10 
BULLETIN 1352, U. S. DEPARTMENT OF AGRICULTURE 
Table 10. — Comparison of average initial and retest records of Guernseys having 
initial records made at age of 6 years (single-letter records) 
Number 
Average initial 
butterfat record 
made at 6 to 6% 
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 
1 
Portion of re- 
entry record 
Average 
due to de- 
veloDmenc 
of cows 
o 
OO 
q 
5 
go 
o 
X 
35 
o 
3c" 
oa 
c 
© 
o 
1 
© N 
c 
O 
c 
5 
c 
c 
\ 
5 
Pounds 
500 
7W 
Pounds 








-41 
-23 



Pounds 
223 
139 
-2 
134 
202 
132 
5 
90 
-12 
122 
54 
90 
Per cent 
30.8 
22.9' 
-0.5s 
19. l! 
29.8 
24.3 
1.0 
14. 5j 
-1.5 
21.71 
Per cent 
6 
468 : " 
607 
2 
419 
567 
475 
411 
500 
529 
845 
464 
417 
3 
701 
4 
677 
2 
543 
> 20.7 
1 
505 
3 
619 
79? 
563 
1 
1 
... 
510 
Made at & l A to 7 
years old 
I 
2 
456 
512 
499 
487 
470 
631 
470 
10. 6' 
15.0 
-1.0 
12.1! 
7.8 
7. 1 
30.2 
12 
602 
1 
494 
2 
617 
130 
40 
01 48 
— 23 1 193 
14.1 
2 
1 
..-. 
510 
... 
679 
1 
640' — 
Table 11. — Comparison of average initial and retest records of Guernseys having 
initial records made at ages of 7 and 8 years (single-letter records) 
Number of 
Average initial 
butterfat record 
made at 7 to 7H 
years old 
Average reentry records made 
at ages shown in these columns 
by same cows as initial re- 
cords shown in column at 
left (pounds of butterfat) 
In- 
crease 
due to 
age 
Portion of re- 
entry record 
due to 
development 
Average 
due to de- 
velopment 
00 
q 
X 
5> 
c 
OS 
c 

5 
oa 
S 
iH 
Q 
O 
c 
© 
3! 

CM 
q 
Si 
q 
cm 
M 
q 
CM 
q 
for this 
group 
3 
Pounds 
460 538 
459 — 
Pounds 

Pounds 
78 
Per cent 
14.5 
28.6 
16.5 
14.9 
343 
26.3 
13.3 
6.5 
0.5 
27.4 
0.6 
13.9 
29.0 
21.5 
10.9 
25.2 
23.2 
Per cent 
3 
643 
184 
0j 98 
-2l| 73 
-24! 241 
-19| 129 
2 
496 
438 
485 
380 
594 
1 
490 
21.6 
1 
70? 
490 
1 
664 
Made at iy 2 to 8 
years old 

88 
5 
576 
502 
371 
| 
1 
537 
0- 35 
01 2 
-18! 133 
1 
3 
81 
-26 208 
129 
61 
1 
373 
[ 12,6 
1 
371 
486 
) 
496 
Made at 8 to 8M 
years old 
1 
493 
501 
535 
) 
1 
582 
\ 14.5 
1 
717 
J 
600 
Made at %y 2 to 9 
years old 
2 
471 
501 
531 
572 
| 
4 
502 
2 
710 

-28 
179 
164 
} 17. 8 
1 
708 
] 
] 
