Transcript 8TH_GRADE_files/Unit 10

Unit 10
Dairy Science
Major Uses of Dairy Cattle
U.S. Average Dairy
Consumption
28.8 gallons of milk
26.8 pounds of cheese
16 pounds of ice cream
4.3 pounds of butter
4.3 pounds of yogurt
Milk Production
• Selective Breeding
– Choosing superior livestock to
fill herds to improve genetics
• BST Hormone
– Naturally occurring
– Increases milk production
– Controversial
• Feeding Systems
– Grazing
– Lots
Milking Steps
1)
Cow enters the parlor
2)
Udder is cleaned and dried
3)
Milking machine is attached
to the teats
4)
Cow is milked
5)
Cow is disinfected and
released to her pen
Dairy Processing
• Milk
– Carefully tested
– Pasteurized
– Separated into cream and skim
portions
• Cheese
– Americans eat 25 lbs. per year
– Bacteria culture is added for
fermentation
– Rennet is added to speed the
process
– Ripens at specific temperature
and time