A broiler is any chicken that is bred and raised specifically for meat production. Also the broiler industry is the process by which broiler chickens are reared and prepared for meat consumption. Broiler flock that weight more than other types of poultry, maintenance energy is a major part of their energy needs.

In laying hens, egg production is affected by the amount of energy in the diet. Due to high appetite of these chickens, so it is necessary limit their daily intake physically; and suitable management should be applied for rations in terms of ration formulation and nutrition management.

Also you should know the needs of birds contain 7 major nutrients are provided by the ingredients that make up the diet. Ingredients are classified as: cereal grains, animal proteins, vegetables proteins, animal fats, microminerals and vitamin premixes. Also you should know birds are very sensitive to the change in their environments.

Changing the ambient temperature to 12˚c has great effect on egg production. Unfortunately, mother hens spend all their extra energy on ovulation and fat storage. These two may interact with each other and altering hormonal control of ovulation.

When it is necessary to increase the energy of the diet, it is also necessary to control the energy consumption by creating a physical restriction on the consumption the diets. Daily energy that required for mother broiler flock about 100 k.cal of metabolizable energy per kilogram of weight of poultry in this flock. So for a broiler with weight of 3.2 kg, which is at the peak of production, should give them 450 k.cal of energy per day.

There is a little information about the energy needs of roosters in flocks. Since in the most cases the roosters are fed separately, so it is possible to use special diets to meet their needs maintenance and growth. Roosters are more affected by ambient temperature; because 95% of their energy are spent on maintenance.