200 
Journal of Agricultural Research 
Vol. XXIX, No. 4 
Table VII. —Frequency distribution and mean weights of eggs producing male and 
female chicks, respectively, that hatched 
RHODE ISLAND RED FEMALES MATED TO RHODE ISLAND RED MALES 
Egg weight 
Eggs producing- 
Males 
Females 
Total 
Grama 
46.00 to 46.99 ..... 
1 
1 
47.00 to 47.99. .....- 
0 
a 
48.00 to 48.99 ...... 
0 
0 
49.00 to 49.99_.______ 
1 
1 
2 
50.00 to 50.99_____..... 
3 
0 
8 
51.00 to 51.99.......... 
4 
2 
6 
52.00 to 52.99.____...... 
1 
5 
6 
53.00 to 53.99____ 
8 
4 
12 
54.00 to 54.99...... 
10 
9 
19 
55.00 to 55.99______...— 
14 
13 
27 
56.00 to 56.99....... 
6 
8 
14 
57.00 to 57.99......___. 
9 
6 
15 
58.00 to 58.99.....— _ 
8 
10 
18 
59.00 to 59.99_______ 
13 
10 
28 
60.00 to 60.99.......____ 
13 
8 
21 
61.00 to 61.99.....—__ 
7 
5 
12 
62.00 to 62.99__.____... 
11 
7 
18 
63.00 to 63.99.________.... 
2 
7 
9 
64.00 to 64.99........ 
5 
2 
7 
65.00 to 65.99...... 
3 
2 
5 
66.00 to 66.99..... 
1 
0 
1 
67.00 to 67.99..... 
3 
0 
8 
68.00 to 68.99...... 
0 
0 
0 
69.00 to 69.99_____ 
1 
0 
1 
70.00 to 70.99.... ____.... 
1 
2 
3 
Total.. ..... 
124 
102 
226 
Mean weight______ 
58.06±0.26 
57.29±0.27 
57.75±0.19' 
Standard deviation.......... 
4.28±0.18 
4.11±0.19 
4.21 ±0.13 
Coefficient of variability.... 
7.37±0.31 
7.17±0.33 
7.29±0.23 
Table VIII.— Mean lengths, mean length-breadth indexes, and mean weights of 
eggs producing males and females, respectively 
Item 
Eggs producing— 
Difference 
Males 
Females 
Mean length.....mm.. 
Mean length-breadth index..____ 
55.31±0.06 
75.17±0.09 
58.64±0.19 
57.56±0.44 
58.49±0.17 
58.06±0.26 
58.24±0.14 
55.42±0.07 
75.09±0.10 
58.53 ±0.21 
57.82±0.43 
58.45±0.19 
57.29 ±0.27 
58.01 ±0.16 
0.11±0.09 
0.08±0.13 
0.11±0.28 
0.26±0.61 
0.04 ±0.25 
0.77±0.37 
0.23±0.21 
Mean weight Rock X Red, hatched____gm... 
Mean weight Rock X Red, died in shell..do_ 
Mean weight Rock X Red, total..do_ 
Mean weight Red X Red, hatched..do_ 
Mean weight, all eggs...do_ 
Of the 418 eggs from the Barred 
Plymouth Rock females, 347 hatched 
and 71 died in shell at hatching time. 
Distinguishing the sex of the chicks at 
hatching time was readily done, since 
the sex-linked barring pattern of the 
female parents is transmitted to the 
sons only. The male chicks, therefore, 
had the characteristic white spot on 
the back of the head and yellow shanks. 
The female chicks were solid black in 
down color and had very dark-colored 
or black shanks. Table V shows for 
the 347 chicks that hatched, the fre¬ 
quency distribution and the mean 
weights of the eggs producing males and 
females, respectively. The mean 
weight of the 190 eggs that produced 
males is 58.64±0.19 gm. and the mean 
weight of the 157 eggs that produced 
females is 58.53 ±0.21 gm. The differ¬ 
ence in mean weight, with its probable 
error, is 0.11 ±0.28 and, therefore, is of 
no significance. There is very little 
difference in respect to the amount of 
variability, either relatively or abso¬ 
lutely, in the groups of eggs producing 
the two sexes. The same situation 
prevails in respect to the 71 eggs whose 
chicks died in shell at hatching time, 
