TRANSMITTING ABILITY OP HOLSTEIN-FEIESIAN SIRES 
27 
yield (see sires S and V), the increase in percentage of fat was very 
small. In the daughters of sire G, the sire showing the greatest 
average increase in percentage of fat, there was an average increase in 
milk, as was also the case with the daughters of sire N, the sire show- 
ing the greatest decrease in percentage of fat. These data show that 
the percentage of fat and the milk yield in Holstein-Friesian cattle 
are inherited independently, and that it is entirely possible for a 
sire to increase both the milk yield and the percentage of butterfat. 
Table 14. — Sires with daughters showing greatest percentage increase in milk 
yield and their percentage increase or decrease in butterfat test 
Sire 
Average 
increase (+) 
or decrease 
(— ) in milk 
yield o 
daughters 
compared 
with dams 
Average 
increase (+) 
or decrease 
(-)of 
daughters 
compared 
with dams 
in fat test 
Sire 
Average 
increase (+) 
or decrease 
(— ) in milk 
yield of 
daughters 
compared 
with dams 
Average 
increase (+) 
or decrease 
(-)of 
daughters 
compared 
with dams 
in fat test 
A. 
Per cent 
+35.3 
+24.1 
+23.7 
+21.4 
+18.2 
+17.2 
+17.1 
+15.4 
+14.6 
+12.8 
+6.5 
+6.0 
Per cent 
+4.02 
+3. 24 
-5.43 
+0.94 
+2.59 
-0.60 
+0.91 
+1.16 
-5.80 
-8.84 
+6.57 
-3.27 
J . 
Per cent 
+5.9 
+5.8 
+5.6 
+2.1 
+1.3 
-1.4 
-4. 2 
-4.6 
-5.4 
-7.3 
-12.0 
Per cent 
+5.46 
B— 
M 
+0.28 
I._ . . 
G 
+7.92 
D 
Q 
—2.63 
C— 
R 
—3.48 
H 
T 
—6.30 
E.._ 
U : 
—7.47 
F— 
P 
+5. 90 
L... 
W 
—5.18 
N 
s... 
+1.41 
+1.54 
K_. 
V... 

Table 15. — Distribution of daughters of each sire with respect to corresponding 
increases and decreases in both yield of milk and percentage of butterfat 
Number of daughters 
Sire 
Total 
Yield of 
milk in- 
creased; 
percent- 
age of 
butterfat 
increased 
or left 
un- 
changed 
Yield of 
milk in- 
creased-; 
percent- 
age of 
butterfat 
decreased 
Yield of 
milk de- 
creased; 
percent- 
age of 
butterfat 
increased 
or left 
un- 
changed 
Yield of 
milk de- 
creased; 
percent- 
age of 
butterfat 
also de- 
creased 
A 
5 
13 
12 
9 
6 
9 
7 
6 
6 
20 
6 
11 
6 
9 
6 
6 
11 
6 
7 
7 
7 
7 
16 
3 
8 
5 
4 
4 
3 
2 
1 

8 
4 
1 
1 
3 
1 

2 
1 

1 



1 
3 
5 
3 
2 
4 
1 
4 
4 
3 

8 
3 
2 
2 
1 
5 
2 
3 
3 
2 
1 
1 

2 
1 

2 
2 
1 
1 
8 
2 
1 
1 
2 
5 
2 
1 
3 

1 
5 
2 

B 
2 
C 

D 
1 
E 

F._ 

G 
2 
H 

I 
1 
J 
1 
K 

L 
1 
M 
1 
N 
3 
. .... 
1 
P 

Q — - *— 
R 
2 
2 
S... __ 
1 
T 
3 
U 
4 
V 
1 
W 
9 
Total 
198 
52 
67 
44 
35 
