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.
How many eggs does a bluebird lay each year? On the surface, this might seem like an easy question. After all, participants in The Birdhouse Network send data to the Cornell Lab of Ornithology each year on the number of bluebird eggs that they count in their nest boxes. These data show that the answer depends on locationâEastern Bluebirds at northerly latitudes lay larger clutches than do bluebirds farther south.