16 
BULLETIN 1352, TJ. S. DEPARTMENT OF AGRICULTURE 
Table 19. — Comparison of average initial and retest records of Jerseys having 
initial records made at ages of 7 and 8 years (class A and class A A records) 
Num- 
ber of 
cows 
Average initial 
butterfat record 
made at 7 to 7*4 
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 
Average 
due to 
develop- 
ob 
o 
oo 

00 
c 
2 
o 
OS 
2 
3 
b 
- 
pi 
b 
£0 
c 
^2 
o 
CO 
b 

- 
due to 
development 
ment 
for this 
group 
19 
Pounds 
488 
519 
559 
471 
434 
433 
394 
517 
Pounds 





-14 
-42 




-16 
-15 
-15 
-16 



-15 
-17 
-14 
-17 


-12 
-17 
-13 
-12 
Pounds 
29 
40 
-71 
21 
28 
154 
331 
112 
39 
-43 
114 
357 
150 
69 
57 
33 
53 
53 
34 
245 
-117 
- ? 6 
225 
33 
-2 
79 
P.d. 
5.6 
7.1 
-14.5 
4.3 
6.1 
26.9 
48.5 
19.3 
7.2 
15.1 
-9.4 
19.3 
43.1 
24.2 
12.4 
10.7 
5.9 
9.4 
10.6 
6.4 
37.0 
-29.5 
14.9 
-1.2 
37.8 
6.0 
-0.5 
17.3 
Per cent 
14 
559 
3 
4SS 
10 
492 
\ 6.3 
2 
462 
2 
573 
1 
683 
... 
5S0 
Made at 7V 2 to 8 
years old 
6 
468 
501 
433 
500 
493 
487 
485 
502 
10 
540 
1 
510 
1 
457 
1 
591 
1 13. S 
1 
S29 
2 
620 
1 
555 
534 
Made at 8 to V/ 2 
years old 
10 
477 
523 
512 
463 
518 
432 
531 
11 
556 
5 
565 
2 
501 
8.1 
3 
.535 
1 
6P.3 
1 
°>97 
504 
Made at 8H to 9 
years old 
6 
429 
491 
383 
531 
398 
389 
1 
485 
2 
596 
2 
547 
14.8 
1 
383 
1 
456 
