Question for all of you BO owners: I have two 19 week old pullets (one of whom laid her first egg yesterday) and my girls seem small compared to my barred rocks when they were the same age...I was under the impression BOs are a large, heavy breed; do they put on the bulk of their size after they start laying? Also, I've had my girls since they were just a few days old and handled them/spent time around them regularly as they grew, but my two could not be more skittish around my husband and I...again, I was under the impression BOs are personable and docile, but that has definitely not been the case with ours...I know each bird's personality/temperament will vary, but they panic and scramble over just about everything...could this be a behavior that mellows out as they age? I thought maybe they might take a cue from our older barred rocks who are very friendly and calm around us and in general, but so far that's not the case. Thanks for any insight!
It is my understanding that Buff Orpingtons, and most chickens, are not fully grown until they are about a year old - even though they start laying eggs at about 20 weeks. Usually those first eggs are smaller and sporadic but soon they hit a good rhythm and start cranking out regular sized ones with regularity.
Now about the BO's not being the same size at the same age as the BR's - This may sound like a dumb question but I still come across chicken owners that do not know this but - did you feed them 21% protein feed during at least the first 10 weeks of their life?
I fed mine 22% protein mixed feed and they still ate up bugs like they were starving, just to get even more protein. They still love the games we play with bugs. - EX. Have you ever tied a string to a june-bug's leg and watched him fly around in circles? Now imagine doing that and having 7-8 buff orpington chicks of about 3 weeks of age following it around everywhere in that circle. Some got smart enough to stop and let the bug fly by again before taking a leap for it. LOL cheap entertainment. But I digress.
Anyway, you mentioned the birds being skittish? Mine all have different personalities. Some are skittish and some are not. Almost all of them offer some verbal protest when I go to pick them up. ALSO VERY Important - the birds might develop a skittish attitude based on their ranking in the "pecking order". This might be key for you since, if I am figuring this correct from your post, you seem to have introduced the young BO's into an established s flock of adult birds of other breeds. In my case the BO's came first and the rule the roost - there are more of them and... well.. they were first.
Just my two cents.