Diagnosis and Control of Johne's Disease (2003) / Chapter Skim
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Appendix B: USAHA Voluntary Johne's Disease Herd Status Program for Cattle
Appendix B: USAHA Voluntary Johne's Disease Herd Status Program for Cattle
Pages 179-193
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From page 179... ...
In 1993, a task force of the Johne's disease committee of USAHA drafted a model Johne's disease herd certification program (USAHA, 1993~. Some states modified their Johne's disease certification programs to conform to 179
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From page 180... ...
. This model program was developed to assist State Veterinarians and Johne's disease advisory committees, or their equivalent, in each state as they consider implementation of Johne's disease herd certification programs.
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From page 181... ...
these duties include annual herd visits, animal testing, and producer education. All samples for Program testing must be collected by an accredited veterinarian or State or Federal animal health official.
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From page 182... ...
The table in Appendix I shows the number of animals to include in Program ELISA and fecal culture statistical subset testing. State Johne's Advisory Committee: an appointed committee which is the authority responsible for overseeing and coordinating the State's Voluntary Johne's Disease Herd Status program.
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From page 183... ...
All samples for Program testing must be collected by an accredited veterinarian or State or Federal animal health official and submitted to an accredited laboratory. It is recommended that a farm or herd risk evaluation be done before completing herd testing for Level 1 Standard Track or Level 2 Fast Track.
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From page 184... ...
; Future Program tests must be performed in accredited laboratories 2. Risk assessment of the number, source, and testing history of herd additions made after the first qualifying test Additionally, producers wishing to use the Fast Track must make the required written statements for the time period (five years)
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From page 185... ...
Program Levels Flow diagrams depicting progression through each status level appears as Appendix II. Percentages on the diagrams represent mathematical estimates of the probability herds at each level or certification are free of Johne's disease infection based on serial testing.
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From page 186... ...
The fast track will allow herds to reach Level 4 in two years with three tests. Level 2 - program entry requirements for Fast Track met, negative ELISA statistical subset test of second or higher lactation animals (see Appendix I for the Herd Subset Testing chart)
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From page 187... ...
Level 4 status is maintained by achieving negative ELISA results on 30 second or higher lactation animals every 10-14 months. Herd Additions Heifers that have not calved and bulls less than 2 years of age: from herds of equal or higher program levels -orfrom program herds which are one level below the purchasing herd.
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From page 188... ...
All semen used in program herds must be processed according to Certified Semen Services standards. Changes in Herd Status Herd additions: The status of the herd will revert to the status of the lowest animal if Program herd addition requirements are not met.
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From page 189... ...
Six separate fecal cultures from the animal on samples collected not less than 30 days and not more than 45 days apart The herd Johne's disease status will be suspended until all testing is completed. Only negative results on all tests on all samples will allow the herd to advance or retain its Program Level.
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From page 190... ...
The cattle to be tested are in second or higher lactation 2. For these calculations, 25 percent test sensitivity of the ELISA and 40 percent test sensitivity of the fecal culture were assumed (this were the consensus estimates of the Herd Status Committee for subclinically infected cows in first of higher lactation, and no changes were made for the older population sampled 3.
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From page 191... ...
191 = positive test = negative test J ~Herd~ | status \unknown / ~/70% ~: ~ ~ ~ Level ~ ~ 1 , ~ 85°/c \~ \9: ~ Level A Annual herd monitoring to stay at same level ~ 2 ) < ' A ~95% ~ 3 ~ ~ A ~98% Annual herd monitoring to stay at same level \ ~ ~ .
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From page 192... ...
APPENDIX B Voluntary Johne's Disease Herd Status Program Fast Track = positive test \ herdsJ \ `/'Voluntary-\` \ withdrawal \ from \ \ Program,/ \ \; ~Owner: / declaration \ / that no cows were seen or diagnosed with Johne's \ disease in past / \ 5 years / . ~ ,70% ' Level )
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From page 193... ...
Fecal culture on 30 second or higher lactation cows Negative test The interval between tests is 10 to 14 months, except for confirmatory testing.
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