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 Blue Tit can lay a number of eggs ranging from five to sixteen eggs, in a single clutch (a clutch is how many eggs laid by one bird during one nesting period).he Blue Tit can lay a number of eggs ranging from five to sixteen eggs, in a single clutch (a clutch is how many eggs laid by one bird during one nesting period).