The egg industry is a highly developed and technical industry. To achieve success, the producer must be something of a scientist, a nutritionist, an engineer and a businessman. On a modern poultry farm, eggs are gathered daily. They are then graded according to quality and weight. The quality of the eggs is determined by means of the candling method without having to break the shell. Each egg rotates under a harsh light. The quality of the egg yolk the white and the air space are monitored and eggs that don't conform to requirements are thrown out.