I have only fed about 150 bales with the net wrap left on, and to date I have had no problems. One of the people who recommended this to me, has been doing this for many years and he has 400 cows and he is one of the best cattlemen in these parts. He said he has never had any problems. I had the exact same feelings as many have expressed on here, but after having several cattlemen tell me that it worked well, I decided to give it a try. So far I have been very impressed with how there is virtually no waste and the net wrap is easy to pick up after the bale is gone. Feeding the net wrap bales, without removing the net wrap is being promoted by more and more people all the time around here. I just got my first net wrap baler this year and also have a twine wrap baler. To me, one of the main reasons to switch to the net wrap is that you can bale many more bales every day with the net wrap baler. We ran both balers in the same hayfield this summer, and had both balers ran non stop the first day. The net wrap baler baled 225 bales and the twine baler did 118, so almost twice as many as the twine baler. This was because of the time stopped to tie each bale.
I think I am going to have to start taking the net wrap off again, as I do not want to chance losing a cow who consumes some net wrap. I will wait to see how it is working for some others before I try it again. It is a very common practice around here, but if this is what others have experienced, then it deserves to be studied some more.