PREDICTION OF MILK YIELDS 229
the rate of decline. It is possible mathematically to deduce this relation from the
equation to the lactation curve. It is convenient to reduce all yields to a standard
length, preferably 300 days which is the average lactation length. Table IX shows
TABLE IX.
Correction for length of lactation taking 300 days as standard.
|
Length of lacta- |
When rate of decline per month per 100 lb milk is |
|||
|
6.0 |
8.0(a) |
10.0(b) |
12.0(c) |
|
|
200 . . . |
1.368 |
1.339 |
1.300 |
1.269 |
|
210 . . . |
1.315 |
1.289 |
1.257 |
1.230 |
|
220 . . . |
1.268 |
1.246 |
1.217 |
1.194 |
|
230 . . . |
1.224 |
1.204 |
1.180 |
1.161 |
|
240 . . . |
1.184 |
1.168 |
1.148 |
1.132 |
|
250 . . . |
1.147 |
1.147 |
1.119 |
1.105 |
|
260 . . . |
1.113 |
1.103 |
1.091 |
1.081 |
|
270 . . . |
1.081 |
1.074 |
1.065 |
1.058 |
|
280 . . . |
1.052 |
1.047 |
1.042 |
1.037 |
|
290 . . . |
1.025 |
1.023 |
1.021 |
1.018 |
|
300 . . . |
1.000 |
1.000 |
1.000 |
1.000 |
|
310 . . . |
.9766 |
.9788 |
.9813 |
.9833 |
|
320 . . . |
.9480 |
.9590 |
.9642 |
.9681 |
|
330 . . . |
.9342 |
.9404 |
.9475 |
.9537 |
|
340 . . . |
.9145 |
.9230 |
.9324 |
.9401 |
|
350 . . . |
.8964 |
.9065 |
.9181 |
.9276 |
|
360 . . . |
.8792 |
.S913 |
.9048 |
.9158 |
|
370 . . . |
.8630 |
.8768 |
.8921 |
.9048 |
|
380 . . . |
.8478 |
.8632 |
.8804 |
.8943 |
|
390 . . . |
.8332 |
.8487 |
.8692 |
.8847 |
|
400 . . . |
.8194 |
.8370 |
.8584 |
.8762 |
|
(a) |
These figures are to be used for specially bred Indian cows. |
|
(b) |
„ „ „ „ cross-bred cows and buffaloes. |
|
(c) |
„ „ „ „ ordinary Indian cows. |
FOOTNOTE TO TABLE IX.
Example. The following example illustrates the use of the table. Administration Report on the