I'll answer - only because it seems no-one else will -



I Don't feed deer supplementally, but - if you do - Cereal Grains won't hurt anything - but its not likely a preferred food. Horses like spring oats and Rye - Deer tend to eat on the shoots.

When feeding deer pellets, rye, oats, wheat - or even soybeans - in the end its conditioning the deer to eat the "abnormal food source" - so I dont think it would matter if its oats, wheat, Rye - or Tritacle. - If you can get them to eat it - It will provide some nutrition.

Sorry if its not the answer that helps you.

FH