Download - Experience with clearing herds for BVDV infections Practitioner Jørgen Katholm Vivild Denmark
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Experience with clearing herds for BVDV infections
Practitioner Jørgen Katholm
Vivild
Denmark
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Herds with PI
1988-1994
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Herds with PI
1988-1994
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Herds with PI
1988-1994
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Herds with PI
1988-1994
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Herds with PI
1988-1994
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Herds with PI
1988-1994
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Herds with PI
1988-1994
(2 beef herds)
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Herd symptoms months from birth of PI calv-9 - -6 Recycling-9 - -6 Diarrea, cows, reduced milk
Dead cows -6 - -4 reduced immunity, severe coliform mastitis, ringworm,
pyogenes infections. High Bulk milk cell count
-6 - -1 Abortion storm-6 - -2 week calves born, calf diarrea, (Seropositive calves) -7 - 0 Growth retarded calves-1 - 0 malformated calves, blind-1 - 0 Stillbirth 0 - 2 PI calves-1 - 2 Retaind placenta 0 - 3 Week calves, diarrea 1 - 4 Lunginfections 2 - ? Sudden death of PI calves Mucosal Disease
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BVD Eradication
Individual marking: Ear tags (database)
Trade restrictions Biosecurity (status of BVD)
Blood testing Relaibel tests PRICE
Education of vets. Brownlie, Alenius, KalisPractising Vets
Education of farmers Vets from farmer organisationsLocal vets
Trend setting Farmers Free of infectionInfected - Time scale of disease
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All Herds infected and clean
1994 Trend setters
Free 5-10 years
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First eradication 1990-91
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BVD Eradication plan1990 Test all cattle for antibodies (PRICE – Holland 1/3)
Test all negative for virus by virusculture
Herd status antibody in 5 bloodsamples
1994 Test all cattle > 3 month for virus (ELISA)
Until 1 year after last PI
no antibod testing (PRICE)
Farmers organisation started volontary BVD-Status
Milk: 4 times/year Beef 3 blood for antibodies/year
Infection stops to spread
BUT 3 farms bought seropositive heifers calving with PI
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All Herds infected and clean
1994
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Beef Herds Infected 1996
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Beef Herds in VivildTotal infected 10herds 8 with PI
0
20
40
60
80
100
120
140
160
1996 1997 1998 1999 2000 2001 2002 2003
infected Beef herds herd size
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Beef Herds Infected 1999
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Last PI Beef herd killed 8 dec 1999
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Milking Herds infected
and clean
1994
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Milking Herds Infected 1995
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Milking Herds in Vivildtotal 54 infected 40 with PI
0102030405060708090
100
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
infected milking herds herd size
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Milking Herds Infected 1999
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Milking Herds Infected
2000
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Last PI killed 16 jan 2001
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All Herds 2003 Free
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Normal calves negative 8 month
1 HF calv positive 10 months negativ 14 months
1 beef calv positive 12 months negativ 13 months
Maternel antibodies
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BVD antibodies in Charolais young stock939 930938 925937 931920 915934 919929 916911 926921 923912 933 935 922913 924936 917910 927918 27832-892940928914
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BVD antibodies in Charolais young stock
22/12 1998 7 calves dehorned + 1 BVD antibodies939 930938 925937 931920 915934 919929 916911 926921 923912 933 935 922913 924936 917 negativ910 927918 27832-892940928914
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BVD antibodies in Charolais young stock
5/3 1999 3 BVD blodsamples for status
939 930938 925937 931920 915934 919929 916911 926921 923 positive912 933 positive935 922 positive913 924936 917 910 927918 27832-892940928914
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BVD antibodies in Charolais young stock
18/3 1999 5 BVD blodsamples
939 930938 925937 931920 915934 919929 916911 926921 923 positive912 933 positive935 922 positive913 924936 917 positiv910 927918 27832-892 negative940928914
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BVD antibodies in Charolais young stock
27/4 1999 BVD blodsamples all herd
939 negative 930 negative938 negative 925 negative937 negative 931 negative920 negative 915 negative934 negative 919 negative929 negative 916 negative911 negative 926 negative921 negative 923 positive912 negative 933 positive935 negative 922 positive913 negative 924 negative936 negative 917 positiv910 negative 927 negative918 positiv 27832-892 negative940 negative928 negative914 negative
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Conclusions
• Happy farmers will spread the news• Biosecurity - stops the infection • Eradication - straight forwad
When going for the virus and the tests are reliable
• Big herds maybe prolonged eradicationseperated flocks selling of young calves
• No spread from Bull stations by semen• Injections with infected medicine can cause acute
infection
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Thank you
For BVD eradication