22 
BULLETIN 1372, U. S. DEPARTMENT OE AGRICULTURE 
Table 10. — Correlation bet-ween daughters of each sire and their dams with respect 
to total yield of butterfat 
Number 
of 
daugh- 
ters with 
yearly 
records 
Average produc- 
tion of butterfat 
Standard deviation 
Correlation 
between 
Sire 
Daugh- 
ters 
Dams 
Daug 
hters 
Dams 
daughters 
and dams 
A 
5 
13 
12 
9 
6 
9 
7 
6 
6 
20 
6 
11 
6 
9 
6 
6 
11 
6 
7 
7 
7 
7 
16 
Pounds 
657.9 
745.3 
7S6. 6 
688.7 
783.9 
760.3 
795.9 
659. 4 
632.8 
735.3 
622.2 
623.6 
523.5 
607.2 
556.3 
532.2 
585.7 
432.3 
503.8 
634.5 
452.3 
508. 
621.2 
Pounds 
466. 9 
581.5 
647.9 
562.4 
663.5 
651.3 
697.2 
567.0 
541.8 
658.7 
54S.3 
578.8 
4Q2.9 
5S9. 7 
543.1 
525.8 
589.6 
442.7 
536.0 
6S5. 8 
510.5 
568.5 
693.5 
90.9 
131.9 
100.8 
95.6 
103. 1 
144.7 
161.9 
68.7 
170.3 
158.0 
107.4 
99.0 
47.0 
78.3 
136.7 
95.7 
95.8 
51.5 
61.0 
71.2 
30.2 
48.5 
89.4 
±19.3 
±17.4 
±13.9 
±15.2 
±20.1 
±23.0 
±29.2 
±13.4 
±33.2 
±16.8 
±20.9 
±14.2 
±9.2 
±12.1 
±23.6 
±18.6 
±13.8 
±10.0 
±11.0 
±12.8 
• ±5.5 
±8.7 
±10.7 
85.0 
80.6 
113.4 
128.9 
25.6 
92.6 
110.5 
78.5 
62.7 
217.7 
91.2 
86.1 
72.7 
148.7 
142.9 
66.9 
80.3 
63.1 
64.3 
35.5 
7S.0 
77.7 
61.6 
±18.1 
±10.7 
±15.6 
±20.5 
±5.0 
±14.7 
±19.9 
±15.3 
±12.2 
±23.2 
±17.8 
±12.4 
±14.2 
±23.6 
±27.8 
±13.0 
±11.5 
±12.3 
±11.6 
±6.4 
±14.1 
±14.0 
±7.3 
-0. 09±8. 30 
B 
-0. 23±0. 18 
+0. 17±0. 19 
u„_ 
+0. 60±0. 14 
E 
+0. 15±0. 27 
F 
+0. 71+0. 11 
G 
+0. 43±0. 21 
H._ 
+0. 48±0. 21 
I 
J "_- 
+0. 47±0. 22 
+0. 34±0. 13 
K__ 
+0. 67±0. 15 
L 
+0. 71±0. 10 
M 
-0. 22+0. 26 
N. 
—0. 39±0. 19 

+0. 51±0. 30 
P _ 
-f 0. 90±0. 05 
Q 
-0. 15±0. 20 
R 
+0. 66±0. 16 
S 
+0. 09±0. 25 
T . 
—0. 27±0. 24 
U 
-0. 23±0. 24 
V._ 
+0. 06±a 25 
Vf 
+0. 06±0. 16 
The number of tested daughters that these 23 sires have is rather 
small for the determination of a coefficient of correlation that is 
really indicative. A study of the coefficients of correlation between 
the daughters and their dams indicates that with the daughters of 
three sires there is a marked correlation. These three decided cor- 
relations are between the daughters and their dams of sire L ( + 0.71 
±0.10), sire F ( + 0.71 ±0.11), and sire P ( + 0.90 ±0.05). The last 
is the most significant of the three. In Table 2 it may be noted 
how closely both the milk and butterfat yields of the daughters of 
sire P follow those of the dam (from the highest daughter out of the 
highest dam down to the lowest daughter out of the lowest dam). 
The ranking of the records of the dams according to size of record 
does not follow that oi the daughters so closely with the other two 
sires, though the similarity of sequence is very apparent. 
The daughters of four other sires show evidence of correlation with 
their dams with respect to yield of butterfat, though the probable 
error is rather high. These four sires are: Sire D ( + 0.60 ±0.14); 
sire H ( + 0.48 ±0T21) ; sire K ( + 0.67 ±0.15); sire R ( + 0.66 ±0.16). 
A study of the records of the daughters of these bulls and their 
dams indicates somewhat the same general ranking of the dams' 
records with reference to size as that of the daughters; for instance, 
with 2 of the 4 sires the lowest-record daughter is out of the lowest- 
record dam, and with 3 of the 4 sires the highest-record daughter is 
out of the highest-record dam. 
