Considerable weight has been put upon the ventilation question in incubators by manufacturers and operators, but it has been found that when the egg chamber is roomy, and the eggs are taken out and cooled twice each day, it is not of so much consequence. There is no doubt but that there must be some ventilation in the egg chamber, but from the experience and observation of the writer the value of the subject has been overestimated by many. Some machines have top ventilation, some bottom, and others both top and bottom, and there is seemingly no marked difference in the hatching.
When the ducklings are hatching, the broken egg shells should be removed once in every six or eight hours, so that they will not slip over the pipped eggs, as it would be sure death to the imprisoned ones. Occasionally a little bird is unable to free itself from the shell and needs help; the expert can readily detect when this is necessary. The one point to note in this connection is this: The egg just before hatching radiates a great deal of heat, while the duckling, when first out, being not unlike a little sponge, absorbs it, or in other words, the rapid evaporation which takes place generates cold; so that when the ducklings are out the machine should be gauged one degree higher.
When the ducklings are all out and dried off, the machine will run at least two degrees lower than when they were in the egg. Plenty of ventilation is needed in the machines while hatching. Keep the ducklings in the machine at least twenty-four hours after hatching, when they will be strong enough to be removed to the brooder. The heat in the brooder should be started twenty-four hours previous to use, so that it will be perfectly heated and ready for the ducklings when they are taken from the machine.
[GEESE.]
STANDARD BREEDS OF GEESE.
Introduction.—There are seven standard breeds of geese, as follows: Gray Toulouse, White Embden, Gray African, Brown Chinese, White Chinese, Gray Wild, and Colored Egyptian.
GRAY TOULOUSE GEESE.
History.—Gray Toulouse geese ([fig. 29]) are named for the city in France of that name, where they are extensively bred. In this country they are bred in large numbers by farmers and are fairly well thought of for market purposes. Their flesh is a trifle too coarse and flabby, when compared with some other geese, to be prized very highly for table purposes. They are termed a Christmas goose, as being later in maturing than the others they are just about right at the holiday time. They are fairly good layers, averaging about 40 eggs in a season.