PREDICTING EGG PRODUCTION IN WHITE LEGHORNS 309 



,hen the record of two or more months is taken into consideration, but the 

 nprovement due to an increase in the number of months upon which 

 rediction is based is not great. 



Prediction of the egg record which will be made by groups of birds sub- 

 jquently to the month or group of months chosen as a basis of prediction 

 !m also be made, but the accuracy of prediction decreases rapidly as the 

 sriod for which prediction is made becomes shorter. 

 The results show that in the case of a flock of White Leghorn fowl, which 



essentially identical in genetic composition and maintained under essen- 

 ally uniform conditions from year to year, it is quite possible to estimate 

 anual egg production from the record of either a single month or of two 

 r three consecutive months with a high degree of accuracy. The same 

 presumably true of other breeds as well. This point is now under 

 ivestigation. 



It is probably not feasible to use the equations given in this paper for 

 Dcks differing greatly in genetic composition or in conditions of mainte- 

 ance from that upon which these equations were based. The problem 

 : the determination of corrective terms by which the equations may be 

 pplied to flocks other than that upon which they are based is now under 

 tvestigation. 



LITERATURE CITED 



.^DER, B., and EGBERT, A. D., 1918 A quick method of obtaining individual egg records 

 without the trap nest. Bull. Utah Agric. Exp. Sta. 162. 



^AKESLEE, A. F., HARRIS, J. ARTHUR, WARNER, D. E., and KIRKPATRICK, W. F., 1917 Pig 

 mentation and other criteria for the selection of laying hens. Bull. Storrs Agric. Exp. 

 Sta. 92, pp. 95-194. 



\RD, L. E., 1917 A study of egg production in the White Leghorns. Bull. Storrs Agric. 

 Exp. Sta. 91, pp. 41-90. 



ARRIS, J. ARTHUR, BLAKESLEE, A. F., and WARNER, D. E., 1917 Body pigmentation and 

 egg production in the fowl. Proc. Nation. Acad. Sci. 3: 237-241. Fig. 1-3. 



ARRIS, J. ARTHUR, BLAKESLEE, A. F., and KIRKPATRICK, W. F., 1917 Interperiodic correla 

 tion in the egg production of the domestic fowl. Proc. Nation. Acad. Sci. 3: 565-569. 

 Fig. 1-2. 



ARRIS, J. ARTHUR. BLAKESLEE, A. F., and KIRKPATRICK, W. F., 1918 The correlation between 

 egg production during various periods of the year in the domestic fowl. Genetics 3: 

 27-72. Fig. 1-11. 



ARRIS, J. ARTHUR, BLAKESLEE, A. F., WARNER, D. E., and KIRKPATRICK, W. F., 1917 The 

 correlation between body pigmentation and egg production in the domestic fowl. 

 Genetics 2: 36-77. Fig. 1-16. 



ENETICS 6: My 1921 



