A characteristic of sperm cell membranes is that as ambient temperature rises, the mobility of the lipids in the bilayer plane increases and fatty acid chains become shorter and less saturated . This lateral diffusion of lipids bestows upon the bilayer the fluidity of a liquid. Membrane proteins also show lateral diffusion, though at a slower rate than that of lipids. However, at preservation temperature of 15ºC there is virtually no diffusion. Membrane lipids become solidified at this 'low' temperature and their movement is prevented as well as the movement of membrane proteins, maintaining the structure of the cell membrane and the structure of the cell membrane is maintained.
A further process with negative results on semen viability is caused by dead sperm cells liberating metabolites and enzymes into the medium. These are neutralised by all our extenders. Toxicity of dead sperm cells is related to the oxidation of amino acids. The presence of aromatic amino acids leads to the formation of the enzyme peroxidase which is part of the necessary oxidatory machinery.
Factors influencing the preservation capacity of boar sperm cells have been exhaustively studied with the aim of obtaining the maximum guarantee in cell structures preservation and an optimum performance at fertilization. All our extenders are boar sperm preservation media that fulfil all requirements regarding modern-day artificial insemination of pigs, and guarantees the initial quality of sperm for 7 - 8 days under adequate storage conditions.