I love my brahmas. They're so nice compared to other breeds I've been around because they're docile. 1 question are these hatchery chicks? If so then they're bred for laying. I had some a couple years ago and still have 1 hen. The cockerels were jerks. My well bred rooster is a sweetheart. I have 14 heritage bred ones and 1 haychery bred. They they good medium sized brown eggs, will go broody if you let them, and are awesome mommas. I haven't had any problems with adding to the flock. Yes they are BIG chickens. They're slow to mature. My last hatching was September 1, 2016 and the cockerel still isn't up to size to process, and the pullets won't start laying until May/June time frame. Usually around 9 to 10 months of age. They love mud. They love compost heaps, they love making a mess of both lol. I've had this flock for over a year and still love them. They give me enough eggs to cook with, supply some of my family, and still raise a clutch or 2. I let 2 hens raise some last year and the youngest are still doing great. I did lose 1 to a hawk last year, but the rest are doing great. Don't put their roosts above knee level because once they get big it's harder for them to get up on them. Also after about 5 6 months they don't fly. They're just too big. I love mine. I walk out of the house and they come running to see if I have any goodies for them.
