low thyroid in mare

[yankee_minis]

I've got a mare that wouldn't catch last year so I had her thyroid checked. It is 1.11. So it's just a little low. (I think the regular is 1.4-1.5) She's on 1/4 tsp of the meds.

Is this low enough for her to keep from getting pregnant?

(vet also did a culture just in case)

 

[Minimor]

I've got a mare that wouldn't catch last year so I had her thyroid checked.  It is 1.11.  So it's just a little low.  (I think the regular is 1.4-1.5)  She's on 1/4 tsp of the meds. 
Is this low enough for her to keep from getting pregnant?

(vet also did a culture just in case)

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It might be low enough to keep her from catching in foal, but then again...

A research vet that I talked to at the WCVM Saskatoon last year said he's had mares that have tested at near 0 on their T4 levels, yet they have still carried and delivered perfectly healthy foals. So, he said, he doesn't put much stock in the T4 tests.