Sephardic/Mizrahi Jewish Genetic Diseases. 1  Alpha-Thalassemia. 2  Ataxia Telangiectasia. 3  Beta-Thalassemia (B- 4 T) Corticosterone Methyloxidase Type II Deficiency.  Costeff Optic Atrophy (also known as Type III 3-methylglutaconic 1  Aciduria) Cystic Fibrosis.  Familial Mediterranean 1  Fever. Familial Tumoral Calcinosis.
They will lay best at 1 to 2 years of age. All pullets (female chicken under 1 year of age) lay small eggs at first and after a while will lay larger eggs. Younger hens will lay 1 egg every 3-4 days. A hen 30 weeks old can lay 2 eggs every 3 days.
These high production breeds are still probably laying four or five eggs per week--in other words, they lay more than many popular backyard breeds do, even at the peak of their laying. To read about how long hens lay eggs, please read the related topics below.ou can read more information on our blog about why keeping older hens in the flock can be a great idea--even economical! Not all chickens are so lucky, though! Factory farms slaughter meat birds at only six weeks old, while egg layers are slaughtered at only one or two years old.