24 seven-week-old hybrid healthy pigs (weighted 25.5?.4 kg ) from a source were randomly allotted to four groups (six each): the blank group, the negative group
A total of 40 rats, aged in 30 days, were divided into 4 groups and immunized (intramuscularlyinjection) with 0 μg(control), 15 μg (group 1), 25 μg (group 2)