As I live in the desert and cows around here are more likely to eat scorpions than grass, I will stick with Kerry Gold. 90% sounds decent enough to me. Even the author of the article admits that her 'extremely corn and soy sensitive daughter has been eating Kerrygold without visible issue.' As I am neither, I'll happily not let the perfect get in the way of the good.
“In God we trust; all others must bring data.” W. Edwards Deming
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So, yes, it was 100% grass fed.
My nutrition/fitness/critical thinking blog:
If a cow only ate hay all year round in a confined lot then saying it grass fed is technically correct too. For me grass fed is pastured on green grass - some hay supplementation may be required at times.
Since the toxins are said to be in the grain/seed (I guess little is in the stalk itself).
I think live stock would eat some straw too.
I guess also wild animals eat naturally dried grass at the end of the season so it may not be a big deal if green grass is the bulk of the food.