We’ll start by evaluating peak milk for the cows with a dry period less than 45 days using the DairyComp command: SUM PEAK FOR DDRY=1-45 LACT>1
From that command, we find that the dairy has 88 cows in that group with a peak milk of 103 lbs.
Next, let’s look at the cows with a dry period of 46-70 days using the command:
SUM PEAK FOR DDRY=46-70 LACT>1
We find 62 cows, with a peak milk of 112 lbs.
We know that 1 lb. of peak milk is equal to 250 lbs. in a lactation on a mature cow, and have identified 9 lbs. of peak milk difference between dry period lengths using our DairyComp command. By calculating 9 lbs. of peak milk difference x 250 lbs./lb. peak, we can see we are losing 2,250 lbs. of milk per cow in following lactation with the shorter dry period length.