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TECHNICAL BULLETIN 7 

 General Sujimary axd D?:DrcTioNS 



Tlie means for the broodies and non-hroodies for the three rates and for 

 winter and annual production for the eight-year period are as follows: — 



1. Birds carrying the liroody trait lay at a slightly higher rate when they 

 are laying than do non-broody birds. This ciiaracteristic is observable in lioth 

 December records and in winter records. 



2. A nuich more intimate correlation between iiie presence of l)ro()diness 

 and higli December intensity was observed in tiie 1916 flock than in the 1923 

 flock. This difference may probably he attril)uted to changes in sexu;il ma- 

 turity and to the time of onset and terniination of winter jiause. 



3. Intensity for the winter period is rather intimately correlated with the 

 presence of broodiness. Such a relationship is observed in the total pojuila- 

 tion for tlie eight years, in the 1916 flock and in tlie 1923 flock. 



4. Degree of iiroodiness is not correlated with either December rate or 

 winter rate. 



5. Tlie degree of correlation between broodiness and high annual rate is 

 constant Init negative and significant. 



6. Degree of broodiness may be measured with equal accuracy by number 

 of broody periods or liy total days broody during the jiullet year. 



7. "Winter rate and annual rjite are distinctly positively correlated. 



8. The duration of the broody period is somewhat lessened as the number 

 of periods increases. 



9. Correlation between the presence of broodiness and winter jiroduction 

 aliove the average is negligible when all the birds are considered over the 

 eight-year period. There is a significant positive correlation for the 1916 flock 

 and probal)ly a slight correlation within the 1923 flock. 



10. The mean winter egg record of broodies is not significantly greater 

 than that of non-liroodies. 



11. Annual egg production is significantly negatively correlated with 

 broodiness in the total population studied; to a very minor degree in the 1916 

 flock; and to a rather moderate degree in the 1923 flock. 



12. The elimination of broodiness has had but little significance in lireed- 

 ing for high winter production but a pronounced significance in breeding f'lr 

 hiiih annual records. 



