I finally got around to doing another weigh in of my JMF and CL breeder pens. Due to some culling and a couple losses to predators I have 11 hens and two roos left from each line, so 26 birds spread out between four pens. I also have a spare roo and hen in a hospital pen from the CL line. These girls are consistently laying an egg every day, nice large eggs 14-16 grams. I did weigh ins in the evening after all the hens had layed their eggs for the day. These breeders are all kept outside in pens that are covered but not heated and we have been having some pretty cold weather this year. All of these birds are 5-6 months old.
JMF hens range (280-361g) average: 313.9g 11.2 oz
JMF roo range (287-288g) average: 287.5g 10.2 oz
CL hen range (280-308g) average: 290g 10.3 oz
CL roo range (276-315g) average: 295g 10.5 oz
This means the birds only gained on average 10 grams from their nine week average to their six month average.