964 



EXPERIMENTAL FARMS 



5 GEORGE v., A. 1915 



FERTILITY AFTER BROODINESS. 



An investigation to ascertain if without mating again, fertility could be traced 

 in eggs laid after hen had been broody for any length of time. 



Table No. 7. — Fertility, if any, after setting and brooding for periods mentioned. 



Breed. 



Barred Plymouth Rocks . 

 Barred Plymouth Rocks. 



Buff Orpingtons 



White Rocks 



Broody . 



April 1 



9 



>, 20 



u 11 



First egg 



laid after setting 



and brooding. 



June 13 

 ., 15 

 M 13 

 „ 20 



No. 

 fertile . 





 

 

 



In all thirty-six eggs were set from four hens, but in no instance could the slight- 

 est trace of fertility be found. ~^ 



COOLING EXPERIMENT. 



One side of the Mammoth Incubator, eight trays, was used for a test in cooling 

 the eggs for longer and shorter periods while hatching. The room in which the experi- 

 ment was made had an average temperature for the three weeks of: First week 73-2°; 

 second week, 69.0° ; third week, 74.3°. The average relative humidity of the room 

 was: First week 63-3 per cent; second week, 61-8 per cent; third week, 71-0 per cent. 

 No moisture was supplied inside the machine. 



The eggs on several trays were cooled each day as follows, the time being in 

 minutes ; where " O " appears the eggs were taken out, turned and put right back into 

 the incubator without any cooling. 



Table No. 8. — Cooling Experiment. 



In addition to the cooling shown for tray No, 8, it was left out on the seventh 

 day for two hours in a temperature of 68°, on the fourteenth day for five hours in a 

 temperature of 69°, and on the nineteenth day for one hour in a temperature of 71°. 

 This was done to see what effect it would have if a tray was left out for several hours, 

 as is sometimes done by accident. 



Ottawa. 



