364 
Journal of Agricultural Research 
Vol. VII, No. 8 
number of mares in any given class whose sires were under 11 years to 
the total number of mares in that class. It would seem from the curve 
that a decided negative correlation existed, but one must remember 
that rapid rise in the right-hand part of the curve (20 cm. and above) 
is based upon 669 cases, whereas the left-hand portion is based upon 
2,281 cases. 
To get sufficiently large numbers and as homogeneous material as pos¬ 
sible, the author has taken out for investigation daughters of five Govern¬ 
ment and five association stallions, each of which has more than 25 reg¬ 
istered daughters, of which at least 10 are sired before or after the stallion 
was 10 years old (Table II). The following observations may be made 
from the table in regard to the average size of cannon bone for the 
daughters of these stallions. 
Tabl 3 II .—Average size (in centimeters) of cannon bone in the daughters of 10 selected 
males , grouped according to the age of the males 
Name of sire. 
Age of sire. 
Total 
number 
of 
Number of daughters having a cannon bone of a given 
size (cm.). 
daugh¬ 
ters. 
18 
18. S 
19 
19-5 
20 
20. 5 
21 
Average. 
Difference. 
Digreaaa.... 
Bamsen 254.. 
Bolen 260.... 
Sverre 270... 
Sindre 297... 
B jame 301 
Galde 372.... 
Kongen 3 76.. 
Gimle 425.,,. 
Dalegud- 
brand 466.. 
fio years and younger.... 
\Older than 10 years. 
/10 years and younger.... 
\Older than 10 years. 
f 10 years and younger.... 
VOlder than 10 years. 
fio years and younger.... 
1 Older than 10 years. 
fio years and younger.... 
lOlder than 10 years. 
ho years and younger.... 
\Older than 10 years. 
ho years and younger.... 
\ Older than 10 years. 
ho years and younger.... 
\ Older than 10 years. 
ho years and younger.... 
\ Older than 10 years. 
fio years and younger.... 
\Older than 10 years. 
13 
2 S 
13 
22 
11 
i& 
to- 
36 
36 
31 
16 
29 
60 
37 
25 
13 
69 
38 
47 
13 
0 
3 
0 
2 
z 
2 
0 
1 
3 
4 
0 
2 
3 
1 
5 
0 
2 
2 
3 
0 
1 
3 
O 
3 
2 
5 
0 
7 
2 
4 
3 
6 
4 
1 
2 
0 
5 
5 
3 
0 
7 
13 
7 
10 
1 
5 
7 
IS 
13 
8 
4 
14 
19 
11 
8 
8 
20 
6 
14 
6 
2 
2 
0 
4 
2 
4 
0 
5 
8 
8 
1 
4 
9 
10 
3 
2 
19 
12 
XI 
5 
2 
3 
6 
2 
5 
2 
3 
6 
9 
5 
6 
3 
20 
14 
5 
2 
17 
10 
5 
2 
1: 
0 
0; 
1 
0 
0 
0 
2 
1 
1 
1 
0 
3 
0 
2 
0 
3 
2 
5 
0 
0 
1 
0 
0 
0 
0 
0 
0 
0 
1 
1 
0 
2 
0 
0 
1 
3 
I 
6 
0 
19-33 ±0.099 
19.09 ±0.074 
19-52 ±0.085 
19- n ±0.082 
19-39 ±0.14 
19.00 ±0.092 
19-30 ±0.096 
19.24 ±0.058 
19-35 ±0.058 
19-24 ±0.07 
19-55 ±0.13 
19-03 ±0.068 
19.49 ±0.061 
19-52 ±0.057 
19-17 ±0.11 
19-38 ±0.11 
19-51 ±0.051 
19-51 ±0.074 
19- 57 ±0.086 
19-38 ±0.073 
J- 0. 24±o. ia 
| o.4i±o. ia 
j 0.39±0. 16 
| o.o6±o- 11 
| 0. n±o. 10 
| 0. 52±o. 15 
j— 0.03 ±0.083 
j— 0. 2I±0. 16 
I 0 . 90 ± 0.09 
I O. I 9 ±o. II 
Total.. 
f 10 years and younger.... 
(Older than 10 years. 
300 
262 
17 
17 
22. 
34 j 
100 
96 
55 
56 
78 
49 
16 
6 
12 
4 
l9-448 ±0.O26 
19- 232±o. 027 
J- 0.2i6±o.037 
Either the average for daughters sired when the stallion was 10 years 
old or younger, or the average when the stallion was older than 10 years, 
or the average in both these cases, is larger than the average for the 
breed. 
Table II shows that for offspring of 7 of the 10 stallions the average 
size of the cannon bone is larger when the sire was 10 years old or 
younger at the time of service. The difference is not so large that it is 
significant in every case considered singly. The offspring of two, Galde 
and Gimle, of the remaining three sires show practically the same 
average for the two classes. The third stallion, Kongen, has a larger 
average for the daughters that he sired when he w*as older than 10 years. 
With such small numbers as 25 and 13 this deviation of this result from 
