I don't think it's a joke at all, as animal welfare is extremely important to me. Having said that, and having seen the show this afternoon, I took note of one actor gently interacting with the chicken pre-show. He may have given her some feed or perhaps was just calming her -- though she didn't seem bothered by the crowd, noise and lights. Then the goat arrived on stage, prompting me to try to ask an usher about both animals' care. She was quickly busy with other theatergoers, but indicated that they're well treated, adding, "The goat has become quite a performer. "
Indeed. About two minutes after that brief exchange, an actress leading the goat around the sand-covered stage suddenly squealed when the newly rambunctious goat jumped on her. The audience burst out laughing at what appeared to be a cute display of an animal's affection rather than agitation. Moments later, he jumped on the table that held plastic jugs of water and I guess a few other things --- I think he was starting to eat something that was decidedly not food and the cast was trying, with good humor, to get him to stop. I can't swear that's what he was doing -- it was across the stage from my seat -- but it wouldn't be out of character for a goat. When I was around 5 years old, I had a little plastic coin purse. A rabbit, I think. My mom took me to a petting zoo, where a goat proceeded to get ahold of the coin purse and, yes, eat it. I worry almost obsessively about animals and would like answers to the questions asked here. But I found the goat's behavior fairly natural and was happy to see him (?) and the chicken treated affectionately by the cast. I hope they're as well cared for off stage.