When examining the lung fields of a normal CXR, the outline (silhouette) of the heart borders; the ascending and descending aorta; the aortic knuckle and the hemidiaphragms should be clearly visible. 1  All of these silhouettes, or structures, are in contact with a specific portion of the lung.
Perhaps the most important parameter is temperature â chicken eggs should be incubated at a temperature between 99 and 102 degrees Fahrenheit (99.5 is often considered to be ideal) and 50 to 65 percent relative humidity (60 percent is often considered the ideal).uring the final three days of incubation, the eggs should ideally be located in a slightly cooler (98.5 degrees) and more humid (65 percent relative humidity or greater) environment to facilitate successful hatching.
Correct temperature and humidity levels. The correct temperature in this incubator for chicken eggs - whether large breed or bantam - is 37.5ÂºC (between 99Âº and 99.5ÂºF). The correct humidity level for this incubator between days 1 and 18 is 45%. At day 18 it is raised to 65% in preparation for hatching.