The reason is this: the bird in its natural condition does not produce her eggs in our climate until April. She will lay twenty-five to thirty eggs, then show a desire to incubate, then will recuperate, and set a second time, perhaps giving a total of thirty-five or forty eggs. Now, we have completely reversed nature in this respect. By judicious feeding, good care, warm quarters, and careful breeding, we have induced the bird to produce her eggs in winter instead of summer, and, not only that, we compel her to lay three or four times as many of them; and when the poor bird shows a desire to incubate and recuperate her exhausted frame, we induce a change of mind, as soon as possible, and set her at it again.
As a natural consequence, as the warm season advances many of the birds are off duty, as it were, and the eggs not only decrease in numbers but in size as well, and during the extreme heat of summer, the later part of July and August especially, the eggs show a decided want of vitality. I never expect, at this season, to realize more than one duckling from two eggs. The same machine full of eggs that would give a hatch of 350 ducklings in the early spring, at this season will not give more than 175 to 200. The eggs appear to be as well fertilized during the first two or three days as in the early spring but evidently there is not vitality enough to carry them through, as the germs soon begin to die, and before the hatch is out you have taken nearly one-half of the eggs away as worthless. Nor is this all.
There is always a far greater mortality among the later hatched birds than in those got out earlier. They are more uneven in appearance, and never attain the size of those hatched earlier in the season,—convincing evidence that the old birds have transmitted their enfeebled, debilitated constitutions through the egg to the young ones. The natural laws of cause and effect are plainly represented here. I have tried repeatedly to overcome this difficulty by changing the feed and quarters of the old birds, dividing their numbers, but without effect. This shows the absolute necessity of selecting large, vigorous breeding stock. This principle applies equally to both land and water fowl.
The Absolute Necessity of Good Breeding Stock.
Debilitated, degenerate stock will not produce healthy and vigorous young. This is a prime cause of failure with many of our poultry breeders. They say that they cannot afford to breed from their early-hatched stock. They are worth too much in the market, so they are sent to the shambles, and their owners breed from the later-hatched, inferior birds. A few years practice of this kind soon degenerates the stock so that you will hardly recognize the original in it, and both birds and eggs are not only thus, but a very small per cent. of those eggs can be induced to hatch, and no amount of petting and coaxing can induce those that are hatched to live.
Every young breeder of poultry should inform himself of these facts before he starts in, for no living man can afford to breed from inferior stock. I passed through experiences of this kind many years ago, and always found that the laws of primogeniture cannot be lightly set aside. I invariably select the choicest of my early hatched birds for breeding stock, and no matter how high the price in market, I cannot afford to sell them. A gentleman, who is a large breeder, said to me the past spring: "How is it that your ducks are so much larger than mine? I bought stock from you four years ago, and have been breeding from it ever since, and now your birds are six or eight pounds per pair heavier than mine." "True, but you bought my latest-hatched birds, because they were cheap, and have been breeding from your latest-hatched birds ever since, while I have been breeding only from the choicest of my early birds. You have been steadily breeding your stock down, while I have been breeding mine up. There is now a wide gap between them."
Caring for the Ducklings when Hatched.
The little ducklings should be left in the machine for at least twenty-four hours longer. Be sure and open the air-valves and give them plenty of air, so that they may be well dried off. A uniform heat of 90 degrees should be held in the egg-chamber. The outer doors of the machine should be closed and the little fellows kept in darkness the first twelve hours. After that the outer doors should be let down. Then you will see some fun, for the little ducklings are far more active than chicks, and will begin to play at once. In the meantime the brooding-house should be prepared for the reception of the young brood. The heat should be started some twenty-four hours previous to use.
The brooding-house should be the same whether you are growing on a small scale or a large one, with simply the length proportioned to your needs. But always recollect that heat should radiate from above on your ducklings, as bottom heat will soon cripple them in the legs and render them helpless. In fact, I do not consider bottom heat as essential even for chicks. The most successful grower I know of, who grows 3,000 chicks each spring, getting them all out between January 1st and March 1st, and closes up the whole business by July 1st, uses top heat exclusively. He has experimented fairly with both, and says he wants no more bottom heat. If the breeder is growing on a small scale it will be economy for him to use brooders instead of a heater.
Figure 11 represents the best duck brooder I know of. As there is no patent on it anyone can make it who has the conveniences. This brooder is six and a half feet long by three feet wide, and will accommodate 150 ducklings. These brooders are of the most improved construction, are intended for both indoor and outdoor work, keeping the young ducks dry and warm in cold, stormy weather, even when located out of doors. The heat is generated in copper boilers, the water flowing through a galvanized iron tank, under which the young ducklings hover. This tank is five feet long, twelve inches wide, and about an inch thick, and is hung about eight inches from ends and back of brooder, leaving nearly eighteen inches in front the entire length of brooder, in which to feed the first day or two. The case of this brooder is made of matched boards and thoroughly ventilated and furnished with glass doors to admit light. This brooder should be used in the brooding-house during winter and early spring, after which it can be used to better advantage out of doors.