BUTTERFAT PRODUCTION OF CATTLE 
13 
Table 15. — Comparison of average initial and retest records of Jerseys having 
initial records made at age of 3 years (class A and class A A records) 
Num- 
Average 
initial 
butter- 
fat 
record 
made 
at 3 
to3^ 
years 
old 
Average reentry records made at ages shown in these col- 
umns by same cows as initial records shown in column 
at left (pounds of butterfat) 
In- 
crease 
due to 
age 
Portion of 
Aver- 
age 
due to 
ber 
of 
cows 
o 
o 
1 
o 
5© 
o 
us 
o 
CD 
c 
o 
o : So 
«, | o 
P- | oo 
o 
00 
OS 
c 
C5 
o 
o 
03 
o 
o 
o 
o 
o 
o 
o 
CO 
c 
reentry rec- 
ord due to 
development 
de- 
velop- 
ment 
for 
this 
group 
84 
Pounds 
421 
■IMS 
| 
Pounds 
37 
54 
55 
68 
71 
68 
78 
71 
72 
76 
75 
71 
69 
57 
57 
55 
31 
36 
47 
48 
51 
50 
43 
47 
47 
49 
50 
53 
35 
41 
41 
Pounds 
40 
20 
51 
30 
90 
67 
60 
59 
49 

101 
50 
33 
66 
61 
230 
60 
50 
41 
31 
- 53 
99 
91 
106 
162 
76 
198 
128 
73 
188 
109 
P.cl. 
8.0 
3.9 
9.7 
5.8 
15.5 
12.5 
10.0 
10.7 
8.9 
0.0 
16.3 
9.2 
6.4 
11.8 
11.0 
32.4 
11.7 
9.4 
7.9 
6.3 
9.6 
17.0 
17.9 
18.9 
26.2 
13.9 
29.2 
20.0 
13.3 
25.4 
16.4 
P.ct. 
68 
434 
508 
1 
56 
419 
525 
53 
420 
421 
401 
465 
420 
428 
453 
444 
421 
412 
437 
437 
424 
518 
--____-- 
30 
582 
29 
536 
i 
23 
603 
20 
550 
15 
549 
1 8.7 
7 
529 
3 
...L._ 
620 
5 
| , 
542 
8 
514 
4 
._.! .. 
560 
1 
555 
709 
2 
1 
514 
1 
61 
Made 
at3^ 
to 4 
years 
old 
423 
446 
57 
532 
1. 
33 
431 
416 
446 
432 
519 
41 
495 
16 
550 
14 
581 
' . 
11 
374 
407 
409 
422 
430 
460 
440 
512 
515 
508 
7 
560 
\ - 11. 5 
11 
618 
5. 
547 
3 
678 
2. 
641 
3 
^48 
1. 
74] 
665 
2. 
