The F in F1 stands for filial... f1 means first filial...
Per Dictionary.com:
filial -
1. of, pertaining to, or befitting a son or daughter:
filial obedience.
2. noting or having the relation of a child to a parent.
3.
Genetics. pertaining to the sequence of generations following the parental generation, each generation being designated by an
F followed by a subscript number indicating its place in the sequence.
So we are using it in terms of #3...
So "F1" is an incomplete statement...
F1 from wild... is what we generally mean when we say F1...
If I bought an animal from you that you bred in your tanks... it would be F1 from you...
It's somewhere between amusing and annoying how often we borry then butcher terms and theories from science