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B1, Yes ,I use Mt Olive diced jalepenos ,one jar per 10 #. This idea came from Boyko a renowned sausage maker! EDIT-I just realized you are inquiring about pickled and I'm talking about regular diced jalapenos. :)
Sure I do it all the time. In the past I have used fresh raw jalapeños, fresh roasted jalapeños and pickled jalapeños. My favorite by far is the pickled variety. I use about 1 oz chopped per pound of sausage.
Just be sure to drain them like Steve H said before adding to the meat.