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Yes, some breeds do seem to be more sensitive than others. Or else it's individual hens rather than entire breeds. When I have noticed it, I had a few each of multiple breeds, so it wasn't obvious whether it was an actual breed difference or an individual hen difference.

Protein is made of amino acids. Lysine and methionine are amino acids. When we talk about them individually, we call them amino acids, not proteins. Amino acids can be combined in different ways to make many different proteins. For example, casein is one particular protein in milk (not the...

No, because I don't have any not-laying chickens to test with at this time. But I have raised chickens at various points over the last several decades, and I have seen lots of cases where they aren't laying and then they all start up in quick succession. And I have seen cases where they all...

If they started laying about a month after you provided the extra light, that is about what I would expect if the light made the difference. It takes several weeks for a hen's body to go from not-laying to laying. She grows a whole bunch of egg yolks from pinhead-size up to ready-to-lay yolk...