Negative serum antibody against Hog Cholera in sows, growing pigs and piglets were 8.89%( /), . % (/ 7)and . ( /09)respectively.

母猪、育肥猪、仔猪血清中猪瘟抗体为零的百分比和份数分别为7 . %( /)、. % (/ 7) 、 .0 % ( /09) ,免疫效果最差的是仔猪。