Show vaccination tests at experiment stations vaccination tests at ames kansas and kotlier experiment stations andl indicate that pigs even a few days old can be immunized against cholera chol fera in a high percentage of cases and with pigs approaching weaning seven to nine weeks old immunity is as certain as as with old hogs the explanation offered by careful abse observers vers of this apparent appi rent variation 0 pe between tween ex experiments per inen ts and practice generally hilgeson hin hinges geson on this fact pigs up to six or eight weeks of age have tender pliable skin and soft flesh with ordinary vaccinating practice where rapid handling and treatment Is commonly the rule it Is probable that among certain individual pigs there Is more or less leakage of serum from the hole through which it was injected if this Is true it does offer a reasonable and plausible explanation why vaccination Is uncertain with young pigs this fault or error should not apply to pigs eight weeks old or older especially when the job ls Is carefully done with speed not the dominating thought while the job Is being done it appears to be sound mounil policy to vaccinate pigs when the younger ones reach two months of age |