Results (
Thai) 1:
[Copy]Copied!
DiscussionGeneral ลักษณะของลักษณะต่าง ๆ ที่ศึกษาระหว่างตัวควบคุมและบำบัดสัตว์มีขนาดแคร่คล้าย เฉลี่ย 10.2-10.5 กับขาดทุน 14-15% เปอร์เซ็นต์ของมัมมี่และทารกตายคลอดในตัวควบคุม paralleted ที่รายงานก่อนหน้านี้ ได้Recommendation of the vaccination programme is that sows or gilts should receive 2 doses in the initial immunization series.the first dose may be given 35 to 150 day prior to expected farrowing. The second dose should be given 2-3 weeks prior to expected farrowing. Adequate levels of meternal antibodies will be obtained in subsequent farrowing by the administration of a single 5 ml. booster vaccination 2-3 weeks prior to farrowing. To and colleagues reported that antibody titer in serum were highest in anticipated farrowing,while k99 and 987p were highest and k88 was lowest in colostrum. The present study administered first vaccination between 116-131 days and second vaccination 2-19 day prior to farrowing, this practice should render higher antibody titers. During the first 3 day of life, average morbidity rate of diarrhea in the pigs born to control animals in the present study was similar to those previously reported but higher than those reported recently by Chantaraprateep and colleages.mortality rate due to diarrhea was observed only in control group from day 3,to day 6 and at day 9. Although morbidity rate of diarrhea in control group seems to be higher than those in the treated group from day 7 to 9 but they were not significant difference. The present finding indicated that E.coli bacterin vaccination can protect neonatal pigs during critical stages early in life against fatal ETEC induced diarrhea.most such vaccination rely on passive lactogenic immunity of the neoneted sucking. Protection induced by ETEC specific pilus antigen depends on antibody which blocks adhesion of pilli to specific epithelial receptors. It could also be the result of agglutination, steric hindrance, altering bacterial surface charge or opsonization by antibodies against ETEC specific pilli. Kohler and Moon and Runnels also reported thet vaccinated sows provided good protection for their neonates for 2-3 day, but less protection beyond that.
Being translated, please wait..
