I know Luther Burbank developed a spinless Opuntia ficus indica X Opuntia ellisiana hybrid for cattle fodder at the start of the last century.
I know it has been imported in australia way back when & i think it would make a great dry season fodder.
The big question is, is it still here, is it still spinless or has it reverted? And if it is still around how can i get hold of a bit?