Thank you. I will be too busy next week to do much of anything about it, but after next weekend I'll be able to sort it out. What I want to accomplish is to keep my orchard producing grasses for my goats to eat, and this mixture of seeds are supposed to grow at different times, thereby providing a somewhat continuous cycle of sprouting. I wish I'd thought of you before I did this. [Stupid stupid stupid.]
I'll get in touch with you in about ten days and see if you can help further.
Truly........thank you.
Maybe not. Actually, I think you might have made a good choice for goats, as long as the fence has a buffer around it outside of which you could manage any escapees. It seems to me from here that if you plan for containing the forage you may be successful in providing higher production for your goats without causing a problem. I imagine you do have a fence because I would think that predation of your livestock would otherwise be a problem.
Most native grasses would probably be insufficiently productive for goats with the possible exception of California Brome (Bromus carinatus), which is a pretty good forage grass and a perrennial, thus it would not require reseeding every year (although it only lives four or five years depending upon how you treat it). The seed ain't cheap, but it's getting better. OTOH, although the seed you bought is probably cheaper, if your goat over-grazes it, you would have to reseed every year.
In any case, your success in managing forage for your animals would depend heavily upon how you manage the way they graze (eg rotational grazing). I don't know how much time you intend to spend doing that, but a lot can be accomplished relatively inexpensively with portable electric fencing.