20 BULLETIN 1372, IT. S. DEPARTMENT OF AGRICULTURE 
Table 9. — Method of breeding of each of 23 sires and records oj their dams 
Sire 
Record of his dam 
How this bull was 
bred 
How his sire was 
bred 
How his dam was 
Time 
Milk 
Butterfat 
bred 
E 
No record . 
7 days 
do 
Pounds 
Pounds 
Line bred (28.1 i).._. 
Outbred (18.75 i) 
Line bred (34.37 »).._ 
j-Line bred (34.371)... 
Outbred 
Line bred (25 i) 
Outbred 
Line bred (31.2 i). 
B 
567.9 
534.5 
545.1 
20, 174. 6 
539.1 
638.7 
520.1 
568.9 
707.6 
480.3 
535.4 
15, 972. 2 
25.04 
22.1 
22.1 
724.7 
19.5 
24.4 
* 20.2 
20.0 
24.6 
24.7 
28.4 
593.8 
Outbred. 
C 
Inbred (50 O.. 
Outbred 
Line bred (25 i). 
D 
L— do 
\l year 
7 days 
...do. 
Outbred. 
A . . 
Line bred (43.75 1)... 
Line bred (25 l ) 
Outbred 
Do. 
F 
Inbred (56.24 i) 
Outbred 
Inbred (50 i). 
H 
...do 
...do 
...do 
...do. 
?..do- 
\l year 
No record. 
7 days 
No record. 
7 days 
(7 days 
U year 
7 days 
...do 
...do. 
—do.. 
...do 
...do 
...do 
Outbred. 
G 
I 
do... 
"".do— ."—_"_""" 
j— do.. 
Outbred 
Line bred (26.31 i).._ 
Outbred. 
Do. 
Do. 
L 
J 
K 
do 
Outbred (18.75 
Outbred 
Do. 
Outbred (18.75 0. 
Outbred. 
N 
523.7 
16.7 
Line bred (28.12 i)~- 
Outbred 
do 
j-Linebred (31.25 — 
Inbred (65 i) 
Outbred 
.—.do— —""""I 
do.. 
do 
Line bred (21.87 i)._. 
Outbred 
Line bred (43.75 i). 
Outbred. 
T 
M 

P 
469.2 
478.0 
* 16,679. 
437.6 
533.6 
581.7 
558.5 
514.1 
437.1 
423.7 
14.4 
19.2 
J 522. 5 
15.87 
21.0 
22 
20.4 
2Q.3 
16.2 
19.42 
Do. 
Do. 
Line bred (25i). 
Outbred. 
w 
R 
S 
V 
u 
Inbred (62.49 i) 
Outbred 
Outbred (12.5 i) 
Outbred 
Line bred (31 1) 
"—do:—— !"""! 
— '.'.do'.'.'. """— — 
do 
Inbred (75 i). 
Outbred. 
Do. 
Do. 
Do. 
1 Per cent common blood. 
1 At 11 years 1 month 
On the basis of the dam's records one would hardly be able to 
select the best breeding sire from the first group of 10. These rec- 
ords, however, average higher than the records of the dams of the 10 
poorest sires. The records of the dams of the 10 poorest sires do not 
follow any more closely the ranking of the sire according to merit 
than is the case with the 10 best sires. 
It is hardly to be expected that the mere fact of an individual, his 
sire, or his dam, being line bred or inbred would cause him to be more 
prepotent than if he were outbred; that is, without any concentra- 
tion of blood lines. In order that the line breeding or inbreeding may 
have a favorable effect on prepotency it would seem necessary that 
the individual which appears more than once in the ancestry be an 
animal of superior breeding ability. It is a common belief, however, 
that the mere fact that a sire is outbred militates against the chances 
of his being prepotent. Three of the five sires heading the list in 
Tables 7 and 9 were line bred, the second and fifth each being out- 
bred. Fourteen of the 23 sires are classed as outbred. Six of the 
first 10 sires are in this class and 6 of the last 10 sires are also classed 
as outbred. 
The pedigree of any individual is only an indication of what the 
transmitting ability of that individual, for milk and butterfat pro- 
duction, may be. Until such time as we have pedigrees in which the 
sires have a sufficient number of tested daughters from tested dams, 
so that their breeding performance can be analyzed, as has been done 
with these 23 sires, predictions can not be made with much certainty 
as to the transmitting ability of any untried individual. When 
animals are produced with pedigrees in which all the sires for several 
generations have ability to transmit, such as sires E, B, and C dis- 
played, then it will be fairly certain that the majority of the bulls 
