Oct. 1, 1925 
Relation of Shape and Size of Eggs to Hatching Quality 693 
Table VII .—Mean weight of eggs whose embryos died in shell and that hatched 
per bird 
[Eggs laid by 24 Barred Plymouth Rock pullets] 
Died in shell 
Hatched 
Pullet No. 
Num¬ 
ber 
Mean 
weight 
Num¬ 
ber 
Mean 
weight 
Difference 
1.... 
20 
Grams 
55.28dr0.23 
32 
Grams 
54.69=b0.16 
0.59dr0.28 
2..... 
18 
54.64db .18 
32 
54.91dr . 12 
. 27 dr .22 
3... 
17 
54.26dh . 21 
42 i 54.50dr . 16 
.24dr .26 
4.-.-.. 
16 
54.28db . 20 
28 
54.32dr . 17 
. 04dr .26 
13 
55.25db . 13 
38 
55.32dr . 14 
. 09dr . 19 
6..... 
13 
55.37dr . 16 
33 
55.25dr . 12 
. 12dr'. 20 
12 
55.43=k .24 
34 
55.65dr . 14 
. 22dr . 28 
14 
54.44dr . 21 
27 
54. 31dr . 18 
. 13d: . 28 
9..... 
15 
58.43dr . 28 
26 
57.74dr . 13 
.69dr.31 
10.-.... 
18 
57.60dr .17 
31 
58.21dr . 14 
. 61dr . 22 
16 
54.45dr . 16 
28 
54.24dr . 16 
. 21dr . 23 
12...-. 
13 
56: 56dr . 18 
35 
56. 90dr . 11 
. 34dr .21 
13...... 
19 
56.65dr . 17 
22 
57.26dr . 21 
. 61dr .27 
19 
56.68=fc . 15 
37 
56.51dr . 10 
. 17 dr . 18 
22 
57.17± . 21 
28 
57.36dr . 11 
. 19dr . 24 
13 
55.23dr . 18 
22 
55. 10dr . 21 
. 13dr . 28 
18 
55. 52dr . 14 
30 
55.34dr . 14 
. 18=fc . 20 
18...-.-. 
18 
54.90dr .15 
29 
55.27dr . 16 
. 37 dr .22 
11 
54.88db .20 
19 
54. 41dr . 21 
. 47 dr .29 
18 
54.89db . 14 
37 
54.96dr .13 
. 07dr .19 
16 
55.33dr . 16 
28 
55.18dr . 12 
. 15dr . 20 
22 ___ 
14 
55.46dr . 18 
34 
55.32dr . 11 
. 14dr .21 
18 
54.34dr . 16 
37 
54.85dr .12 
. 51dr . 20 
28 
55. 10dr . 13 
30 
54. 66dr . 11 
.44dr .17 
The average number of fertile eggs per pullet was 47.42, with a 
range of from 30 to 59 eggs. The average number of eggs whose 
embryos died in shell was 16.44 per pullet, with a range of from 11 to 
28 eggs. The average number of eggs which hatched was 30.98 per 
pullet, with a range of from 19 to 42 eggs. ; 
The mean weight of fertile eggs per pullet varied from 54.30 grams 
to 57.95 grains, with a mean weight of 55.29 ±0.05 grams for all 
pullets. The mean weight of the eggs whose embryos died in shell 
varied from 54.26 grams to 58.43 gramsper pullet, with a mean weight 
of 55.38 ±0.08 grams for all pullets. The mean of the mean weights 
in grams of the eggs whose embryos died in shell was 55.50±0.61 per 
pullet. The mean weight of the eggs which hatched varied from 
54.24 grams to 58.21 grams per pullet, with a mean weight of 55.25 ± 
0.05. grams for all pullets. The mean of the mean weights of the 
eggs which hatched was 55.51 ±0.64 grams per pullet. Considering 
the means of the mean weights in grams per pullet of the eggs whose 
embryos died in shell and those which hatched, it is seen that 
there is very little difference,. 55.50 ±0.61 and 55.51 ±0.64. The 
difference in grams, with its probable error between these two means 
is 0.01 ±0.88, which, of course, is not significant. Also, the differ¬ 
ence in grams for all pullets between the mean weight of the eggs 
whose embryos died in shell, 55.38 ±0.08, and the mean weight of 
the eggs which hatched, 55.25 ±0.05, is 0.13 ±0.09, which is not 
significant. 
The mean weight in grams of the fertile eggs, and the per cent of 
fertile eggs which hatched per pullet, have been correlated for the 
group of 24 pullets. The correlation has been found to be 0.25 ± 0.13. 
There is a slight negative correlation, but it is not significant. 
71486—261 - 7 
