WRML.2015-02-26. WormFaxNSW-January;ParaBoss News-February 2015-incl.excerpt-Rad Nielsen; Fat is back?

To WormMail list. ~ 400 subscribers. (Recipients undisclosed)

In this issue:

  • WormFaxNSW-January
  • ParaBoss News-February 2015-incl. excerpt-Rad Nielsen
  • Fat is back?

WormFaxNSW for January is on-line

WormFax is a summary of sheep WormTest results from around NSW.

The data comes from two labs: NSW DPI’s State Vet Lab at EMAI, Menangle, and from Veterinary Health Research, Armidale.

More information and data: http://www.dpi.nsw.gov.au/aboutus/resources/periodicals/newsletters/wormfax

ParaBoss News

Also check out ParaBoss news (update on worms, flies and lice for February 2015).

Experts from various regions comment on what is happening worm-wise in their patch.

Below is an example: Rad Nielsen gives district-specific comments for the Armidale region:

“The generally good rain in January has stimulated worm activity in the north of the state. The VHR Laboratory has identified some very high worm egg counts over the past few weeks, mean worm egg counts (WECsin the order of 3–4,000 eggs per gram of faeces (epg) being seen on a number of occasions. Interestingly, no worm symptoms had been identified by the graziers in several of these cases, despite mustering and close observation. This highlights the fact that sheep may carry high worm burdens of Haemonchus without necessarily expressing clinical signs. Worm monitoring allows this condition to be identified and appropriate drenching conducted before a “crash” occurs.

A number of clients have maintained their sheep in a low-worm status despite the favourable environmental conditions for worms. The key to their success in nearly all cases has been the adoption of rotational grazing, combined with varying degrees of co-grazing with cattle. A case in point is a Walcha district property that has a mob of 4,500 ewes which have not been drenched for worms since mid-September. Their most recent monitor (mid Feb) showed that they had a mean WEC of only 80 epg.

A recent submission highlighted the importance of establishing the nature of the worm infection you are dealing with and being aware of the limitations of the various drenches. Lambs treated with naphthalophos and levamisole continued to be showing illthrift (and a number dead) one week post treatment. A worm egg count was performed, which confirmed a significant Black Scour Worm infection (mean WEC of 800 epg). It is not uncommon for such a drench combination to be largely ineffective against scour worms.

Dr Rad Nielsen, Veterinary Health Research, Armidale”.

It’s worth subscribing to ParaBoss news if you haven’t done so already.

Fat is back?

British nutritionist/researcher Zoë Harcombe and colleagues have just published a review which challenges the basis of dietary fat guidelines.

Harcombe et al, Evidence from randomised controlled trials did not support the introduction of dietary fat guidelines in 1977 and 1983: a systematic review and meta-analysis. http://openheart.bmj.com/content/2/1/e000196 .

However, various experts have challenged the findings. For example, see here: http://www.timeslive.co.za/thetimes/2015/02/11/we-ve-been-sold-a-big-fat-lie

Regards,

 

SL, 2015-02-26

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WRML.2015-02-25. sheep worm control in brief

WRML.2015-02-25. sheep worm control in brief. what about cattle worms?

This is a ‘quickie’ WormMail.

A journalist who is writing material on sheep management, including parasites, wanted some input from me on this sort of thing:

​’What are the main worms to watch out for? What are the signs the animal is affected, what is the recommended treatment once affected?
Prevention methods – from medical to hygiene and husbandry tips/requirements.’

How do you cover worms in what you know must be a brief treatise?

I thought about this as an answer: ” Go to WormBoss.com.au, and start at Your Program.

Also check out the NSW DPI webpages on parasites: http://www.dpi.nsw.gov.au/agriculture/livestock/sheep/health . “

But, I gave this more expanded answer, still trying to keep it short(ish) if not sweet:

The three main points for sheep worm control in Australia, i.e. the 3 Ws (these are your three amigos):

  • WormBoss. The right worm control program for your region. Click on Your Program at wormboss.com.au
  • WEC before you treat. How do you know when you need to drench? Do a worm egg count before drenching, apart from the routine drenches recommended for your area (in Your Program) e.g. in the summer rainfall area – tablelands and slopes – of NSW, the routine drenches are: pre-lambing, and lambs at weaning.
  • WEC after a drench, 10 days after. In WormBoss, this is called DrenchCheckDay10. The idea is to monitor drench efficacy. The great majority of producers don’t really know what drenches are working well on their farm.

Your Program is very practical and does not assume or require in-depth knowledge. If people follow this, they will be doing best practice in drenching, drench resistance management, grazing management, nutrition and genetics (breeding worm resistant sheep). Your Program includes guidelines on WECing – all you need to know in fact – but I added WECing separately for emphasis.

