5-12 Operating Instructions
D-H021.1011EN
innovators in agriculture
The total milk yield in 24 h is calculated with the formula:
• Total milk yield × 1440 : time
• Total milk yield: total yield of all milkings during the sampling
run, denoted in kg or lb
• 1440: 24 h in minutes, this is a fixed number
• Time: time period from last milking prior to the sampling run
to the last milking in the sampling run, denoted in minutes
To make a correct calculation, make sure:
• The last milking of the cow is successful prior to the sampling run
• The last milking of the cow is successful during the sampling run.
Milking(s) in between this period do not have to be successful.
Example
The last milking prior to the sampling run is done at 18:33 h. During the
sampling run, the cow is milked at 0:46 h with a yield of 5.5 kg (12.1 lb)
and at 12:47 h with a yield of 12.5 kg (27.5 lb).
The total milk yield during this sampling run is 18 kg (39.7 lb). The time
period from the last milking prior to the sampling run to the last milking
in the sampling run is 1094 minutes.
The formula gives a 24 h milk yield of: 18 kg × 1440 : 1094 = 23.7 kg
(39.7 lb ×1440 : 1094 = 52.3 lb).
Incorrect calculations
An unsuccessful last milking prior to and during the sampling run gives
an incorrect 24h milk yield calculation. Two examples:
An unsuccessful milking prior to the sampling run: the cow was not fully
milked at the 18:33 h milking. She returns to the milking robot again at
18:48 h where she gave 7 kg (15.4 lb) of milk. The other milkings are the
same. The total milk yield for the period is 25 kg.
The formula gives a 24 h milk yield of: 25 kg × 1440 : 1094 = 32.9 kg (55
lb ×1440 : 1094 = 72.5 lb).
This is 9.2 kg (20.2 lb) too high.
An unsuccessful milking at the last milking of the sampling run: the cow
only gave 2 kg (4.4 lb) of milk at the 12:47 h milking. The total milk yield
for the period is 7.5 kg (16.5 lb).
The formula gives a 24 h milk yield of: 7.5 kg × 1440 : 1094 = 9.9 kg (16.5
kg × 1440 : 1094 = 21.8 lb).
This is 16.2 kg (35.7 lb) too low.
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