Feeding of domestic animals exploited for commercial purposes, whether for production
of meat or other products such as eggs and milk, move a string related to the manufacture
of food and agents that provide a better use of the food producer. Production systems
have traditionally been intensive, with a diet based on a concentrated diet that meets
nutritional requirements of these animals, highly in order to obtain a high and efficient
production. But today there is what is called “growth promoters”, which are the non-
essential for the biological function of the animal, but who have a specific positive effect,
as is the improve animal growth and feed conversion efficiency. The latter means that a
certain amount of food, animal metabolism can get more energy and by the consequent
more meat, more milk or more eggs; and less fat, bowel movements, etc. From this we
can know too, that growth promoters have the function to adapt the metabolism to
produce a better conversion.
Among the techniques to alter or modify the metabolism, are:
Use of steroidal hormones.
Use of growth hormones.
Use of beta-agonists.
Use of immune response.
Use of transgenic animals