Are the excreted worms all dead after worming?

[FionaM12]

As title

I've never known the answer to this one. Mollie and her fieldmates are all being wormed today, then we'll do a big poo-pick tomorrow. We'll do the poo-pick anyway, but out of interest, are any live worms excreted to contaminate the field?

 

[Aarrghimpossiblepony]

As title

I've never known the answer to this one. Mollie and her fieldmates are all being wormed today, then we'll do a big poo-pick tomorrow. We'll do the poo-pick anyway, but out of interest, are any live worms excreted to contaminate the field?

I read that you should leave horses on the same pasture for two weeks after worming so that those with immunity(?) get messed up by mixing with those that don't.

 

[*hic*]

Yes there can be live worms excreted but for them to have been dislodged they will be pretty peaky and on their way to the great gut in the sky They can't survive outside the body for any length of time.

 

[FionaM12]

Thanks for that.

 

[lachlanandmarcus]

I read that you should leave horses on the same pasture for two weeks after worming so that those with immunity(?) get messed up by mixing with those that don't.

This is correct, and is the latest advice (its kind of opposite to the traditional advice about worming before moving to fresh fields, but it makes a lot more sense).

If you put the horses straight onto the new field then all the expelled live worms - which is quite possible to happen) will be ones resistant to the wormer. They will breed with each other and the offspring will also be resistant, result, a field with 100% resistant worms.

At the very minimum 48 hours in stables or on the old field will help to prevent this, 2 weeks would be ideal.