2050 - world population will require: 100% more food and, 70% of this food should come from efficiency-improving technology. Increasing human population results to reduction of areas of agricultural production which results to the increase of challenge to produce animal food products.
The joint evolution of man and animals resulted to domestication of animals for food,power,transportation, religion,recreation,war, companionship, etc.
animal is for meat production only. Prevention pregnancies or Prevention of undesirable traits/health conditions. castrated before slaughter to improve meat quality.