Aside from drenches at one or two strategic times the mob’s average worm egg count should be the basis for other drenching decisions.
Structured reading
For those who like to see all the information and simply read through it in order. Each heading is a link to a page of information—the dot point provides a summary of the page.
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Checking a mob of goats for worms with a WormTest
How-to guide to collect and submit samples for a mob worm test to a laboratory.
Worm egg counting
How worm egg counting is carried out.
Assessing worm burdens without a WormTest
Other ways to assess whether goats have worms and what level of worms exist.
Collecting dung samples from individual goats (optional)
How-to guide on collecting dung samples from individual goats (for drench resistance tests or genetic assessment of worm resistance).
Worm testing for goat stud breeders (optional)
How-to guide for goat stud breeders who want to gain worm egg count or dag breeding values for individual goats.
Question and answer
For those who prefer a problem based approach to learning, answer the following questions.
Each of the questions below links further down the page to the answers.
Questions:
- How many individuals should be sampled for a WormTest?
- Name a standard time when you should WormTest.
- What 2 things does a larval culture tell you and how these help you make a drenching decision?
- Name a situation when you would drench without a WormTest?
- You can use the WormTest from one mob to make drenching decisions about similar mobs. For every mob you test, how many other mobs could this represent?
- If only very few goats (less than 2%) in a mob appear to be badly affected by worms: ? What could be a cause of this? What action would you take?
Answers:
You can also click on each question below to go to WormBoss pages with related information.
1. How many individuals should be sampled for a WormTest?
Collect the number of samples per mob as recommended by your laboratory (ideally this would be from at least 20 goats—if you are doing your own worm egg count on farm, try the following ‘bulk collection’ method.
Bulk collection method:
When conducting your own worm egg counts on farm:
- Collect three pellets per adult pile (or the equivalent amount if soft or runny) or five for weaners.
- Collect from at least 20 dung piles.
- Where Haemonchus (barber’s pole worms) are an issue, and if there are over 200 goats, collect from each of 40 dung piles.
- Collect all dung into one container
- The dung then needs to be mixed extremely thoroughly.
- Conduct your worm egg count using a sub-sample from the bulk mixture.
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2. Name a standard time when you should WormTest.
- Goats showing signs that suggest a worm infection
- Prior to weaning kids (or at 4–6 months old if a set weaning does not occur)
- 6 weeks after rain that has resulted in a green pick of annual grasses and herbage
- 4–6 weeks after goats have been congregating in small areas
- Each 2–3 months for goats on bore drains/irrigation channels when there is little other paddock feed
- In north-west Victoria and the western Riverina during November/December and February
- In southern Queensland, if autumn and winter were wet and the spring and summer is wet or likely to be wet
- Before mustering for management events
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3. What 2 things does a larval culture tell you and how these help you make a drenching decision?
A WormTest refers to a ‘Worm Egg Count Test’ or ‘WEC test’; it will identify the number of worm eggs in faeces, which is a good indication of the worm burden of the goat.
Some laboratories can also perform a ‘Larval Culture’ (also called a ‘Larval Differentiation’) to identify the types of worms present and their proportion (the importance of this varies according to your location).
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4. Name a situation when you would drench without a WormTest?
In this region there are only three situations when drenches should routinely be given.
- When bringing new goats onto the property
- When extensive flooding is predicted to isolate goats
- When nodule worm has been found to be a problem on your property (pimply gut)
Otherwise, always conduct a WormTest before drenching goats.
Use the results with the Drench Decision Guide to decide whether to drench and when other WormTests should be done. A larval culture (larval differentiation) with the WormTest is particularly useful in areas or seasons in which summer rainfall occurs and barber’s pole worm is a risk.
Young bucks under 2 years and weaners are highly susceptible to worms and should be regularly monitored.
Drench Decision Guide – Rangelands
5. You can use the WormTest from one mob or herd to make drenching decisions about similar mobs. For every mob you test how many other mobs could this represent?
Ideally each mob should be tested individually, as there are usually differences between paddocks in the favourability for worm survival, the number of worm eggs being deposited by different mobs, and the time since a drench was given. However, if there are a number of mobs that have the same drenching history, same class of goats and very similar paddock type (including recent level of contamination from worms) then one mob can represent two others (i.e. test one in every three similar mobs).
Testing representative mobs saves the cost of testing all mobs, but carries the risk that the result may not be representative. If in doubt, test additional mobs.
Testing individual mobs is suggested for Western Australia, South Australia, Victoria and Tasmania.
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6. If only very few goats (less than 2%) in a herd appear to be badly affected by worms: What could be a cause of this? What action would you take?
If less than 2% of a herd are showing signs that include pale inside eyelids and gums, bottle jaw, lagging or collapse, you should treat these affected goats immediately with a drench suitable for barber’s pole worm, but also sample and test the remainder of the herd now. If these signs are not visible, but a few goats are scouring badly, test the herd now. In both cases, use the results with your Drench Decision Guide to decide whether the whole herd should be treated.
When less than 2% of a herd show signs of worms these are the possible causes:
- These goats were not drenched when the rest of the herd were (e.g. didn’t get mustered, were missed or spat out the drench in the race, strayed in from another herd). Their worm egg count may be a lot higher than the rest of the herd.
- These goats are suffering from some other illness or injury that has reduced their immunity and they have acquired a larger worm burden than the rest of the herd. Signs of another problem may be evident.
- These goats are the most susceptible in the mob because of lower worm-resistance and the herd has been tested just when these first goats are starting to show signs.
- These goats are not actually affected by worms at all. Instead, anaemia could be the result of liver fluke and scouring could be from coccidiosis or excess lush feed.
In all of the above situations, a WormTest on the remainder of the herd (don’t include these badly affected goats) to determine the worm egg count will inform your decision of whether to treat the rest of the herd.
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