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Monitoring Report of Maternal Antibody of Broiler Avian Influenza Virus H5 Subtype Re-8 Strain

Animal Husbandry and Feed Science 2017年第6期9卷 411-412页

作者： Lv Yanqiu Animal Disease Control Center of Changping District

[ Objective ] The paper was to prevent the occurrence of broiler avian influenza virus HS subtype Re-8 strain effectively in the breeding process of broilers. [Method] The maternal antibodies of broilers in Beijing Baochen Hongwang farm were monitored. According to the disappearance law of maternal antibody, the optimal immune time of broiler avian influenza virus H5 subtype Re-8 strain was determined. [ Result] The maternal antibody level of 2-day-old broilers was relatively high, concentrated at 6 log2 -9 log2, and the antibody positive rate was 100%. The maternal antibody level of 8-day-old broilers concentrated at 4 log2 -6 log2, and the antibody positive rate was 100%. The maternal antibody level of 17-day-old broilers concentrated at 0 log2 -3 log2 , and the antibody positive rate was 0. The average maternal antibody level of 24 - 37 days old broilers was 〈 1 log2, and the antibody positive rate was 0. [ Conclusion ] Although the av- erage maternal antibody level of 8-day-old broilers was higher than 5 log2 , 20% of chickens was 4 log2, and maternal antibody could not protect the flock completely. Therefore, the best primary immunization day age of chicks against avian influenza virus was 8 - 10 days of age.

关键词： Maternal antibody Avian influenza virus H5 subtype Re-8 strain hemagglutination-inhibition test Monitoring Antibody titer

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Effect of Se-enriched Lactobacillus on Antibody of NDV of Broilers

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Agricultural Biotechnology 2020年第5期9卷 83-85页

作者： Yaowei LIN Yanfei LIU Jiande YANG Shunyi QIN College of Animal Science and Veterinary Medicine Tianjin Agricultural UniversityTianjin 300384China

This study was conducted to investigate the effect of Se-enriched lactobacillus on antibody of Newcastle Disease Virus(NDV)of *** thousand day-old AA broiler chickens were selected from a chicken farm of Jinghai County,and the chickens were divided randomly into two groups,which respectively had five repeat groups with 100 chickens each,one named basal diet group,and the other named Se-enriched lactobacillus *** soybean meal diet was selected for basal diet group,while 2%se-enriched lactobacillus was added into corn soybean meal diet for the other *** method of feeding was free diet,drinking,and routine immunization program was *** test period was 42 *** chickens were selected randomly in each repeat for slaughtering and collecting serums on the 14th,28th and 42nd *** on the effect of Se-enriched lactobacillus in antibody titer of NDV of broilers were made by hemagglutination-inhibition *** results indicated that antibody titer of NDV was increased significantly by Se-enriched lactobacillus.

关键词： Se-enriched lactobacillus NDV hemagglutination-inhibition test Antibody titers

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