Join Date: Aug 2009
Location: secret mountain valley
Any time you start mucking with minerals, you risk the chance of overdosing. Some minerals can interfere with the absorption of others. If you think she has a deficiency, the best thing you can do is get her blood tested. Certain areas of the country lack some minerals or have excess of the ones that block absorption, so it is a good idea to get your hay tested as well, to make sure you don't need to suppliment.