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Wisconsin Dairy Herd Improvement Association, et al. / Wisconsin D.H.I.A. record
Vol. IV (1937)

Factors used in adjusting records,   pp. 5-7 PDF (527.1 KB)


Page 6


3. Factors for Adjusting Records For All Breeds to a Mature Cow
Basis. Based on a study of 4058 D.H.I.A. records, by J. F.
Kendrick, Bureau of Dairy Industry, U.S.D.A.
Age at
Freshening      Factor
Yr.    Mo.
2      0       1.29
2       1      1.28
2      2       126
2      3       1.25
2      4       1.24
2      5       1.22
2      6       121
2      7       1.20
2      8       1.19
2      9       1.18
2     10       1.17
2     11       1.16
3      0       1.15
3      1       1.14
3      2       1.14
3      3       1.13
3      4       1.12
Age at
Freshening Factor
Yr. Mo.
3      5      1.11
3      6      1.10
3      7      1.10
3      8      1.09
3      9      1.08
3     10      1.08
3     11      1.07
4      0      1.06
4      1      1.06
4      2      1.05
4      3      1.05
4      4      1.05
4      5      1.04
4      6      1.04
4      7      1.03
4      8      1.03
4      9      1.03
.Age at
Freshening    Factor
Yr.    Mo.
4     10      1.03
4     11      1.02
5      0      1.02
5      1      1.02
5      2      1.02
5      3      1.01
5      4      1.01
5      5      1.01
5      6      1.01
5      7      1.01
5      8      1.01
5      9      1.00
5     10      1.00
5     11      1.00
6 to  10 Yr. 1.00
11 to  12 Yr. 1.02
12 Yr. up      1.05
4. Factors for Adjusting Incomplete Records to a 305 Day Com-
plete Lactation Basis. Prepared by G. E. Dickerson, Depart-
ments of Genetics and Dairy Records, University of Wisconsin,
from a study of butterfat lactation curves taken from daily milk
weights and weekly butterfat tests for lactations of different
lengths on two milkings per day.
Incomplete        FACTORS
Lactation  Eqcted L    in If
Length in  Leis than 230.335 336dys
Weeks r Days 210 days days  or more
4      28     7.39    7.39    7.39
5      35    5.98     5.98    5.98
6      42    5.04     5.04    5.04
7      49    4.36     4.36    4.36
8      56    3.86     3.86    3.86
9      63    3.47     3.47    3.47
10     70     3.16    3.16    3.16
11     77     2.90    2.90     2.90
12     84     2.69    2.69    2.69
13     91     2.51    2.51    2.51
14     98     2.35    2.35    2.35
15     105    2.22    2.22    2.22
16     112    2.10    2.10    2.10
17     119    2.00    2.00     2.00
18     126    1.90    1.90     1.90
19     133    1.82    1.82     1.82
20     140     1.75    1.75    1.75
21     147     1.68    1.68    1.68
22     154     1.62    1.62    1.61
23     161     1.56    1.56    1.56
24     168     1.51    1.51    1.50
Incomplete        FACTORS
Tnutston   Expected Lactation
Length in  Less than 280-335 336Z*s
Weeks or Days 280 days days  or more
25     175     1.47    1.46    1.46
26     182     1.42    1.42    1.41
27     189     1.38    138     1.37
28     196     135     1.34    1.33
29     203     1.32    1.30    1.29
30     210     1.29    1.27    1.26
31     217     1.26    1.24    1.23
32     224     1.23    1.21    1.2D
33     231     1.21    1.18    1.17
34     238     1.18    1.16    1.14
35     245     1.16    1.14    1.12
36     252     1.15    1.12    1.10
37     259     1.13    1.10    1.08
38     266     1.12    LOS     1.06
39     273     1.11    1.06    1.04
40     280     1.10    1.04    1.02
41     287            i13      L.OD
42     294             1.02    .99
43     301             1.01     A8
44     308                      .96
45     315                      SS
46     32                       94
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