I was taken on a tour of a 12,000 chicken egg farm a couple days ago. WOW There was 6 rows of cages 3 hundred feet long. 11,000 eggs per day. Everything was automatic and the gear was imported from Germany. One man show. A couple hours in the morning, a couple in the afternoon, was all that he needed to run the show. Chickens were raised to 5 months before they were placed in the laying cages. The layers we there for 1 year before they were replaced. The chickens were then gassed and replaced. The gassed birds are then used for "chicken by products" like dog/cat food etc. They used to gas them on site but regulations changed and now they do it at the processing site. Farmer told me the feed had flax added to make them an omega 3 egg. Also said what they put in the feed to control the colour of the yolks but i forgot what he used. The colour was to please the consumer only and nothing else. It smelt nicer in the barns then out side the barns. In the hot summer months water mist is sprayed to control temperatures after 32C. If the temps get to 35C the birds only have a couple hours before they would die. Very impressive and very weird all at the same time. Glad I seen it, glad I am not one of those chickens.