People supplement their regular feeds with treats all the time. Some people even mix their own feed. Nowhere is it written that one must be so rigid with their feeding as to stick only with Blue Seal Extra Layer. Personally I think some variety is good. Now, with regard to my original post, really and truly, I was just thinking (out loud) of all the leftover "broths" that get chucked out and wondering if it wouldn't make sense to occasionally add these things to the regular feed, to give it some added interest from time to time. Nothing more than that. I realize the temptation to supplement regular feed with treats (other than the regular solid scraps I give them every two days) is not necessarily one that should be given into at every turn. Nor obviously are all leftovers good for the hens.
As for canola, I prefer to agree to disagree about it's properties but I thank you for the warning and it's got me thinking about whether feeding it after cooking with it is worth the risks. I have to admit, it's probably not-and I'll probably just dispose of it elsewhere.