Both the 'leaves' which are peeled and grated and are fried (I love it with eggs) and the fruit are edible, so they should be fine for goats. A little bit to try wouldn't hurt anything, make sure you take it out way before it gets moldy if they don't like it.

Funny story, I sold this Lamancha doe to a gal in New Mexico, I was heading the CA to visit family so I took her to them on the way out. She was my daughters goat and I was never very fond of her...she stepped out of the trailer, and while we were talking to the new owners she went over and put her nose in a cactus....welcome to New Mexico....she had to be put up on the milkstand and get the barbs removed from her nose Vicki

 

We had goats when I was a kid in Wyoming that ate it quite a bit, but they were used to it. Now what really gets me is how a goat can eat those awful puncture weeds. Roslyn is in hog heaven when Lindsey's chair comes through the barn yard. She runs up and cleans them all off her tires! OW! Tam

 

I grow spineless prickly pear (I know, an oxymoron). They thrive here and even coated with ice in the winter, they do not die. BUT the goats do a number on them. They will eat them down to the ground. I have to grow them in areas the goats can't get too. I had a beautiful spineless prickly pear over 10 years old that finally had begun blooming and was gorgeous and HUGE and the goats ate it.

They do not eat the spiney ones that grow natural here though. They will eat bark off of the trees first.