Yes, I agree with the general consensus here about Biels not being heat tolerant. We don't get really hot summers here, but when it is hot, they are the first to be panting.
Mine never laid the "torpedo" eggs; however, I've purchased some off
eBay from several different sellers, and theirs were torpedo style. One seller, sent me 6 eggs, and ALL six hatched! I couldn't believe it, but it be so.
I "Love" Bielefelder Roos. Have not had a mean one yet, and they are handsome. I've introduced new ones to a flock at various ages, and no blood shed.
I am so amazed to hear a Biel went broody as I've been raising them for several years now, and never had a broody hen.
On another note: My oldest hen who would lay 5-6 days/week seemed to stop laying. I noticed she had scale starting on her ankles, lost a lot of feathers, so I decided to give the ol' gal a foot bath/scrub and lube them up figuring she had mites. WELL, just before I got her feet in the tub, I noticed that infamous black "dot" that chicken owners dread seeing. I'm pretty gutsy, but never delved into surgery on my chickens feet.
Although I liked this ol' gal, I never named her, so that would have made it easier to find a home for her, and be done with the problem, let someone else deal with it.....but I didn't. Not sure why, but I didn't. Furthermore, she looked a MESS. Just picking her up caused a bunch of feathers to spew off of her and float all over the place like some sci-fi movie. She had tons of feathers missing, bare-ish bottom, scaly feet..... I was sure she would be on her death bed soon.
Call me crazy, but I took her to a vet. I explained her foot situation, the fact that she stopped laying, and asked about her feather situation or lack of.
Her took her in the back, and within just a couple of minutes, came back with her stating, "that black spot came right off."
I was embarrassed, because I thought he was saying it was dirt, and he washed it right off.
Well, what really happened is my hen whom I now call "Biely" (just b/c I had to give the vet a name upon her admission), she plucked that "kernel" out of her foot herself! The vet showed me the hole in the foot, said it looked good, and sent me on my way with an antibiotic (per my request-but vet said didn't NEED it.)
She started laying again about 1 week after she finished her antibiotic (6 day tx). Although we can't eat her eggs just yet, they are now a whopping 95g consistent double yokers! They are just SO huge, it's unbelievable! Also, she's finally starting to cover herself up a bit feather wise. I've never had a chicken molt anywhere NEAR that. Her feet look better.
On another note as far as hatching goes, I've been very successful. They seem to like the humidity in the mid 40's up until last couple of days. Then I raise it to high 50's. It's consistently worked well for me.