68 PROGRESSIVE POULTRY CULTURE 



end for end and right for left. If the eggs are tested on 

 this day the regular turning may be omitted. Infertile 

 eggs and any eggs that, before the tester, show defective 

 development or weakness, should be removed from the 

 trays. 



For the second week the conditions of management 

 are but little changed. The increasing systems of blood- 

 vessels call for some increase in ventilation but the 

 supply of air need not be excessive. Keep the temper- 

 ature on the level of the tops of the eggs at about 102 

 and certainly below 103. If the air is dry keep the 

 water pans filled up to the twelfth day. 



On the fourteenth day examine the eggs before the 

 tester and throw out any that fail to show life or livli- 

 ness of the embryo. Omit the supplying of extra moist- 

 ure during the last week of incubation. Keep the tem- 

 perature at 103 on the level of the tops of the eggs until 

 the eggs begin to be pipped, when it may rise to 104 or 

 105 with good effect. If the air is dry, extra moisture 

 may be placed in the water pans or wet sponges may be 

 placed in the hatching chamber on the twentieth day. 



Give full ventilation to provide abundant pure air 

 to the eggs during the last seven days of the period of 

 incubation. The egg is now full of blood-vessels and 

 much oxygen is required in the rapid processes of growth 

 of the embryo. If the weather is warm or sultry it will 

 be advisable to turn the eggs twice daily during the last 

 week of incubation. The airing they thus receive helps 

 supply the much needed oxygen for the multitudinous 

 blood-vesels in the eggs. 



On the twentieth day, if the temperature has aver- 

 aged about right and other conditions have been kept 

 favorable, the eggs will yield to the peckings of their 

 inmates and allow the chicks to dry their downy cover- 

 ings and exercise their lungs in the free air. The chicks 

 drop from the trays into the nursery and may remain 

 there for one or two days before being removed to the 

 brooders. 



