Following on from worms post.....

Marnie

Marnie

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I posted earlier this week about my friends horse with roundworm. She wormed her horse on Monday evening, and the mare is still passing worms (dead) tonight - quite a lot, around 15 worms, each around 7 or 8 cm long in each dropping.

The mare is really bright in herself and my friend is going to phone the vet tomorrow, but has anyone any ideas on how long she should keep passing the worms for? Her vet has identified the worms as Parascaris equorum (roundworm).

Hope no one is eating!! [image]
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i have known horses to pass worms for upto 48 hours after treatment, she should discuss with her vet a full and comprehensive worming programme, as she may have high burdens of other types of worms.
out of interest how old is the horse what is her past worming history and what was she wormed with??
 
Its really frustrating, the mare is 8, small cob mare. My friend has had her since she was 4. In that time, she has been wormed reguarly and strategically (i.e. tapeworm autumn and spring, for encysteds etc) on the advice of her vet. She also has worm counts done every 2 months or so to see if she needs to worm throughout the year other than tapeworm etc. In fact, she had an egg count done in mid-September - I am quite surprised that given the burden of worms that there no eggs present then. She has her own area of grass in a small livery yard that she poo picks daily. She was wormed with a double dose of strongid P as per my friends plan on Monday.

Its all a bit of a mystery - and worry, my friend is understandably very upset considering all that she does. She is also concerned about having to use the grazing again without resting it to allow any eggs to be destroyed - another question for the vet on how long!
 
has the grazing benn used previously for other horses?? i wouldn't be panicking yet - the fact the worms are dead proves the wormer has done its job!
does you friend use a weigh tape before dosing? there is resistance to pyrantel (the active ingredient in strongid p) which is becomming more common, this has been due to over use and misuse of this chemical.
another valid point would be to ask if the mare has been allowed to graze at a showground which has been heavily infested
as for the field at least 6 months rest is recommended, and some worm eggs can survive for upto 2 years on pasture,
if she was my i would follow the strongid up with equest pramox in 4 weeks time, this has a residual action within the body, and protection lasts for upto 13 weeks, the active ingredient is moxidectin, combined with praziquantal and it treats all worms including tapes and encysted small redwoms, but MAKE SURE THE MARE IS NOT PREGNANT BEFORE USING.
 
Thanks for the advice, much appreciated!

She does use a weightape before worming and she has been the only horse grazed in that area for 4 years - it is a small yard and they all have their own areas that they manage. The only thing that we could think is that she has been to a couple of shows and grazed for a short period of time - it didn't seem to be horse grazed grass.

The plan was to follow up with Pramox - I'm glad that you mentioned that! Interesting about the pyrantal, I wasn't aware of resistance to it, I was aware of resistance to Panacur and that group of drugs but not pyrantal.
 
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