Confessions of the Sheep/Beef Cattle/Pig Addicts

Tested positive first time then clear second time but appeared on the map
I would class inconclusive reactors and false positives almost as one. The sensitivity interpretation alters the likelihood of more false positives and more reactors at 25% rate higher than the interpretation for normal surveillance testing
In other words once you get some reactors then it’s harder to get clear
 

andyt87

Member
Livestock Farmer
Location
Glamorgan
I would class inconclusive reactors and false positives almost as one. The sensitivity interpretation alters the likelihood of more false positives and more reactors at 25% rate higher than the interpretation for normal surveillance testing
In other words once you get some reactors then it’s harder to get clear

Yeh I understand that- as soon as you get a reactor in the test, all previous cattle that had been clear on the day get reassessed under Severe Interpretation.

Last time we went down was first time in 15+ years so no animals remained from last restrictions plus changed from dairy to suckler. 2 animals on a pre movement test, then 3 on the herd check test. One IR on 1st 60 day, who then went clear on 2nd 60 day. 2 of the second 3 had calved and calves had sucked, tested clear multiple times since.

None of the 5 slaughtered showed lesions and all negative on cultures. Whether any were false positives is difficult to say though as it's down to time since exposure.

Just surprised a non restricted herd that had an IR which then tested clear was put on the map
 

andyt87

Member
Livestock Farmer
Location
Glamorgan
I think the test is 99.4% accurate or something the vet was telling me. Basically means if you have 1000 cows you will never come off restrictions due to false positives

In theory maybe. Local 1500+ milking herd and replacements is clear though in a TB1 area. They were down 2010-2013 and 2019-2020 but are obviously clear now.
 
Yeh I understand that- as soon as you get a reactor in the test, all previous cattle that had been clear on the day get reassessed under Severe Interpretation.

Last time we went down was first time in 15+ years so no animals remained from last restrictions plus changed from dairy to suckler. 2 animals on a pre movement test, then 3 on the herd check test. One IR on 1st 60 day, who then went clear on 2nd 60 day. 2 of the second 3 had calved and calves had sucked, tested clear multiple times since.

None of the 5 slaughtered showed lesions and all negative on cultures. Whether any were false positives is difficult to say though as it's down to time since exposure.

Just surprised a non restricted herd that had an IR which then tested clear was put on the map
They usually put us straight into tb1 3km 6 months radial testing if they are genuine positives
That’s if they have even been genuine positives
Some have appeared on the maps but not set that ball away in the past
Must have passed second test
Not sure who’s discretion that’s under
Some I know the people so have the info
 

Chicken richard

Member
Mixed Farmer
IMG-20231217-WA0010.jpg


anyone been out to see the tractor light shows?? Tonight
 

johnspeehs

Member
Location
Co Antrim
I've had 3 cows to abort for schmallenburg and 1 positive for it still in calve as I have had blood test gor it and vet said it could be a big thing in sheep this year last bad year for it was 2013 😔

I was watching a you tube video from Baldys farm and he was very disappointed with his cow scanning, he reckoned nearly 25% empty, wonder could smb be a possibility there, not sure what area he is in though, would it cause barren cows?. seems pretty good operator.
 

adda

Member
Livestock Farmer
Location
mid wales
I was watching a you tube video from Baldys farm and he was very disappointed with his cow scanning, he reckoned nearly 25% empty, wonder could smb be a possibility there, not sure what area he is in though, would it cause barren cows?. seems pretty good operator.
My vet said there is a herd down Devon or Cornwall way got 70% aborted to it 😔
 

thorpe

Member
To me the whole country should be 12 month testing. With a better bloody test than the skin one. No post or pre movement testing, just every herd every year. Would make it a more level playing field all around
weve got post movment testing tomorrow, what's that sh1t all about:scratchhead:? going to have it every couple of month's, just what we want when we get busy on field work! :mad:
 

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