You can make bone broth with them, but you have to do a couple of things before tossing them in the pot. You will need to get them into reasonable size pieces to go into the oven, and then you'll need to roast the bones. With big bones, it can help to smash them up a bit before making them into broth, too, so the good stuff can cook out into the broth.
Obviously, you won't be able to do all 150 lbs at once, but you can freeze bones in plastic bags until you are ready to use them. I have a bunch of beef bones from the cow we bought waiting in the freezer for some cooler weather.