Richard: I bought 12 broilers , 7 weeks later some are almost 2kg and some are only 1kg, what would be causing this?
Charles: I am not familiar with metric but my guess would be: Males vs Females. Females average 2 weeks behind the males. Make sure your feeders and waterers are not overcrowded. Are there any visible signs of sickness?
Richard: No sickness, but by the looks of it the smaller ones are definitely females.