5.1501.8502.0 A
5-18 Operating Instructions
5.5.3.3 Export Milk Sampling Data to a File in T4C
1. In T4C go to: Data Export > Milksampling Export.
2. Click on the Export Type.
3. Fill out the form.
4. Click on the button Export, or on Send Email if you want to send the file by email.
5.5.4 Calculate the 24h Milk Yield
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:
1. 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.
2. 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.
in n o vato rs in agriculture
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