I don't know how often I should worm my cows, Once a year?
- Frequently Asked Questions -
Answer posted by Linda
Twice a year is best - spring & fall.
If you have liver flukes in your area, you need to worm with Ivomec Plus injectable or other wormer
effective against flukes, after a hard frost in late fall or early winter. The hard frost kills the snail that
carries the flukes.
Look through some of the university web sites. There are some excellent articles on worming.
Answer posted by Jeanne
We use Safeguard's "Strategic Deworming" program. In theory, you try to deworm before the cattle
load up the fields with eggs. We worm the cows in the late fall before the deadline for grub
treatment. (this date differs for different regions - we have to degrub before 11-1) We use Ivomec
in fall. In the spring, we worm the cows 8 weeks AFTER they go out on grass with Safeguard
drench. Theory being that it takes 8 weeks for the newly ingested eggs to make a complete cycle in
the cow, before she starts speading eggs on the fields thru her manure. Now the calves are different,
it takes 4 weeks for their egg cycle. We worm them 4 weeks after grass, then again at 8 weeks
when we worm the cows. We use this time to give 4-way vaccination shots to the calves since they
need to be given 4 weeks apart. (We give the cows 9-way in April prior to breeding.)