After about 35-40 days of life, chicks are called pullets. After a few months, if the pullets are well fed and kept in suitable and clean shelters, they become chickens and develop an abundant, colourful plumage and tasty meat without fatty deposits. As their weight increases, the nutritional requirements of growing chickens change; in particular, the protein amount they require decreases while the energy amount they need increases. It is therefore important that chickens eat a food that is specific for this second phase. The usage of a complete food meal facilitates high levels of feeding in pullets and chickens; its ingredients, ground to different particle sizes, stimulate the animal to feed constantly throughout the day, facilitating the harmonious and constant growth of all organs and systems, in particular its bones and muscles.