How are fertile eggs treated in a hatchery?

In a hatchery, fertile eggs are placed in incubators with monitored conditions to ensure optimal development and hatching of the embryos inside. This process involves carefully regulating temperature, humidity, and ventilation within the incubators to create the ideal environment for the eggs. The specific conditions help mimic the natural conditions that a hen would provide if she were incubating the eggs.

Maintaining these controlled conditions is crucial for the embryos to develop properly and to ensure a high hatch rate. Incubators often come equipped with systems to rotate the eggs, which is an important aspect of artificial incubation to prevent the embryos from sticking to the shell and to promote even development.

The other options do not reflect appropriate practices in a hatchery. Directly placing eggs in cages would not provide the necessary environmental controls needed for hatching. Cooking eggs before hatching is not only ineffective but also detrimental to the development of the embryo. Transforming eggs into feed is not a standard practice in hatcheries, as the goal is to hatch the eggs into chicks or other birds rather than use them for feed. Hence, placing fertile eggs in incubators under monitored conditions is the correct and standard practice in hatcheries.