::::The point is that strains and breeds are not "social concepts", they are the result of selective breeding in plants and animals; very different from the human concept of "race".  Species even more so; no human intervention at all, but rather a function of biology.  A 1966 source isn't going to work here, and though  was, well, rather grumpy, you did ask if you were being "silly to suggest this," and the answer is yes, you are.