﻿24 



BULLETIN 1372, U. S. DEPARTMEISTT OF AGEICULTUKE 



The sires in Table 1 1 , ranked according to the size of the apparent 

 correlation coefficients of their daughters with respect to butterfat 

 yields, are divided in Table 12 into the three following groups: 



(1) Eight sires in group, from sire P, coefficient of correlation 

 -{- 0.90 to sire H, coefficient of correlation -f 0.48. 



(2) Eight sires in group, from sire I, coefficient of correlation 

 + 0.47, to sire V, coefficient of correlation +0.06. 



(3) Seven sires in group, from sire A, coefficient of correlation 

 — 0.09, to sire N, coefficient of correlation —0.39. 



In each group, the sires are arranged in the order of their ranks as 

 found in Table 5, and with each sire is given the average increase or 

 decrease in pounds of butterfat. 



Table 12. — Sires divided into three groups according to correlation of daughters 

 and dams, showing increase or decrease in butterfat production of daughters (each 

 group in order of ranking) 



Group 1 



Group 2 



Group 3 



Sire 



Change 

 in butter- 

 fat pro- 

 duction 



Sire 



Change 

 in butter- 

 fat pro- 

 duction 



Sire 



Change 

 in butter- 



Letter 



Rant 



Letter 



Rank 



Letter 



Rank 



fat pro- 

 duction 



D 



4 

 6 



7 

 10 

 12 

 17 

 18 

 20 



Pounds 



+126. 3 



+109. 



+92.4 



+44.8 



+73.9 



+13.2 



+6.4 



-10.4 



E 



1 

 3 

 8 

 9 

 11 

 19 

 21 

 23 



Pounds 

 +120. 4 

 +13S. 7 

 +98.7 

 +91.0 

 +76.6 

 -72.3 

 -32.2 

 -60.5 



B 



2 



5 

 13 

 14 

 16 

 16 

 22 



Pounds 

 +163. 8 



F 



C-. 



A-- 



+191.0 



H 



G 



N 



Q 



+17.5 



L 



I 



J 



-3.9 



K 



T 



-51.3 



. 



W 



M 



+30.6 



p 



s 



U 



—58.2 



R 



V - . 













In Group 1, where the apparent correlation between daughters and 

 dams with respect to butterfat yield is most marked, and where it 

 might have been expected that the dams were exerting greater influ- 

 ence than the sires on the producing capacity of the daughters, the 

 sires are found to be fully as effective in increasing the producing 

 capacity of their daughters as are the sires in Group 2, where appar- 

 ently little correlation between the daughters and the dams exists, or 

 in Group 3, where the correlation between daughters and dams is 

 apparently negative. Indeed, some of the best and some of the 

 poorest sires are found in each group. 



In this study the fact that the records of the daughters of a sire do 

 or do not follow the relative size of the records of their respective dams 

 seems to indicate nothing as to the relative influence of the sire and 

 dams on the daughter's producing capacity. 



