Definition of ophthalmology for English Language Learners. medical : the study of the structure, functions, and diseases of the eye.
Pullet: Six Weeks to One Year. Young female chickens less than 1 year old that have fully feathered out and are about the size of large pigeons are called pullets. Expect your barred rock pullet to start laying eggs when she is about 16 to 20 weeks old. Once she begins laying, she should produce one egg every 25 hours â except during the cold, dark hours of winter when she may not lay at all -- until her first molt a year later.
Barred Plymouth Rock chickens were the original variety and are said to have been developed using the bloodlines of the Braham, Black Java, the Black Cochin, the Dominique and the Pit Game fowl. These are large birds, with the roosters weighing in on average at 9 1/2 pounds and the hens at 7 1/2 pounds.