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The effect of altering teat
end vacuum levels on milking characteristics |
The present ISO standard (ISO 6690, 1996) for
milking machines specify that flow capacity of milking units should
be proportional to the amplitude of vacuum fluctuation. This standard
is presently been revised and international experts involved in
the revision agree that vacuum level at the teat-end during the
b-phase of pulsation is a more important measurement than the
level of vacuum fluctuation. While the amplitude of vacuum fluctuation
at the teat-end recorded during flow simulation for wide-bore
tapered liners is high with simultaneous pulsation the vacuum
loss during the b-phase or milking phase is low and fast milking
was achieved in the present trial with simultaneous pulsation
and 16mm bore LMT. Worstorff and Hollweck (1995) showed that the
presence of large vacuum losses reduced milk yield and increased
milking time. In the present trial increasing the vacuum loss
did not affect milk yield.
There is a practical benefit in increasing the bore of the LMT
with either simultaneous or alternate pulsation with wide bore
tapered liners in terms of less time required for the milking
process. Most milking plants in Ireland have a milk tube bore
in the range 13.5-14 mm. The results indicate that new milking
plants and conversions should have 16mm bore LMT and 16mm bore
entries in the milk pipeline. During the flow simulation tests
the vacuum variations were similar in the claw and at the apex
of the artificial teat. Thus measurements of vacuum taken in the
claw during actual milking represent teat end conditions. |
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