Hi Erin,

The most accurate way (no pun intended!) is weigh out your minerals.  You can do it daily, which is how I do it.  Takes me less than 3 minutes to weigh minerals once/day for 2 feedings for 2 horses.  I bought this scale and really like it:  http://www.amazon.com/My-Weigh-440-Z-Digital-Pocket/dp/B004QDTPFI/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1401789318&sr=1-1&keywords=pocket+scale+440+z  But there are lots of other options available, some more and some less costly.  Check out our file on "Minerals--weights and measures pdf"  here:  https://groups.yahoo.com/neo/groups/EquineCushings/files/%203%20%20CORE%20DIET%2C%20ANALYSIS%2C%20NUTRITIONAL%20NEEDS/Vitamins%2C%20Minerals%20%26%20Ratios/  There are a couple of places to buy scales in that link too.

You can also make a week or a month's worth at a time.  We have a file on how to do that too.  https://groups.yahoo.com/neo/groups/EquineCushings/files/7a%20Hay%20and%20Diet%20Balancing/

Maggie, Chancey and Spiral in VA
March 2011
EC Primary Response
http://pets.groups.yahoo.com/group/ECHistory4/files/maggie%20in%20virginia/