Author Topic: Post-drench FEC test - lambs still have medium infection (Read 2275 times)

suziequeue · « **on:** August 28, 2014, 07:00:48 pm »

So we FECed our flock and wormed them with Rycoben three weeks ago as the results showed 350 strongyle, 50 nematodirus and 200 coccidial.

We then did a post-drench test on the ewes and lambs separately. The ewes are coming back with <50 in all types but the lambs have still come back with a medium infection of 350 strongyle eggs (nematodirus and coccidial eggs are <50).

Am I correct in assuming that I need to change to a 3-ML (clear) or 2-LV (yellow) preparation?

fsmnutter · « **Reply #1 on:** August 28, 2014, 10:34:16 pm »

I would discuss with your vet, who can look at your field management, the exact timing of fecs because they are very specific for a resistance test, your drench equipment and weight measurements/estimates to check its not a dose rate issue. Also, if lambs thriving and not scouring, it may not be necessary to worm.
Lots of factors there that will be worth checking with someone who has knowledge of the local conditions, worm resistance etc and can recommend either a different wormer, or not.
Hope that helps

Melmarsh · « **Reply #2 on:** August 28, 2014, 10:50:12 pm »

It's also worth checking weights !! Were they wormed to the heaviest ewe and lamb ?? If they were under drenched then you will still have residual counts.

suziequeue · « **Reply #3 on:** August 28, 2014, 10:55:31 pm »

Whole flock weighed and divided into two weight groups drenched to the heaviest weight in each group. Drenching gun calibrated prior to using. Moved to fresh pasture 48hrs after drench.

Will be down to vet tomorrow to discuss what to do next.

So frustrating.