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.
Hatching. After 12 to 16 days, the eggs are ready to hatch, usually one each day in the order they were laid. Like most birds, the chicks use an egg tooth---a sharp hook at the end of the beak---to poke a hole in the shell. pair of robins will often nest two or three times in a season. Laying the Eggs. The female robin lays one small blue egg each day to a total of three to five eggs. She feeds on earthworms in the morning in order to ensure that her body has the energy to handle the physical demands of laying an egg.