3 ms·
We give it to our horses every year, and it still kills intestinal worms. Some genetic changes are just so large that they are extremely unlikely.
by jessaustin 7y ago
We give it to our horses every year, and it still kills intestinal worms. Some genetic changes are just so large that they are extremely unlikely.
- projektfu 7y agoThere is quite a lot of acquired resistance to ivermectin in horse strongyles. Just not in S. vulgaris that was causing infarction. Now, the recommendations for horses are changing to a quantitatively driven approach based on fecal egg count rather than routine annual deworming. Pasture rotation is also useful. In sheep, the barber-pole worm Haemonchus has become resistant to most approved parasiticides. Resistance is a definite problem.