"Does buckwheat leave a seed that is good forage for birds. I am especially interested in game birds like dove, quail and turkey."
yes it does lazyshooter. even if you don't disc, it reseed's itself for the next season, disking the same season will get you, in my region 2 blooms!
the bees do very well on buckwheat. buckwheat honey? i like buckwheat honey and have a number of customers ask for it!