Pen Moves affecting Parlor Milk
When a cow gets moved
from one pen to another pen, does this "move event" affect milk production?
Often, this analysis
only looks at the animals that moved, and not the “negative controls” or
similar animals that did not move. This report – Milk response after moves -
- can be used to see how the animals that moved responded versus the animals that
did not move in the same DIM window. This report will only return values for
farms that utilize parlor records/data and not single test day values.
Animals that were moved
within a 10-day DIM window are compared to animals that were not moved in the
same DIM window. Milk values are the difference between the 7-day average daily
milk yield (parlor milk avg) following the 10-day window and the 7-day average
daily milk yield prior to the window. This accomplishes two main objectives. It
mitigates the effect of the transient drop in milk due to the act of moving the
cow while determining whether there is a sustained deviation from similar cows
which were not moved.
In the report, there
are two main item types – “Milkxx_yy” and “Movexx_yy”. Milk refers to the difference
in the 7-day average daily milk yield from “yy to yy+7 DIM” compared to “xx-7
to xx DIM”. Move refers to whether or not a cow was moved between the DIM “xx”
and “yy”. If the cow was moved, she receives a value of “1”. If the cow was not
moved, she receives a “0”. And, if the cow has not reached a DIM of “yy”, the
value is blank or “null”.
Figure 1 - move between 30 & 40 DIM
Figure 2 - move between 100 & 110 DIM