Page 188 - Calculating Agriculture Cover 20191124 STUDENT - A

15-16 Metric Measurements CH 15]

Converting pounds of milk to liters of milk:
Raw milk doesn't weigh the same as water because of the solids content of milk, so you can't do
a straight conversion of mass to volume:
Milk weighs 8.6 lb/gallon (U.S. gallon)
There are 3.79 liters/U.S. gallon
Therefore: 8.6 lb/ 3.79 liters = 2.26 lb/liter of milk
Therefore: 100 lb/2.26 lb = 44.25 liters/cwt milk

Example: A mature Ayrshire cow will produce 18,000 pounds of milk annually. Presume the
cow’s peak production is at 89% of production. What would be the anticipated liters of
milk production for her second calving?

Solution
Step 1: calculate pounds of annual production
Milk production = Pounds annual milk production mature cow x peak % production
Milk production = 18,000 x 89 %
= 18,000 x 0.89
Milk production = 16,020 pounds Total pounds produced

Step 2: convert pounds of milk to gallons
Cwt = total pounds produced ÷ 8.6 lbs/gallon
= 16,020 # ÷ 8.6 #/ga
Cwt = 1,862.79 gallons

Step 3: calculate liters of milk from the gallons of milk.
liters = gallons produced x metric factor
= 1,862.79 gallons x 3.79 liters / ga
liters = 7,059.97 liters of milk

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