Yes they were developed from an original leghorn but the ones the factories use are developed strains for mass egg production in a short amount of time. 300 egg a cycle is not normal. You need improvements to get this. The strains used in egg farming do not adapt well even the ones that are never put in production. I have had them and they do not work out as a rule they are different is all. But they do lay well.
That is problem are they "happier"? how do you measure that? what standard do you use? production? happiness is not a desired result outside egg production. How do you create happiness for a chicken? how do you distuinguish happiness from normal behavior? I have been in and seen these large operations and the birds are aler, eating, clucking and doig all the telltale signs of a content bird so I just do not see the evidence of cruelty or mistreatment unless I compare them to my birds but then again someone keeping their birds in thier living room may think I do not go far enough. It is all relative beyond basic care, food, shelter and water. I do understand that they are limited to a finite amount of space but it does not effect the basics so I think anything beyond that is mere speculation and does not warrant any change. It will never end if they go down this path because happiness is undeterminable in its function.
Well I have kept quite a few production type leghorns and they have all been fine. Faster and more nervous than the duals but no more so than the Spanish and Empordanesas I have also kept. Not only that, by my production layers have layed tremendous quantities for up to age 5 years. My best layers by far and living in free range and light confinement in henhouse/run systems. In production at factories they are burned out and culled by age 2 or so. So based on that, my management produces a longer laying period at high rates for the same type of bird (production leghorn from multiple hatcheries). So how does that square with them being unable to "adapt" well? And also, I never mentioned happiness (except in reference to your position), but it is easy to tell when birds are in an ideal situation, they produce eggs and grow well, maintain body condition, get sick less often or not at all, live longer, engage in natural behaviors and do not cannibalize, pick, etc. All my production leghorns fit that description under my care. Can you say the same for those in large production facilities? Not in my opinion, and I come from a family that has worked in big egg farms.
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