my 2 1 year old leghorns stopped laying . noticed about 3 weeks ago when i brought home 10 new birds . they havent layed a egg since . my egg production has been cut in half since the 10 new birds. plus there is feathers eveyehere some are molting noticed this about 2 weeks ago. 23 layers ages 1 year to 16 months old. getting about 8 eggs a day was getting a dozen or more a month ago. they have plenty of room to roam 300ft of fenced in pasture. layer mash and fresh water . i have 2 white leghorns 2 barred rockd 6 cinnamon queens 8 rhode island reds 4 rhode island /newhampshire cross 1 delaware .