The commercial egg industry kills approximately 7 billion male chicks annually worldwide because they cannot lay eggs, a welfare problem increasingly being solved by in-ovo sexing technology.
Day-old chick culling involves the killing of billions of conscious individuals annually by grinding (maceration) or CO2 exposure. While both are considered humane methods, the scale — 7 billion annually — makes this one of the most numerically significant welfare issues in animal agriculture. In-ovo sexing technology, which identifies male embryos before hatching, eliminates the need for live culling entirely. Widespread adoption is currently limited by cost and consumer willingness to pay the premium.