. Commercial poultry raising; a thoroughly practical and complete reference work for the amateur, fancier or general farmer, especially adapted to the commercial poultryman. Poultry. 268 COMMERCIAL POULTRY RAISING Testing Eggs.—It is customary to test hatching eggs twice, the first time on or about the seventh day, for fertility, in which the clear eggs are removed; and the second time at the end of the second week, though some operators, if they make their first test on the seventh day, which is pretty sure to remove'most of the dead germs, prefer to make the last test on the evening of the e
. Commercial poultry raising; a thoroughly practical and complete reference work for the amateur, fancier or general farmer, especially adapted to the commercial poultryman. Poultry. 268 COMMERCIAL POULTRY RAISING Testing Eggs.—It is customary to test hatching eggs twice, the first time on or about the seventh day, for fertility, in which the clear eggs are removed; and the second time at the end of the second week, though some operators, if they make their first test on the seventh day, which is pretty sure to remove'most of the dead germs, prefer to make the last test on the evening of the eighteenth day, when the eggs are turned and cooled for the last time, and the machine is to be closed until the hatch is completed. The shells of white eggs are so translu- cent that they can be tested on the third day, which is a big convenience. The shells of brown are so dense and thick that it is difficult to see the contents with any de- gree of accuracy until the seventh day. The process of test- ing eggs is simple enough after a little experience is acquired. It consists mainly in holding the egg between the eye and a strong light, which illu- minates the interior of the egg. In fact, it is precisely the same as candling eggs. See Fig. 169. Egg Testers.—There are many types of egg testers on the market, and the manufacturers of incubators usually furnish one with each machine. The simplest device is a tube or chim- ney of tin to fit over an oil lamp, and on one side of the tube there is a small opening, against which the egg is held for an examina- tion. See Fig. 170. Eggs may also be tested by sunlight, using. Fig. 170. -Simple egg candling outfit—ordinary lamp and cardboard Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roberts, Howard Armstrong, 1885-. Philadelphia, D. McKay
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