14 
BULLETIN 1352, U. S. DEPARTMENT OF AGRICULTURE 
Table 16. — Comparison of average initial and retest records of Jerseys having 
initial records made at age of 4 years (class A and class A A records) 
Num 
ber 
of 
cows 
Average 
initial 
butterfat 
record 
made 
at 4 to 4H 
years old 
Average reentry records made at ages shown in 
these columns by same cows as initial records 
shown in column at left (pounds of butterfat) 
In- 
crease 
due to 
age 
Portion of re- 
entry record 
due to de- 
velopment 
Average 
due to 
o 
to 
o 
5 
U3 
to 
o 
to 
o 
5 
to 
o 
00 
o 
1 
CO 
o 
co 
o 
CO 
© 
CT> 
o 
o 
OS 
I 
o 
o 
o 
1 
o 
o 
§ 
CO 
o 
I 
develop- 
ment for 
this group 
66 
Pounds 
436 
453 
43& 
444 
470 
424 
477 
512 
454 
458 
419 
368 
389 
458 
488 
Pounds 
17 
30 
32 
32 
34 
31 
35 
37 
33 
33 
30 
14 
15 
18 
15 
19 
19 
19 
20 
18 
18 
16 
19 
21 
4 
3 
3 
Pounds 
35 
57 
34 
50 
70 
114 
88 
93 
68 
49 
63 
26 
185 
72 
49 
69 
41 
63 
-8 
74 
224 
125 
126 
-150 
-53 
93 
17 
P. ct. 
7.2 
10.6 
6.8 
9.5 
12.2 
20.0 
14.7 
14.5 
12.3 
9.1 
12.3 
6.4 
31.4 
13.1 
9.6 
12.2 
7.8 
12.2 
-1.5 
13.3 
31.7 
22.4 
20.0 
-36.9 
-10.9 
17.3 
3.7 
Per cent 
63 
540 
19 
502 
21 
526 
23 
574 
12 
569 
11 
600 
7 
642 
\ 10.3 
3 
555 
2 
540 
2 
512 
2 
408 
1 
589 
548 
""•*■ 
2 

513 
Made at 
4^to5 
years old 
39 
44& 
479 
468 
435 
519 
466 
464 
416 
485 
535 
537 
443 
437 
29 
567 
22 
528 
19 
515 
4 
531 
12 
558 
4 
706 
11.5 
9 
557 
5 
630 
1 
406 
1 
488 
2 
539 
457 
1 
