I've been weighing my 6 new chicks about every two weeks and recording their mass in google docs spreadsheet. They are currently 19 and 20 weeks old and last weighed on Fri July 6, 2012. All different breeds. All pullets, though I'm about 10% unsure on the marans due to an awful voice, huge feet, and fast growth.
I just made a chart with the data for those interested, for details and notes see the tab below the chart. 3 were hatched a week after the other 3, so I charted it by age not by date.
They have had great nutrition from the day we got them, including balanced un-medicated starter feed, a couple days of chick vitamin water each week for the first few weeks, and a serving of pro-biotic gel (nutrients and gut bacteria), chick grit, many earth worms, some insects, veggies berries, scratch grains, various seeds, grass, etc. (In other words, they're spoiled kids.)
And at least 15-30 minutes of direct sunlight(no glass) every day, for the first couple weeks, more as they got bigger and schedule permitting, free ranging a bit by 8 weeks.(the vitamin water also had vitamin D and K)
Edited by capsicum - 7/12/12 at 7:14pm