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.
Number of Eggs Laid: Average 2 per nest. The average for the west coast eagle populations is almost exactly 2 eggs per clutch. Eagles can lay only one egg but can also lay three eggs and there are some rare records of 4 eggs being laid. Incubation Period: 35 days.Most eagles only lay a single clutch of eggs. Each egg is laid about 3 days apart and incubation, the process of the eagles sitting on the egg to bring up the eggs' temperature, starts with the laying of the first egg. The eggs take almost precisely 35 days to hatch.ost eagles only lay a single clutch of eggs. Each egg is laid about 3 days apart and incubation, the process of the eagles sitting on the egg to bring up the eggs' temperature, starts with the laying of the first egg.