I'm not going to argue against adding light in the winter. We all have different goals and need to reach them in different ways. What I will argue for is that the laying hens eventually need some down time unless you just keep them for a year and a half or so of laying and then get rid of them.
Eggs get bigger after a molt, so there can be some benefits to having them molt.
After a length of time of solid laying, the egg shells get lighter if you have brown egg layers. That by itself is not a huge problem, but it may be a sign that the egg quality can drop. Also the number of eggs they lay will start to taper off. My pullets that start laying in the fall usually continue to lay throughout the winter and all the next season until they go into a molt. I don't provide any extra light. Before that molt, I sometimes notice a slight drop in egg numbers and the eggs just don't look as nice. I can't say I've seen a huge increase of problems with the eggs, no additional blood spots or meat spots, no weird sized or shaped eggs, nothing like that. The drop in number is not that noticeable to me either, but I don't have three to five houses with 5,000 laying hens in each. With those numbers, it might get real noticeable.
The commercial operations keep their hens on artificial lighting to control when they lay and when they molt. The commercial operations do not keep hens laying indefinitely, but eventually either allow them to molt or replace them. If egg production, either in quality or numbers, did not drop enough for it to be an economic issue, the commercial operations would just keep them laying indefinitely instead of paying for feed for nonproductive molting hens or nonproductive chicks growing to become layers.
Eggs get bigger after a molt, so there can be some benefits to having them molt.
After a length of time of solid laying, the egg shells get lighter if you have brown egg layers. That by itself is not a huge problem, but it may be a sign that the egg quality can drop. Also the number of eggs they lay will start to taper off. My pullets that start laying in the fall usually continue to lay throughout the winter and all the next season until they go into a molt. I don't provide any extra light. Before that molt, I sometimes notice a slight drop in egg numbers and the eggs just don't look as nice. I can't say I've seen a huge increase of problems with the eggs, no additional blood spots or meat spots, no weird sized or shaped eggs, nothing like that. The drop in number is not that noticeable to me either, but I don't have three to five houses with 5,000 laying hens in each. With those numbers, it might get real noticeable.
The commercial operations keep their hens on artificial lighting to control when they lay and when they molt. The commercial operations do not keep hens laying indefinitely, but eventually either allow them to molt or replace them. If egg production, either in quality or numbers, did not drop enough for it to be an economic issue, the commercial operations would just keep them laying indefinitely instead of paying for feed for nonproductive molting hens or nonproductive chicks growing to become layers.
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