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.
The female then uses her tail fin to sweep the gravel back over the eggs and then moves on to construct another redd. The total number of eggs a female lays depends on her size, larger females laying more eggs. A half pound female will usually lay about 400-600 eggs.