It's many types. There are larger seeds of some sort of oat, teeny seeds like from rye or radish and a few other types. The bag I'm currently using is called Hot Spot. There were several blends of deer plot seed at my TSC.
I feed it to the chickens, budgies and cockatiels. It does not last long at all. I tried growing it in troughs in front of my aviaries but found the chickens went and ate the oat seeds, then after everything sprouted they were eating it faster than I could grow. So I had to move my troughs and pots out of reach haha.
http://www.tractorsupply.com/tsc/pr...s-blend-4-lb-covers-11-000-sq-ft?cm_vc=IOPDP1
This is similar to what I'm using now. I did a bag of the oat mix before this one, it all gets eaten. My husband says watch out for that rape seed, it can get out of hand if the birds don't eat it. I don't have that problem.
If you look for "deer plot" at TSC you will see all sorts of seed.