University of KentuckyCollege of Agriculture
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Understanding Sampler-Weigher Inspections

1. Information, including each producer number and producer milk weight, are recorded from the sampler-weigher’s ticket(s) or manifest(s). Each producer sample and the Load Sample are collected and analyzed by Regulatory Services.

2. Each producer weight is multiplied by its corresponding butterfat test. The result of this calculation is known as the pounds of “butterfat bought” from the producer.

3. The “butterfat bought” for each producer is added to give the “total butterfat bought” for the entire truckload of milk.

4. The sampler-weigher’s recorded weights for each producer are added to give the total weight of milk picked up for the truckload.

5. The “total butterfat bought” is divided by the truckload’s total weight of milk. The result of this calculation is the weighted average butterfat test for the truckload of milk. (The weighted average is not used to calculate the inspection grade. However, it is a good general indicator of the sampler-weigher’s performance when compared to the load sample’s butterfat test.)

6. The load sample’s butterfat test is multiplied by the total weight for the truckload of milk. The result of this calculation is known as “butterfat received”.

7. The “butterfat bought” is then subtracted from the “butterfat received”. This is referred to as the “difference” in the pounds of butterfat bought and received.

8. This “difference” is then divided by the “butterfat received” (which was determined by the load sample). The result of this calculation is the % difference of the butterfat bought and received.

9. The % difference is then used to evaluate the sampler-weigher’s performance by using the Grade Scale below.

% Difference in butterfat bought & received
A= 0 to 0.50% Excellent
B= 0.51 to 1.0% Good
C= 1.01 to 2.0% Poor
D= Above 2.0% Unsatisfactory
“D” Grades may be given for missing samples or other violations of regulations.