A worm egg count (WEC), or faecal egg count (FEC) as it used to be called, is a laboratory procedure used to calculate the worm burden of an individual animal or a set number of the mob or herd (Pooled Test). It identifies how many eggs per gram are in the animals faeces, and it is essential information that you need before you can implement a successful de-worming program.

Faecal egg counting can be performed on animals in two ways:

Individual Worm Egg Count (15 individual samples)

Individual samples are collected in containers from different animals and each sample is tested. This will provide you with the average egg count and the range. This provides you with information about the variability of numbers of strongyle worm eggs present in the dung of the mob or herd. This is most useful when doing a post drench check (10 days after drenching, to test the effectiveness of the drench).

Pooled Worm Egg Count (2 pooled samples)

In this test, 15 individual samples are collected in containers from 15 animals and then these results are pooled at the lab into 3 groups of 5 animals in each group to give a mob average number. This is a cost effective technique, most useful for monitoring trends in a mob or herd.

Our laboratory provides a sample collection kit which is available to purchase here These ‘worm egg counting kits’ include instructions, a test acquisition form, sample containers/bags, gloves and a reply-paid express mailing pack to return your samples to the laboratory for testing. The samples will be processed within 24 hours of arriving at the lab.

Collection information


microscope parasitology