Bi-directional cattle traceability process comprising five basic stages: a first document traceability and sanitary certification chain stage, wherein the animals are identified by birth certificates, animal identification attached to the animal's ear and registered in a data centre. A second stage for transfer of animals to another establishment, wherein genetic material is extracted from the offspring not yet weaned, filed and registered and registered in the data centre. A third stage for slaughtering of animals, wherein the slaughtered animal's ear is cut off where the animal identification is attached and the animal identification is read on line, the half carcases have sealed strips applied to them, DNA samples are extracted from the animal, then deposited in the official genetic bank and on each cut a locket sampler is attached encrypting a genetic and biochemical sample. A fourth stage for transfer or exporting of cuts, wherein the barcode that originated the cut is identified and applied to each portion of this cut or piece into which it is divided and then the locket sampler is removed from each sliced or minced cut, to deposit it in the cold storage chamber. A fifth and last stage of traceability auditing, wherein three samples of the identified portion of a cut to de audited are taken and adulteration of the cut or non-adulteration is determined by comparing the genetic sample taken in the third stage with the encrypted genetic sample in the locket sampler that held the original cutting extracted in the fourth stage. Alternative traceability processes addressed to fishing and canning and a set of elements used in the different stages of the three processes are also disclosed.