Heres what the milogranite website says about it for deer replellent.

http://www.milorganite.com/home/faqs.cfm#12
Is it true that Milorganite will keep deer away? There is information published in the common press and on web sites that state that Milorganite is a deer repellent. Milorganite is not registered with the US EPA as a deer repellent and cannot be sold as one.