Consider checking the drench you are currently using to see if it is still 100% effective  on your property. If not you could be wasting a lot of time and money.

Using the before and after method is really simple and it gives you a lot of information. Much more than the sales rep simply offering you a drum saying this product is really good and kills everything! Because for many reasons drenches do become ineffective overtime and with overuse. So the idea is simply to take a sample from the mob and get it tested then drench the mob. Send a second sample in from the mob taken 10 to 14 days later for testing and compare the results. a 100% kill is the ideal but if not you then have the information to make an informed choice when buying drench.

Now of course their are variations on this theme for example with sheep; you could identify  10 animals in the mob, mark  them in a way so that you can ID them in 10 days time. Drench them and take samples from this group and send for testing. In 10 to 14 days get samples from this group again and send it to us for testing indicating it's a resistance test.  We will send the report and the efficacy of the drench can be calculated. 

Note: those 10 sheep can run back with the mob in between sampling as the worm life cycles are such that if you collect the second sample in the 10 to 14 day post drench period you are testing resistance not reinfection.

Hence if you wish to test more than one drench poduct just ID another 10 sheep and do the same. It's up to you how many drenchs you can test using this method.  Of course you could do the same thing but keep the animals in separate paddocks till you retest, this will suit sme and can save on redrafting etc but have available padddocks can sometimes be an issue.

Any questions on setting up a resistance test be sure to give us a call.