WRML. WormfaxNSW-January. Managing drought. Incorporating Turning the Worm

To WormMail (WRML) mailing list

WRML. WormFaxNSW-January. Managing drought. Incorporating Turning the Worm

WormFax – January issue

This should be up on the web soon: http://www.dpi.nsw.gov.au/aboutus/resources/periodicals/newsletters/wormfax

WormFax is a monthly round up of WormTest results for sheep from NSW’s two major veterinary parasitology labs.

As expected, given drought conditions across much of the state, worm egg counts (WECs) are generally low.

HOWEVER, there are some mobs with high WECs. Some examples:

Armidale. Hoggets. Mean WEC = 6000 eggs per gram of faeces (epg). 67% Haemonchus; 33% Trichostrongylus. (What do these worm names mean? See: http://www.wormboss.com.au/worms.php)

Armidale. Ewes/lambs. Mean WEC = 10,000. 100% Haemonchus. (What’s happening here? You can bet pounds to peanuts that inadvertent use of ineffective drenches (flying in the dark) is part of the story).

Riverina. Rams. Mean WEC=4040. 80% Trichostrongylus; 20% Teladorsagia. (Surprised? Did you expect a count this high would be dominated by Haemonchus? This shows the value of getting a ‘worm type’ / larval differentiation done).

South East. Ewes. Mean WEC= 2600 epg. 97% Haemonchus.

What WECs trigger a drench? See the DDG for you region e.g. http://www.wormboss.com.au/tests-tools/management-tools/drench-decision-guide/tablelands-slopes.php

So, worms are still important in droughts. For example, in a ‘sacrifice’ paddock (where livestock are kept for supplementary/drought feeding) after showers of rain.

Also, consider selection for drench resistance in droughts/dry spells. It is thought that there is higher selection for drench resistance when drenching during dry times, because, like drenching onto very clean paddocks, there are very few worms in refugia.

See this article by my WormBoss colleagues: http://www.wormboss.com.au/news/articles/drench-resistance/use-refugia-to-prolong-drench-life.php Take the time to read this: it’s very important.

[Refugium (plural: refugia).
Biology: an area in which a population of organisms can survive through
a period of unfavourable conditions, especially glaciation. Origin 1950s;
from Latin, literally ‘place of refuge’. Oxford Dictionary of English).

(In this context, the ‘unfavourable
conditions’ refers to exposure to (lethal or injurious doses of) anthelmintics)].

You don’t want to drench unnecessarily during droughts, but you do want to drench if necessary. And, when you drench, you need to check the drench was highly effective. For all these, the tool you need to use is WormTest.

http://www.wormboss.com.au/tests-tools/tests/checking-a-mob-of-sheep-for-worms.php http://www.wormboss.com.au/tests-tools/tests/checking-for-drench-resistance.php

WormMail (WRML), WormFax and Turning the Worm (TTW)

WormMail is an informal and more or less weekly newsletter. It also serves / has served as a conduit for WormFax and TTW.

WormFax is a monthly summary of sheep WormTests from around NSW. It is published to the NSW DPI website. Notice of a new monthly WormFax is made through WormMail.

Turning the Worm (ISSN 1442-8466) is/was a more formal and less frequent newsletter. It was published to the NSW DPI website, and also sent out via WormMail.

There have been no new TTWs since 2011; WormMail has taken its place. TTW will be ‘taken down’ from the NSW DPI website, but archives will be kept deep in the bowels of some DPI server, and the editor’s (my) hard drive (where things are equally hard to find).

An index of TTWs is attached.

How droughty?


Percentage of mean rainfall, Aug 2013 – Jan 2014

‘Managing drought’ – it’s on the NSW DPI website

Managing drought: http://www.dpi.nsw.gov.au/agriculture/emergency/drought/managing

Other – multi-tasking, brain function and productivity

This was mentioned in a recent WRML. Here is more. Read this and the references while doing one of your more mundane /less important tasks. 🙂





Turning the Worm-INDEX-1997-2011.doc