system or could have potentially not got the correct dose, so by testing a group of animals you may get more accurate information for the herd as a whole.
(Pretreatment FEC – Posttreatment FEC) x100= Pretreatment FEC % FEC reduction
Dewormers that produce over a 90% FEC reduction are said to be highly effective. If the Fecal Egg Count reduction is less than 50%, the product can be said to be no longer effective. Parasite resistance usually develops over a long period of time. Doing FEC reduction test allows you to monitor over time. If you begin to start seeing FEC% declining under 80%, you may want to start doing FECRT every few months to monitor the decline. In that case, you may consider changing to a different class of dewormers. If resistance is developing to multiple types of dewormers, you may also use copper oxide wire particle boluses or use “cocktail” strategies of giving multiple dewormers at once. You should discuss all specific treatment recommendations with your herd/flock veterinarian before giving any treatment to small ruminants.
reduction test allows you to monitor over time. If you begin to start seeing FEC% declining under 80%, you may want to start doing FECRT every few months to monitor the decline. In that case, you may consider changing to a different class of dewormers. If resistance is developing to multiple types of dewormers, you may also use copper oxide wire particle boluses or use “cocktail” strategies of giving multiple dewormers at once. You should discuss all specific treatment recommendations with your herd/flock veterinarian before giving any treatment to small ruminants.
https://www.wormx.info/part6
https://web.uri.edu/sheepngoat/files/McMaster-Test_Final3.pdf
https://content.ces.ncsu.edu/modified-mcmasters-fecal-egg-counting-technique
https://extension.psu.edu/parasite-management-fecal-egg-count-test-considerations-and-protocols