Anabolic steroids increase the production of red blood cells, which increases the amount of circulating oxygen and promotes tissue growth. Testosterone, made by the testes, is a naturally-occurring anabolic steroid. Synthetic anabolic steroids are similar to testosterone, but they don’t have as many masculinizing effects. Anabolic steroids are used to treat chronic, non-regenerative anemia in pets. They also are used to increase muscle mass, improve body weight and condition in older dogs and restore weight and body condition in animals after surgery or debilitating disease.
Cholesterol - Cholesterol is a major precursor of cholesterol ester, bile acids, and steroid hormones and is a component of plasma membranes. It is a necessary component of all cell membranes. It is the precursor to all steroid hormone (including estrogen , testosterone , cortisol , and vitamin D ). It is the leading organic molecule in the brain and is needed for brain function. However, too much cholesterol in the bloodstream can be unhealthy, it builds up in the artery wall and can lead to the signs and symptoms of coronary heart disease.
As castration has received criticism in recent years, due to welfare reasons, some producers and producer associations are seeking alternative methods to control boar taint.  Some producers are breeding out the taint and avoiding the few breeds of pigs that are high in taint. Yorkshire, Hampshire and other lighter colored pigs are known to be particularly low in the androstenone based taint while Duroc pigs are high in the taint. [ citation needed ] When pigs are raised on pasture in a rotational grazing system, similar to cattle, goats and sheep, the skatole based taint does not occur because the pigs are on fresh ground and not inhaling and eating their own feces.  , unfortunately this pasture grazing practice is not conducive to commercial pig production.