The process of examining an egg with a bright light source to assess its interior contents is a common practice in poultry management. This technique allows for the determination of fertility and the monitoring of embryonic development without breaking the shell. Light is shone through the egg, revealing details about the yolk, air cell, and any developing embryo.
Understanding internal egg characteristics via light transmission offers several advantages. It enables producers to remove infertile eggs early in the incubation process, optimizing incubator space and energy usage. Historically, this method was crucial for maximizing hatching rates in a time before advanced imaging technologies were available. Now, it continues to be a valuable skill for small-scale farmers and hobbyist poultry keepers due to its simplicity and low cost.