canola is the same family - its a brassica like Dwarf Essex Rape, and another form of rapeseed. Its a more cultivated crop, its grown for Canola Oil of course - but also used as a protein source in feed pellets, etc.
Here is a link
http://www.hort.purdue.edu/newcrop/afcm/canola.html
Most people planting for deer have mixed results - it is not very palatable most of the year.