Other comments:

The most important worms of sheep in Australia:

Round worms

Barber’s pole worm (Haemonchus) – especially but not only in summer rainfall areas. Blood sucker – anaemia, death

Black scour worm (Trichostrongylus) – all areas. Ill-thrift, variable degrees of scouring (diarrhoea); occasionally death

Small brown stomach worm (Teladorsagia (Ostertagia)) – most areas, less so in Qld – Effects: as for black scour worm

Liver fluke – certain areas – e.g. in NSW, localities in tablelands, slopes, coastal areas and some irrigation areas. Blood sucker. Anaemia, sometimes jaundice, ill-thrift, deaths. Increased susceptibility to black disease (Clostridium novyi).

Money matters

Worms cost heaps. They are the number one sheep health problem in Australia. In most areas, most (~80%) of the cost is from production losses, i.e. more or less invisible… (so, you must do regular WECs …. ). The next most important: flies and lice. (Check out ParaBoss.com.au).

Drench resistance

Resistance of sheep worms to drenches is VERY common and VERY widespread on Australian sheep farms. The only two drench actives not affected are the new ones, introduced in the last 5 years: ‘Zolvix’ (monepantel; released in AU in 2010), and ‘Startect’ (derquantel (new) + abamectin (not so new); released in 2014).

Generally resistance to new drenches happens within 3-5 years of release. Regularly monitor efficacy of all drenches, new or old.

Most producers don’t know for sure what drenches are effective on their farm – because perhaps only 5-10% test their drenches – e.g. by using DrenchCheckDay10, or DrenchTest. (See wormboss.com.au).

What about cattle worms?

After chewing the fat about sheep worms with a vet colleague, who is moving from one speciality to another, she asked about where to get information on cattle worms.

My response..

“Cattle worms…  well there is a skimpy Primefact on this – also needs updating – at the NSW DPI website.
Also you might look at the cattle parasite atlas on the MLA website.
 I -and others- have suggested that WormBoss might expand to include worms of other livestock.   That would be good.”
Then there are such books as that written by former NSW DPI vet, Malcolm Smeal. (“Parasites of cattle” – MG Smeal.  358 pages; Publisher: University of Sydney, Post Graduate Foundation in Veterinary Science (now CVE), 1995. ISBN-10: 0646241362 ISBN-13: 978-0646241364. (‘Possibly out of print)).

 

 

SL, 2015-02-25 AM

…now, back to horse worms…

WRML.2015-02-13. ‘Great to have new drenches, but don’t assume ….

WRML.2015-02-13. ‘Great to have new drenches, but don’t assume ….

It is good to have new/novel drench actives for use in sheep in Australia.

These of course are monepantel (in ‘Zolvix’) and derquantel (in ‘Startect’, in combination with abamectin).

For more information on these drenches, see here: http://www.wormboss.com.au/drenches.php

BUT! … keep in mind that a pillar of good worm control is to monitor the efficacy of drenches, firstly by DrenchTesting and, in between DrenchTests, with regular DrenchChecks (a worm egg count 10 days after a drench).

And don’t just check the older drenches. Keep tabs on the new drenches as well. Assume nothing.

You may have read this recent article on the newest of the new drenches. Read it again to be refreshed on the general principles involved.

http://www.wormboss.com.au/news/articles/drenches/the-fit-for-startect-in-wormboss-regional-worm-control-programs.php

Regards,

SL

 

WRML.2015-02-09.Posters for ​morphological identification of the common L3 worm larvae of small ruminants and cattle

To WormMail mailing list.

Re: Posters for ​morphological identification of the common L3 worm larvae of small ruminants and cattle

Well-known South African parasitologist Dr Jan Wyk is kindly sharing this resource with all who are interested. This will be of most value for those working in parasitology labs, but also of interest to others who are more field-oriented in their pursuit of worms.

Apart from that, the posters look very nice, a suitable adornment for the walls of any office, living room etc.

Regards

Steve

2015-02-09

“Dear Friends,

Below I copy a website address for a set of posters developed from the following article: Van Wyk & Mayhew, 2013. Onderstepoort J. Vet. Res., 2013. http:// dx.doi.org/10.4102/ojvr. v80i1.539.

The posters are free of charge, can be printed in a variety of sizes and are meant for use in laboratories, for training in morphological identification of the common L3 of small ruminants and cattle, or as reference in routine identification or whatever.

The posters are not designed for changing without input by us, but can quite readily be modified by Estelle Mayhew and the text of the website by Linda Venter, and I should very much appreciate any suggestions you may have for improvements, correction of inaccuracies, addition of tables of measurements (as in the literature, for instance as in the 2004 article by myself, Michael and Cabaret, in Vet. Parasitol.), etc. – as anyone with some experience with morphological identification of L3 will know, it is notoriously difficult to demonstrate differences between the larvae of the different genera with any degree of accuracy. Hence it is likely that modifications could be required, especially since the shapes of the “heads” of the larvae are drawn from photos of the various L3, but were somewhat subjected to modification from own experience, since the exact outline of L3 photographed under high magnification is often relatively distorted and at low magnification I’ve found it difficult to get the shapes satisfactorily duplicated in figures.

Website:
http://www.afrivip.org/education/livestock/selected-helminths/helminth-ruminants/hel-rum-posters/2014

With the best of wishes,

Jan”

Jan VanWyk