Milking System Note

7/30/2019 Milking System Note

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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

Vacuum

pump

exhaust

condenser


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4. Balance Tank

5. Regulator


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4._________________


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Pulsation line

Pulsation

Hose

Pulsator

Carries vacuum to milking unit (fed by reserve tank)


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6. Pulsator

Vacuum line

Pulsation

Hose

7.Pulsator


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Milk Hose

10. Milk Line

7.Pulsator

Milk hose: delivering milk from the udder to 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 fromreceiving jar to the milk

tank


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14.Sanitary Trap


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Cooling Plates

Decreasing milk temperature before is stored in the milk tank


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13. Milk Tank

Cooling

system

Control


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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 alternatingvacuum/atmospheric

pressure into teat cup

chamber

attached to pulsator

vacuum line

1 pulsator/milking unit


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Pulsation: Milking Phase

Resting Phase

Milking Phase is the expansion

phase

Massage phase

Initiated when air is pumped

into the space between the linerand outer shell


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Fig 32-12. Vacuum diagrams visually display the inner workingsof 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 theteat 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 byvacuum 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 themilking 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 minutes6) Removing the teat cup

Remove when flow rate is less than two poundsper 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 protectthe 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 saniti ed in the pa lo bet een milkings (Co tes of Westfalia)

Milking System Note

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