20 
BULLETIN 1352, U. S. DEPARTMENT OF AGRICULTURE 
will show improvement, not only for her own sake, but also to add 
prestige to the family of which she is a member. 
(3) The cow that failed to come up to expectations on her first 
test because of injury or some other known reason is retested in order 
to obtain a normal and better record. 
Tables 24 and 25 were prepared in order to determine whether the 
cows retested were better or poorer producers on the average than 
all tested cows. 
Table 24. — Average initial butt erf at records of all advanced-registry Guernsey 
cows and those of cows retested (classified according to age at time of initial test) 
Age 
Initial records 
of all cows 
Initial records 
of cows 
retested 
Nam- Butter- Num- 
ber fat ber 
Butter- 
fat 
Age 
Initial records 
of all cows 
Initial records 
of cows 
retested 
Num- 
ber 
Butter- 
fat 
Num- i Butter- 
ber j fat 
Under 2 rears. 
2 to 2 V 2 years. 
2Hto 3 years. 
3 to 3 1 2 years . 
■3H to 4 years . 
4 to 4 1 2 years . 
43-4 to 5 years . 
5 to b l o years . 
hVi to 6 years . 
6 to 632 years. 
& l /2 to 7 years. 
Pounds 
Pounds 
275 
368 
55 
381 
2,367 
404 
449 
427 
1,211 
424 
215 
441 
897 
433 
146 
443 
695 
453 
99 
463 
625 
470 
76 
473 
432 
473 
42 
494 
373 
495 
22 
506 
313 
489 
23 
504 
305 
482 
2S 
499 
214 
4S7 
21 
503 
7 to 7H years... 
7}-2 to 8 years... 
8 to 83^ years ... 
8}i to 9years... 
9 to 93 2 years ... 
9Uto 10 years.. 
10 to 103-2 years . 
11 to llHj-ears. 
12 to 12H years . 
13!4to 14 vears . 
179 
148 
135 
88 
102 
80 
45 
28 
13 
S 
Pounds 
495 
499 ! 
496 I 
495 I 
502 j 
496 
493 I 
459 i 
504 j 
494 
{Pounds 
465 
516 
510 
509 
538 
518 
392 
433 
410 
Table 25. — Average initial butterfat records of all register-of -merit Jersey cows 
and those of cows retested (classified according to age at time of initial test) 
Initial records 
of all cows 
Initial records 
of cows 
retested 
Initial records 
of all cows 
Initial records 
of cows 
retested 
Age 
Age 
Num- 
Butter- 
Num- 
Butter- 
Num- 
Butter- 
Num- 
Butter- 
ber 
fat 
ber 
fat 
ber 
fat 
ber 
fat 
Pounds 
Pounds 
Pounds 
Pounds 
Under 2 years — 
1,237 
343 
428 
352 | 
8 to 8H years 
267 
4S0 
33 
501 
2 to 2Y 2 vears 
3,633 
368 
1,194 
382 j 
832 to 9 years 
232 
462 
13 
437 
2^ to 3 years 
1,613 
386 
497 
403 i 
9 to 9 2 i years 
163 
468 
12 
456 
3 to 3*2 years 
1,398 
404 
408 
425 
9 : 2 to 10 years... 
128 
475 
6 
529 
ZV 2 to 4 vears 
1.011 
423 
267 
428 | 
10 to 10'-2 years .. 
114 
476 
12 
455 
4 to 4>4 years 
923 
440 
224 
448 
10 1 - to 11 vears. . 
68 
459 

526 
A\'2 to 5 vears 
705 
454 
148 
460 
11 to ll 1 2 years.. 
53 
454 
2 
395 
5 to 5H years 
673 
457 
122 
468 , 
II 1 -. to 12 vears. _ 
39 
478 
3 
417 
53^ to 6 years 
587 
469 
124 
478 ! 
12 to 12 J 2 years. . 
40 
445 
3 
463 
•6 to 6H years 
509 
475 
91 
498 1 
13 to 133-o vears.. 
18 
445 
3 
441 
63^to 7 years 
404 
471 
55 
497 | 
133 £to 14 years.. 
11 
475 
2 
483 
7 to 73-2 years 
395 
468 
51 
491 ! 
14 to 143-2 years .. 
6 
439 
3 
487 
73^ to 8 years 
310 
470 
23 
487 
Except in some of the older classes having only a small number of 
individuals, the animals retested had initial records above the average 
for all cows in the group of that age. This fact has no bearing on the 
information given in Tables o 1 - to 21, as allowance is made for this 
difference between the initial records of the animals under considera- 
tion and the average of all initial records, and the difference is carried 
into the factor representing the increase due to age. The factor of 
development is not affected. 
