TRANSMITTING ABILITY OP HOLSTEIN-FRIESIAN SIRES 
25 
Table 13. — Rank of 28 sires according to the average yield of butter fat of their 
daughters, and rank of same sires according to yield of milk of their daughters 
Average butterfat yield 
Sire 
Average milk yield 
Sire 
Daughters 
Dams 
Daughters 
Dams 
G - — 
Pounds 
795.9 
786.6 
783.9 
760.3 
745.-3 
735.3 
688.7 
659. 4 
657.9 
634.5 
632.8 
623.6 
622.2 
621.2 
607.2 
585.7 
556. 3 
532.2 
523.5 
508.0 
503.8 
452. 3 
432.3 
Pounds 
697.2 
647.9 
663.5 
651.3 
581.5 
658.7 
562.4 
567.0 
466.9 
685.8 
541.8 
578.8 
548.3 
693.5 
589.7 
589.6 
543.1 
525.8 
492.9 
■ 568.5 
536.0 
510.5 
442.7 
E 
Pounds 
23, 467. 4 
22, 074. 6 
21, 755. 4 
21,351.3 
21, 273. 8 
20, 137. 4 
20,* 34. 8 
19, 872. 9 
19, 575. 7 
19,128.4 
18, 542. 
18, 305. 6 
17, 855. 1 
17, 613. 6 
17, 418. 4 
16, 822. 9 
15, 676. 6 
15, 584. 6 
15, 454. 4 
14, 825. 2 
14, 175. 6 
14, 046. 7 
14, 009. 2 
Pounds 
20, 044. 4 
C 
C 
18, 670. 2 
E 
F.._. 
18, 854. 1 
F 
D 
17, 580. 9 
B 
B._ 
17, 138. 5 
J 
G 
19, 066. 
D__. 
J 
18, 912. 1 
H . 
H 
16, 957. 2 
A . 
A 
14, 464. 8 
T 
I 
15, 467. 7 
I 
T 
18,811.4 
L 
L 
15, 978. 
K 
W 
18, 880. 6 
W 
Q-.„ 
17, 249. 3 
N 
K 
16, 355. 7 
Q 
N. 
14, 907. 5 
8::::::::::::::: 
0_. . 
14, 783. 7 
p 
P 
16, 328. 7 
M 
v.... 
17, 564. 2 
V 
M 
14, 015. 8 
S_ 
R._- 
13, 991. 4 
XT 
XT 
14, 666. 
R__ 
S 
15, 117. 9 
The ranking of these sires in the order of average butterfat yield 
does not place them in the same order as when they are ranked 
according to the average milk yield. Table 13 shows that the better- 
producing daughters were on the average out of the better-producing 
dams. 
It will be noted that there is a gradual decline in average milk 
yield of the dams in somewhat the same order as that of the daugh- 
ters, though the decline is not uniform. The average production of 
butterfat of the daughters of the 10 sires at the head of the list is 
724 pounds, and the average production of their dams is 618 pounds. 
The average production of the daughters of the 10 sires at the bottom 
of the list is 532 pounds and the average production of their dams 
549 pounds. The same comparison holds with the milk yield, show- 
ing that on the average the sires at the head of the list were mated 
with better cows than the sires at the bottom of the list, and that 
the dams as well as the sires are contributing to the inheritance that 
determines the producing capacity of the daughters. 
The number of cases, however, in which sires raise or lower the 
production of the great majority of their daughters (see Table 2) 
regardless of the production of their dams, apparently indicates 
that if the sire is homozygous for the factors that govern high or 
low milk yield he is likely to have more influence on the production 
of a group of daughters than have the dams, because of the proba- 
bility of some or all the dams being heterozygous in their inheritance 
governing production capacity. 
Even in the case of the sire who improves approximately half 
his daughters and lowers the production of the other half, the pro- 
duction of neither the poorer nor the better daughters seems to 
follow very closely that of the dams. Take the case of sire N ; 5 of 
his 9 daughters are better than their dams and the other 4 are poorer. 
Here there is something of a negative correlation between the 
daughters and their dams with respect to production; that is, his 
