Reviewing how milking shifts perform compared to each other can help you use data to demonstrate efficacy of milking preparation. Differences in two-minute milk letdown, durations, and detaches can all be indicators of sub-optimal milking preparation
The first two-minute yield is going to be primarily impacted by milking prep procedures. This report uses the same data, but instead of grouping by milking unit, we are going to group by milking shift number. Adding the manual and manual detach counts that some parlor interfaces send, can also be useful.
Here I want to look at individual shifts and using my knowledge of the dairy apply my expectations of differences in shifts. In this particular sample report above, you can see that the third (night) shift has about 4% less milk in the first two minutes, and has 5 seconds longer duration with 1.2 pounds greater yield (3.7% greater).