Ovine Pulmonary Adenomatosis / Jaagsiekte

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Iain Richards — Sat, 07 Jan 2017 21:04:07 GMT

[quote user="Michael Woodhouse"]

http://www.biobest.co.uk/news/articles/opa_pcr.html

Just posted today.

[/quote]

Interesting. I'll read that in more detail next week. Then ring Biobest! Scanning is well worht it, but this might save time (and back!)

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Michael Woodhouse — Wed, 04 Jan 2017 13:39:32 GMT

http://www.biobest.co.uk/news/articles/opa_pcr.html

Just posted today.

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Seadna — Tue, 03 Jan 2017 19:11:39 GMT

[quote user="Michael Woodhouse"]A dramatic decrease in prevalence over the three years, so we are finding much fewer sheep with lung lesions now, than we were 3 years ago when we started. Maybe not clear from what I said.[/quote]

Nope, you were clear. Turns out I don't read so good, I read 'increase' instead of 'decrease'.

We export an awful lot of sheep to Ireland and to Scotland and I'm having a hard time reconciling my duty to 'examine' the sheep whilst also signing paperwork saying that to the best of my knowledge they are free of infectioius diseases. How far is an examination supposed to go?! :/

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Michael Woodhouse — Tue, 03 Jan 2017 18:59:42 GMT

[quote user="Seadna "]Michael are you saying here that those affected flocks have increased prevalence of lesions despite your scanning them and culling early offenders? Or have you only recently begun to scan? [/quote]

A dramatic decrease in prevalence over the three years, so we are finding much fewer sheep with lung lesions now, than we were 3 years ago when we started. Maybe not clear from what I said.

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Seadna — Tue, 03 Jan 2017 18:47:10 GMT

[quote user="Michael Woodhouse"]We do some and the worst affected farm has seen a dramatic decrease in prevalence of lung lesions over the 3 years.[/quote]

Michael are you saying here that those affected flocks have increased prevalence of lesions despite your scanning them and culling early offenders? Or have you only recently begun to scan?

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Seadna — Tue, 03 Jan 2017 18:45:05 GMT

Some scanning courses coming up here too this year so the boss will be going to the first one and I'll be going to the next hopefully. Everyone involved says it's very simple to identify the early lesions so hopefully it becomes useful to us in the future in what I am convinced is going to be a disastrous few years for sheep in NI :)

...the thought of going on-farm and scanning 2-300 sheep though

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Michael Woodhouse — Sun, 01 Jan 2017 18:02:00 GMT

[quote user="Seadna "] The science is so far behind on this one and there is a huge culture of silence among farmers. [/quote]

I agree with you on the silence amongst farmers part. They are a very secretive bunch of people, with shocking standards of biosecurity. So common sharing rams or teasers. The pedigree side is particularly incestuous. It's amazing that everyone doesn't have everything. I think sometimes the issue is people want to keep very quiet about it, because they worry the effect it will have on them selling breeding animals to others. Ultimately someone who knows their disease status is still a safer bet then the unknown, but that's hard to get across.

Moredun are doing some work looking at OPA and looking at PCR testing in the live animal and it doesn't work that well. It looks like high numbers of false negative results - so useful to decide on a group of thin sheep is the disease is on farm, but not useful in the diagnosis of the individual animal. They don't respond serologically, so an antibody test is out, as [probably] is some kind of vaccine.

There are a number of practices using ultrasound to screen flocks, looking for early lesions. It's not hard, gets you on farm, and allows affected animals to be removed from the flock whilst healthy. In theory should reduce spread and allow a good cull price for an animal in early stages of disease. We do some and the worst affected farm has seen a dramatic decrease in prevalence of lung lesions over the 3 years.

http://veterinaryrecord.bmj.com/content/177/14/366.abstract

I can email you the full paper if you can't access it.

The Sheep Vet Society and Moredun have run a number of CPD courses teaching the technique, but with practice and looking at some images it is quite easy to teach yourself. Especially if you can PM some of the worst cases to confirm (this is what we did).

http://www.sheepvetsoc.org.uk/news/vet-cpd-opa-scanning-15dec

We find a lot of both OPA and Johne's and a scattering of MV. Lots of denial. Not sure I have a great solution.

Both Julian Earl and Iain Richards are more 'sheepy' than me so may know more. My wife has done most of the scanning and is particularly interested in OPA so I can ask her anything you have very technical.

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Emily Rainbow — Sun, 01 Jan 2017 16:57:21 GMT

Hardly seen it until one case last month in a bought in ram. Not sure where he came from unfortunately.

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Noweia — Sun, 01 Jan 2017 11:15:45 GMT

Used to get runs of it coming through certain abattoirs in Scotland, more common than you'd think.

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Seadna — Sun, 01 Jan 2017 10:23:29 GMT

[quote user="David Mills"]Is this the one where the classic picture is fluid pouring out of the nose into a bucket?[/quote]

That's the one, and that's about the only diagnostic test we have for it, which is....unhelpful to say the least. Name is crap, I try to avoid saying it

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

David Mills — Sat, 31 Dec 2016 20:00:34 GMT

Is this the one where the classic picture is fluid pouring out of the nose into a bucket?

Great name for a disease. But awful for the animal/farmer.

RE: Ovine Pulmonary Adenomatosis / Jaagsiekte

Michael Woodhouse — Sat, 31 Dec 2016 18:33:56 GMT

Yes, we see lots of it. Vastly underdiagnosed. 4% in a fallen stock study in Northern England.

On phone, will give you a proper reply next year from my laptop