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¡¡¡¡Abstract

¡¡¡¡The  817  broiler  is  a  small  meat  chicken  produced  by  the  parent  of  the  fast-large  whitefeather  broiler  and  the  product  generated. The  product  produced  is  produced  by  the  product,which  combines  the  production  performance  advantages  of  white  charry  and  the  productionperformance of the egg chicken. It has the fast growth rate and good meat. specialty. Since thebody  of  817-breed  is  mainly the  commodity  generation  eggs,  there  is  no  disease  purificationand strict immunity, 817 broilers have more egg-rolls of eggs, and the maternal antibodies ofthe disease, so that 817 broiler disease is getting more and more complex. There are many typesof  epidemic  diseases,  old  disease  is  not  flat,  new  diseases,  general,  clinical  symptoms  aregradually  non-typical,  and  immunosuppressive  disease  is  increasingly  serious,  these  newfeatures  give  817  broilers'  disease  prevention,  which  brings  great  challenges.  In  order  toobjectively  evaluate  the  quality  of  the  chicken  seedlings  of  the  city  of  817  broiler,  furtherunderstand the popularity of major infectious diseases in the 817 feeding process, in order toprovide scientific basis and prevention and control programs for disease prevention and control,specializing  in  the  epidemic  disease  of  the  city  817  broiler  Research  on  Study  andComprehensive Prevention and Control Technology.

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¡¡¡¡This study passed the pathogens, serological and pathological testing methods, for 2019-2020,  56  city  817-scale  chemical  chicken  field  avian  influenza,  new  city  disease,  infectiousanemia, chicken, blood disease, adenovirus disease, Salmonella disease and large intestine Theepidemic  and  immune  status  of  the  seven  major  infectious  diseases  of  bacillus  disease  wasinvestigated.  The  survey  shows  that  most  of  the  817  broiler  farms  in  Yucheng  have  betterprevention and control of the above virus disease, but the adenovirus and the poor virus have ahigh detection rate and are mostly vertically infected, at 1 day old, 7th The detection rates ofadenovirus  and  pilot  viruses  were  18.07%,  17.05%,  18.44%,  14.47%,  14.34%,  14.53%,respectively. The detection rate of adenovirus and poverty viruses of clinical pathogenesis andpilot viruses is as high as 55.56% and 48.72%, far above three different age stages of sampledetection  rate.  The  results  of  bacterial  disease  test  showed  that  the  Samples  collected  in  thethree  different  ages  and  the  first  three  different  age  stages  of  7  days  and  the  previous  threedifferent  ages  were  the  highest,  14.46%,  18.95%  and  20.11%,  and  the  separation  rate  of Salmonella was relatively low. It is 6.02%, 5.04%, 8.66%, and the three-day age group is morethan 7 days and 1 day.

¡¡¡¡The detection results of the 817 broiler of the 817 broiler (H5RE-11, H7, H9) and new cityantibody  levels  in  the  top  three  different  age  stages  of  7  days,  21  days,  and  the  first  threedifferent age stages showed that the 7-day aging source antibody level is generally Between 6to 7 titers, but about 10% of the two diseases of the two diseases are too high, the antibody titeris greater than 10 and the dispersion is large, indicating that the chicken group of these chickmay  have  two  diseases.  21  day-old  chick  influenza  (H9)  and  new  city  antibody  levels  aregenerally between 4 to 6 titers, but about 1/4 of the chicken antibody level is too low, there is arisk of two diseases, avian influenza (H5RE -11, h7) Mother source antibody is less than 4 titers;before  the  bars,  the  maternal  antibodies  have  substantially  disappeared,  avian  influenza  (H9)and  the  new  city  antibody  level  are  generally  5  ~  6  drops.  Between  the  degree,  the  level  ofantibody in some chickens is too low, or too high, the dispersion is large, indicating that thechicken is immune or has occurred.

¡¡¡¡Based on the 817 broiler epidemiology survey and antibody level test results, combinedwith the aquaculture of the 817 chicken farm in Shandong Province, we have strengthened thedetection  and  quality  of  the  vertical  infectious  diseases  of  817  broilers,  and  the  adjustmentoptimized bird flu, new city disease , The immunization procedure of adenovirus, increased theeffort  of  E.  coli  drug  test  and  the  development  of  a  drug  prevention  plan,  and  a  significantincrease in the culture level was significantly improved after the exemplary field promotion.

¡¡¡¡The study further enriched the 817 broiler  epidemiological information in our province,preliminaryly, the common vertical infectious diseases of the city of 817 broilers were deeplyrecognized that the immunodeficiency of important epidemic and the harm of bacterial diseaseswere well developed. Prevention measures will help 817 broilers have effectively preventionand regulate the breeds, improve the level of breeding, and ensure food safety.

¡¡¡¡Key  words :     817  Broiler;  Healthy  Breeding,  Epidemiology;  Antibody  Detection;  DiseasePrevention and Treatment ¡£

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