Before anyone can recommend which wormer to use on your mare it is very important to establish what your worming program has been to-date. So my question would be, which wormers and what dates did you worm your mare over the last six months and when is your mare due?
Equimax is a safe choice as it is an ivermectin plus praziquantel based wormer that treats a broad spectrum of worm species including thread worm (Ivermectin) plus tape worm (praziquantel) - but it is important to bare in mind that equimax does not treat for encysted cyathatomes.
So basically if your mare has not received a treatment for encysted cyathatomes this year then its best to stick to treating her with Equest pre-foaling, followed by a wormer that treats for tape seperately from chemical group 4. (praziquantel)
Equest treats for all worm species including encysted cyathatomes and thread worm (excluding tape) see chart. The benifit also with Equest is that their is to date no known resistance to moxidectin.
Equest is listed as being safe to use in pregnant mares but not lactating mares, so personally that would be my preffered first choice pre foaling as you will not have the oppertunity to treat her with equest until the foal is weaned and whilst panacur gaurd is listed as treating for encysted worm it is not listed as treating for thread worm so would need to be followed by an ivermectin treatment. So basically your choice should be based on her foaling date and which treatments she has already received.
Equest recomend treating with their tape wormer one week later.
However if she received a tape worm treatment in the autumn /early winter/ then it will be fine to treat with equimax six weeks after your equest treatment with as opposed to a seperate tape worm treatment one week later.
Of course if she has already been treated with a wormer for tape this year their is no need to treat her with a wormer such as equimax and an alternative wormer from chemical group 1 (ivermectin based wormer) can be used - see list but check that they are safe to be used on pregant mares.
Worming efficiently is a maze, and many are confused by the "branding" of different wormers but once you establish that different brands fall into different chemical groups and treat different species of worms it becomes easier to establish an efficent worming program.
If in doubt speak with your vet or call wormersdirect and have a look at the intelligent worming program service they offer. It certainly takes out all the work from establishing a good worming program and combines worm count with chemical worming allowing you to sit back and wait for wormers and worm count kits to arrive in the post.
As always,having all animals that share grazing on a well managed worming program, good pasture management, including rotating paddocks, dung collection, harrowing in hot dry weather or cross grazing with sheep/cattle all contribute to recuding infestation.
Cleansing a pasture with sheep is ideal. She should now be clear for tape and most species of worms but my only concern would be that she has not been treated for encysted cyathatomes and other larval stages so would recomend a five day treatment of panacur in six weeks if she has been wormed already with the ivermectin gold? Or hold onto it and treat her with equest now.
I'd rather no treat for encysted worms whilst in foal as the treatment (although researched as safe) have quite an effect on the system.
She was paramox'd prior to being in foal, but of course that was over 12 months ago.
I'd really like to know whether the encysted treatments are all prophylatic or whether there is a problem. However you cannot worm count for it or blood test for it.
Worth noting all of ours are fat and happy on a hay diet!