Reuben - Great read.
I like to read old east German puppy test and books the testing they do is intense and starts almost at birth. I have not spent time looking but I am sure you can find it on the internet.
I would even be open to some book swaps on books on genetics ect if anyone has any old stuff. I like reading and listening to my old Pitbull breeders on how to put a pedigree together In my opinion they put a performance animal together better than any others but also greyhound breeders have some awesome practices.
The metabolism theory I don’t believe to be true being that I use to swap dogs from Minnesota winters to Missouri often and never witnessed this. In fact I myself have put on a lot of Whats up or Whatever? gut since moving from Minnesota in the winter to Texas.... oh that is the tacos