1 Laboratory animal practice-Some veterinarians work in a university or industrial laboratory and are responsible for the care and treatment of laboratory animals of any species (often involving bovines, porcine species, felines, canines, rodents, and even exotic animals).
High estrogen levels in men contribute to prostate cancer and heart disease as well as gynecomastia (enlarged breasts).As the testosterone is transformed into estrogen the low levels of testosterone can cause many unpleasant symptoms including loss of muscle mass, fatigue, low libido, erectile dysfunction.s teenagers, men have high levels of testosterone and low levels of estrogen. As they age, testosterone levels in men decrease while their estrogen levels increase.
Hormonal Conditions. All hormone-containing drugs and drugs prescribed for hormone-related, reproductive, male-specific, and female-specific conditions and situations have the potential to cause hair loss, including: 1  Birth Control Pills. 2  Hormone-replacement therapy (HRT) for women (estrogen or progesterone).