Crossbreeding effects on some semen and litter traits in rabbits. M.Sc .Faculty of Agriculture, Benha University. Crossbreeding effects on some semen and litter traits in rabbits CROSSBREEDING EFFECTS AND POLYMORPHIC ASSOCIATIONS OF GENOTYPES OF GH GENE WITH GROWTH TRAITS IN RABBITS ASSOCIATION OF GH GENE POLYMORPHISM WITH GROWTH AND SEMEN TRAITS IN RABBITS