UNDERSTANDING - 10 - AOC_Patterns Milk Flow Rate (Parts 1 and 2)

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* 1. Enter your first and last name

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* 2. Understanding the patterns of the milk flow rate within one pulsation cycle can help to predict how adjustments in the pulsation rate and ratio influence milk flow rates.

True

False

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* 3. When the liner is fully closed, it wraps completely around the end of the teat.

True

False

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* 4. Milk starts flowing from the teat as soon as the liner walls separate in the a-phase of pulsation.

True

False

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* 5. The size and shape of the teat sinus stay about the same when the liner opens and closes.

True

False

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* 6. Milk stops flowing from the teat because:

the force applied by the closing liner pinches the teat canal shut

the closing liner cuts off the vacuum from the teat end

the closing liner partially closes the teat sinus

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* 7. When the liner is fully closed, the teat end shape:

is more like a triangle or a wedge than when the liner is open

is about the same as when the liner is open

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* 8. As the liner closes, the teat canal closes:

from the top down

starting in the midsection, and progresses both upward and downward

from the bottom up

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* 9. Select all that apply. Increasing liner tension:

moves the point at which the teat canal first closes higher up on the canal, closer to the sinus

squashes the teat apex (teat end) more completely

increases liner compression

reduces vacuum at the teat end when the liner is closed

moves the point at which the teat canal first closes lower on the canal, closer to the teat end

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* 10. As the liner opens, the teat sinus:

expands in volume

decreases in volume

remains fully open

remains closed

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* 11. A properly operating milking machine will have no effect on teat tissue during milking.

True

False

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* 12. A properly operating milking machine will have no effect on teat tissue during milking.

Yes

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* 13. The liner closes faster than it opens.

True

False

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* 14. If the "true" milk-to-rest ratio (percentage of time that milk is actually flowing from the teat during each pulsation cycle) is kept constant, the total time during which milk flows in a minute will be constant for any pulsation rate.

True

False

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* 15. If the pulsation ratio and the "true" milk-to-rest ratio are kept constant, will changing the pulsation rate change the milk flow rate?

Yes

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* 16. Reduced milk flow rate within the b-phase of one pulsation cycle is primarily caused by:

increasing vacuum at the teat end

progressive accumulation of fluid in the tissues surrounding the teat canal

increasing liner compression

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* 17. Why does the milk flow rate increase as the pulsation rate increases (with the same pulsation ratio and an adequate d-phase)?

because the b-phase becomes shorter, and only the peak flow that occurs right after the liner opens and before the teat end becomes congested is picked off

because the teat canal opens more times per minute

because the teat barrel is squeezed more often

because the teat-end vacuum is higher

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* 18. If the massage action is reduced by either a shorter d-phase, or insufficient liner compression, when the liner is closed:

the average milk flow during the b-phase will increase

the peak milk flow will be reduced when the liner is opened

the pattern of milk flow during the b-phase will be the same

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* 19. When liner compression is reduced, the amount of milk obtained per cycle increases.

True

False

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* 20. Select all that apply. As liner compression increases:

milk flow does not stop completely during the pulsation cycle

milk flow rates are slower because the teat muscles become fatigued

more fluid is squeezed out of the teat end during the massage phase, and the milk flow rate is faster in the next milk phase

hyperkeratosis increases

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* 21. Indicate the sequence (from 1 to 9) in which the events occur during one pulsation cycle, beginning with the start of the a-phase.

1. the liner walls first touch (closing touch point)

2. the liner walls separate (opening touch point)

3. the c-phase of pulsation starts

4. the liner is half closed (and closing)

5. milk flow stops

6. full milk flow occurs during the b-phase of pulsation

7. milk flow starts

8. the liner is fully open

9. the liner is halfway open (and opening)

8,2,6,7,9,5,1,4,3

8,6,9,1,4,3,2,5,7

2,6,7,1,4,3,8,9,5

1,5,4,3,8,2,6,7,2