1 .Piglets can get fairly gcxd immunity and mainin it for abcut six months if they are vaccinated while their parental antitbody titer is under x8
2.If the piglet are vaccinated when their transfer antibody titer is higher than x16, they can not get a good immunity. And their fomerimmunity will decrease gradually.
3.After vaccination, if the piglets get the antibody titer higher than x8, they can withstand the clrallenge of the virulency Hog Cholera ALD strain.
4.From the results of this study, it is noted, a better immunity will be produced when we vaccinate the piglets 1 to 2 months after the six weeks age.