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 Rock Chickens. Barred Rock chickens are actually a nickname for the. barred variety of Plymouth Rock Chickens. They are named for their. barred (striped) black and white feathers. Whether you call them barred or plymouth, they are a good bet for your backyard flock. This dual-purpose bird is a good layer.