Try using canned pumpkin (the kind used for making pumpkin pie). My guys love it and even with medicine in it they lick the syringe when I am finished.
Lee ".......and God sought to bestow upon man a supreme mark of his blessing. God created the horse. The horse could run faster than the deer, jump higher than the goat, and endure longer than the wolf. Man, being encompassed by elements that sought to destroy him, would have been a slave, had the horse not made him king."