https://www.f1savannahkittens.com A F1 savannah should not be cross bred with a serval to create a 75% serval blood f1 savannah. The Savannah cat breed is a hybrid breed that is a cross between a domestic cat (Felis catus) and the serval (Leptailurus serval), a wild African cat species. The term "F1" refers to the first generation of offspring resulting from the cross between a serval and a domestic cat.However, the acronym "HP" in the context of Savannah cats does not have a standard meaning. It's possible that it may refer to a specific breeding program, cattery, or some other abbreviation related to Savannah cats that has emerged after my last update.