hay profile (was Dynamite supplement)

["JC Brown" <jcbrown@chorus.net>]

>    So, when choosing a supplement, it's a good idea to have
> a mineral profile done on your main source of hay, then go from
> there.

Where can you get a hay profile done and how much can
I expect to pay to have one done?

Also, I switch providers from time to time in search of good
quality hay - do I need a new profile done on each provider?

Joyce