ARTIFICIAL INCUBATION
Correct incubator temperatures are much the same for turkey eggs as for chicken eggs, but the greater size of the turkey eggs may necessitate some adjustment of the apparatus used in measuring the temperature. This is true in nearly all kinds of incubators except those of the forced-draft type. The relative position of the thermometer in the egg chamber is important in the accuracy with which it records the temperature. For hatching turkey eggs the proper position of the thermometer is usually indicated in the directions that are furnished by the manufacturer of the incubator. As a general rule, with the bottom of the bulb 17/8 inches above the egg tray, the thermometer should read 100.5° F. for the first week, 101.5° the second, 102.5° the third, and 103° the last week. Forced-draft incubators are usually run at about 99.5°. Temperature can best be regulated, however, by using the thermometer that goes with the machine, placing it in the position recommended by the manufacturer, and then following the manufacturer's instructions for hatching turkey eggs, making sure that the egg trays do not sag.
Turkey eggs lose about 3.5 percent less moisture during incubation than do chicken eggs, notwithstanding the fact that turkey eggs require about 7 days longer to hatch. Excellent hatches have been obtained when the loss of moisture based on the weight of the eggs just before they were set, ranged within the following limits: After 6 days of incubation, 2 to 8 percent; after 12 days of incubation. 4.1 to 6 percent; after 18 days of incubation, 6.2 to 9 percent; and after 24 days of incubation, 9 to 12 percent.
On this basis, a dozen turkey eggs of normal size should lose about 1 ounce for every 6 days of incubation. The air cells of turkey eggs are smaller in proportion to the size of the eggs than are those of chicken eggs because normal evaporation in turkey eggs during incubation is considerably less than that in chicken eggs. When more moisture is needed in the incubator it can be provided by putting in water pans, or by placing burlap wicks in the pans. When less moisture is needed the water pans may be removed or the ventilation increased.
As a rule the eggs should be turned at least 3 and preferably 4 to 6 times daily. Four times daily, every 6 hours, day and night, is an excellent plan. They should be tested preferably on the eighth or ninth and again on the twentieth to twenty-second days, and all infertile eggs and those having dead germs should be removed. Cooling the eggs once or twice a day until they feel slightly cool to the face may be of value in small incubators. Turning and cooling should be discontinued about the twenty-third day, and the incubator door should be darkened and kept closed until hatching is completed. The poults may then be left in the incubators for about 24 hours or else put in the brooder and fed as soon as hatching is completed and the poults thoroughly dried off. Poults held in the incubator should be kept at about 95° F. and should have a rough surface such as 1/4-inch-mesh hardware cloth to stand on. Keeping the incubator dark helps to keep the poults quiet and tends to prevent spraddle legs. There is no good reason for withholding feed longer than 24 hours. If feed is withheld for a much longer period when the poults are in the brooder, they may eat the litter. Therefore, poults should be fed when they are put in the brooder house.
Shipping day-old poults in specially built strawboard boxes has been found to be satisfactory. The container is larger than that ordinarily used for baby chicks, 60 poults commonly being placed in each box.
[RAISING POULTS]
There are few turkey-raising problems so important as brooding and rearing the poults, because the greatest losses in turkey raising usually occur in the first few weeks of the birds' lives. Heavy mortality among the poults may indicate that the breeding stock used was low in vitality or was poorly managed, but it more often indicates poor feeding or management of the poults. The importance of keeping both the poults and the breeding turkeys on ground free from infection and away from chickens cannot be overemphasized. Improper brooding methods cause great losses, because turkey poults are very susceptible to cold, dampness, overcrowding, overheating, unsuitable feeds, and unsuitable litter, and they succumb readily to attacks of diseases and parasites.