yet, learn to drink milk made from nuts, rice or soy, all plant sources to replace  the revered cows milk.