MILKING SYSTEM

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MILKING SYSTEM

• AVS 172
• AMIN AHMAZADEH Ph.D.

References Dr. H.D. Tyler, Iowa State University
and Dr. M. A. Barnes, Virginia Tech
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Air intake line
exhaust
Vacuum pump
condenser
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4. Balance Tank
5. Regulator
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4._________________
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Carries vacuum to milking unit (fed by reserve
tank)
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Pulsation Hose
6. Pulsator Vacuum line
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Milk Hose
Milk hose delivering milk from the udder to milk
line
10. Milk Line
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10. Milk Line
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11. Receiving Jar
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12. Milk Pump
Pumping milk from receiving jar to the milk tank
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Cooling Plates
Decreasing milk temperature before is stored in
the milk tank
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13. Milk Tank
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Milking Equipment

• Milking unit
• Each has four individual teat cups attached by
  hoses to a unit pulsator
• Each teat cup has a teat-cup liner

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Fig 32-7. The milking claw is designed to harvest
milk with the least amount of damage to teat end
tissues (Courtesy of Westfalia)
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Fig 32-8. Teat cup liners must be replaced at
regular intervals to maintain optimal function of
the milking system (Courtesy of Westfalia)
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Milking Systems pulsators

• allow alternating vacuum/atmospheric pressure
  into teat cup chamber
• attached to pulsator vacuum line
• 1 pulsator/milking unit

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Pulsation Milking PhaseResting Phase

• Milking Phase is the expansion phase
• Massage phase
• Initiated when air is pumped into the space
  between the liner and outer shell

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Fig 32-12. Vacuum diagrams visually display the
inner workings of the teat cup liner, allowing
otherwise invisible problems to be detected
(Courtesy of Westfalia)
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Fig 32-10. Proper milk let-down procedures
stimulate dilation of the teat sphincter,
permitting faster flow of milk from the teat end
and more rapid milking times (Courtesy of
Westfalia)
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Milking Systems pulsators

• Pulsation rate
• vac/atm milk/massage
• Pulsation ratio
• vac/atm milk/massage
• wider faster milk out
• too wide increases congestion

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Fig 32-9. The mechanics of machine milking
(Courtesy of Iowa State University)
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Back Flush
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Milk Flow Rate

• Controlled by pressure differential around the
  streak canal
• Determined by pressure exerted by the milk in the
  udder and pressure exerted by vacuum pump and
  pulsator
• Controlled by size and tautness of streak canal
• Can be affected by intensity of stimulation, age
  of cow, effects of teat injury

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Fig 32-13. Changes in milk flow rate during the
milking cycle (Courtesy of Westfalia)
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Milking Procedures

• Prepare equipment
• Assemble and sanitize
• Preparing the cow
• 1) Clean cows teat and pre-dip
• 2)
• 3) Strip 2-3 streams of milk from each teat
• Examine for evidence of mastitis
• 4) Make sure you have a full ten seconds of teat
  end stimulation

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Fig 32-14. Whether using paper or cloth towels,
it is important to thoroughly dry teats,
especially teat ends, prior to applying the
milking machine (Courtesy of Howard Tyler)
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Fig 32-15. Strip cups can be used to check for
the presence of clots in milk strippings
(Courtesy of Iowa State University)
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Milking Procedures

• 5) Attach teat cup and begin
• Approximately 45 seconds after stimulation,
  attach teat cup
• Most cows will milk out within 3-6 minutes
• 6) Removing the teat cup
• Remove when flow rate is less than two pounds per
  minute
• Automatic take-offs
• Following milking dip teats with disinfectant
  solution
• 7)

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Fig 32-17. Kinking inflations prior to attaching
milking units minimizes air leaks and vacuum
fluctuations at the teat end (Courtesy of Howard
Tyler)
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Fig 32-23. Post-milking teat dipping is important
to protect the mammary glad from pathogen entry
until the teat sphincter closes (Courtesy of
Westfalia)
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Fig 32-25. Clean-in-place systems allow milking
units to be cleaned and sanitized in the parlor
between milkings (Courtesy of Westfalia)