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.
Does not build its own nest. Adult females lay an average of 2 eggs per clutch with a range of 1 to 4 eggs. The eggs are incubated for 30 days. The chicks start moving out of the nest at 5 weeks and learn to fly at 6 weeks of age. Spotted owl pairs do not typically nest every year, nor are nesting pairs successful every year.