Growth hormones are given to animals, such as cattle, in order to make them gain weight faster, thus producing meat products for consumers at a faster rate. Growth hormones also increase milk production in animals. While dairy and meat industries depend on the use of growth hormones for increased productivity and profit, these hormones may hold negative health repercussions for humans.

Today, there are six anabolic steroids given, in various combinations, to nearly all animals entering conventional beef feedlots.

* Three natural steroids (estradiol, testosterone, and progesterone), and 
* Three synthetic hormones (the estrogen compound zeranol, the androgen trenbolone acetate, and progestin melengestrol acetate)

Anabolic steroids are typically used in combinations. Measurable levels of all the above growth-promoting hormones are found at slaughter in the muscle, fat, liver, kidneys and other organ meats.

Questions and controversy over the impacts of these added hormones on human development and health have lingered for four decades. In 1988 the European Union banned the use of all hormone growth promoters. The ADIs on the books for years are based on traditional toxicity testing methods and do not reflect the capacity of these drugs, which are potent endocrine disruptors, to alter fetal and childhood development. According to Swan et al. (2007)

Endocrine system – Glands that produce and secrete hormones and chemical substances in the body that regulate the activity of cells or organs.

".the possible effects on human populations exposed to residues of anabolic sex hormones through meat consumption have never, to our knowledge, been studied. Theoretically, the fetus and the prepubertal child are particularly sensitive to exposure to sex steroids."

https://www.organicconsumers.org/scientific/growth-hormones-fed-beef-cattle-damage-human-health

Additional source:  http://www.livestrong.com/article/98816-effects-growth-hormones/