Approximately 68.790.000.000 slaughtered worldwide per year
Source/2018 https://ourworldindata.org/grapher/animals-slaughtered-for-meat
Chickens are subjected to more torturous conditions than most, if not all other farmed animals. They are stacked in tiny wire cages, or placed under large tents by the thousands, a condition usually mislabeled as “free – range”. Their entire lives are spent in a miserable, unhealthy setting, where they have no access to the outdoors and most never get to see the light of day. Many of these animals spend years unable to move.
As a result of this, chickens often develop a very aggressive behavior toward one – another, causing serious injuries. To avoid this outcome, most farmers de-beak their chickens, without the use of anesthetic.
These unlucky birds spend their short lives trapped and unable to stretch their wings, or forage for food. Their cages are so small that they cause wounds that never heal, while their feet often merge with the wires, a process that causes them excruciating pain. The animals barely cling to life, surrounded by their own feces and urine and unable to engage in any of their natural behaviors.
Those who are lucky, or unlucky enough to survive, are sent to the slaughterhouse, where they are hung upside down and killed (sometimes ineffectively), while fully conscious.
The fate of egg – laying hens is no different. They too spend their lives in cages so tight that they are unable to turn around, and are soon killed because their spent bodies are unable to keep up with production standards. As for male chicks who are useless to the industry, they ground up alive only a few hours after hatching and usually turned into minced meat, or used to make pet food.