Show an anti C hog ho 7 V irv cholera serum improving lal aj 9 blood cells are removed and clear liquid left fo for rUse use by the united states 0 f Agriculture 1 constant improvement in the process of preparing antl hog cholera serum has resulted lu in a hilgh alah standard of quality for this biological product in the united states among important developments of recent years yeara are the clarification of seram concentration or of the serum into smaller vo volume linne and more recently an improved method of pasteurization in which nil all containers are completely submerged in it water bath and the serum is agit agitates atea while being heated A description io it of present methods of serum production product lou as conducted under federal licenses appears in a scientific paper presented recently by dr 0 1 L skidmore at a n conference of farm bureau members veterinarians and live stock sanitary officials doctor skidmore is tile the oh caal of the united states department of agriculture in charge of the administration of the federal virus serum serum toxin law which seeks to insure a 0 high quality of veterinary biological products result of clarification the process of clarification doctor skidmore stated state removes the blood cells which have no protective pi elective value and leaves a clear liquid which when preserved and tested becomes the product used in immunizing hugs hogs against cho cholera leca the veterinarian finds it easier to handle the concentrated clear product an and that the clear serum Is less likely to clog the syringe the serum on the market he explained has about 80 per cent of tile the volume of the un concentrated serum prepared from the same amount of blood this means that four bottles of the clear serum will immunize as many pl pigs s as five bottles of the un concentrated product tile the coit co t of bottling packing and shipping a given number ol of doses Is consequently 20 per cent less than for the more bulky product the most important advantage of the clear serum la Is that pasteurization destroys any disease producing bacteria teria doctor skidmore declared at the same time this process by destroying other bacteria improves the k keeping quality pasteurization also erin enables bles the he manu fac to prepare an adequate reserve supply of serum without fear that tits supply may be of questionable purity because of outbreaks of live ive stock dis ata eases in the territory from which tho ali serum animals were procured this Is a protection to the live stock raisers misers generally as well as to tile the manufacturer results satisfactory antl anti hog cholera serum Is prepared in large quantities and Is used by many individuals under varying conditions cut but there Is no other oilier biological product doctor skidmore stated which Is used with such uniformly satisfactory results in a few cases reported as unsatisfactory the actual enuse cause usually was traceable to un der dosing the animals with serum scrum or to some other fator factor rather than to anny lack of serum potency in ID the last calendar year manufacturers produced enough serum to immunize e more than lt laux UX hogs bogs or more than 29 per cent cat of tile the estimated pig crop |