Biological media, particularly for preserving fresh or frozen semen and/or for embryo collection and transfer; filtering media for medical and/or veterinary use; liquid media for collecting, preserving, freezing or thawing of embryos or microorganisms of the animal kingdom; aqueous vehicles for micro-organisms of the animal kingdom to be kept alive outside their natural environment; media for washing, filtration and/or freezing of sperm, as well as for the collection of oocytes