I wonder if seeds sold for feed/consumption are not necessarily viable for germination? Do feed stores sell seeds for growing a pasture? Is that what you got?
You could try a germination test -- soak overnight then either sandwich between moist paper towels and roll up into a tube in a plastic bag or wrap in plastic wrap (check at least once a day, twice -- morning and night would be better), or put in a jar and rinse twice a day like you are growing sprouts. (rubber band some kind of netting across the mouth of the jar, add water, pour out, then repeat. do this in the morning and at night). They should start germinating.
ideally, you would have a second batch that you know would germinate for comparison. For large volume of rye seeds, I would look for them in covercrop section.
I tend to buy covercrop seeds on line. Only local place I have seen them sold as such is at a grower's co-op. Not at garden centers/nurseries around here, and definitely not at big box stores. ...I wonder if tractor supply or agway sell pasture seeds? Haven't seen them on display, but you have to ask for a lot of stuff there....
I suppose rye could be in a lawn grass mix, but I don't know if that would be the right kind for feeding goats?