Milkline vacuum stability in milking machine installations.

The direct connection between the transient vacuum drop and its cause could be established for most drops during milking observations. A high frequency of transient vacuum drops in the milkline was associated with a high level of mastitis and a high new infection rate as inferred from changes in somatic cell counts for individual cows. The frequency of vacuum drops during one milking is only a rough indication of the long-term vacuum stability
During milking the teat cup liner is the interface between the teat of a dairy cow and the milking system
Milking performance of milking machines that matches the production capability of dairy cows is important in reducing the risk of mastitis, particularly in high-producing cows.
Examination of the milking performance of the milking system with a milking-time test allows an evaluation of the performance that can cope with high producing cows, indicating the possibility of reducing the risk of mastitis caused by inappropriate claw vacuum.

Regulator Airline

Differences in vacuum levels between the receiver and regulator should not exceed 0.6kpa. The most common cause of ineffective vacuum regulation is an excessive vacuum difference between the receiver and regulator because of either improper regulator location or excessive restrictions in pipelines and fittings between these two components. Regulators mounted on branch lines often perform inefficiently unless the connecting lines are adequately sized to minimize frictional losses. Branch lines are fine as long as they are sized
Regulators mounted on or near the distribution tank often tend to oscillate because of the cyclic vacuum changes in pulsator airlines. Preferably, the regulator (or its sensor) should be connected near the sanitary trap so that it can sense, and quickly respond to, vacuum changes caused by “unplanned” air admission entering the system through the teatcups

Why Vacuum Level is important

Vacuum level impacts unit on time. “The higher the vacuum the higher the milking speed or so we think.
A Teat end exposed to or above (42 kPa).” Measurement should be taken at milking”
Along with an incorrect B phase will increase peak flow. However, this also increases liner compression. High liner compression will increase hyperkeratosis.

NMC add two additional points ; Five Point Plan
Now the Seven Point Plan
For decades, the 5 Point Plan for Mastitis Control served the dairy industry well, significantly reducing the number of clinical cases of mastitis, levels of bulk tank somatic cell count and prevalence of mastitis caused by contagious bacteria.
The long‐standing five points are:
1) Disinfect all teats at every milking
2) treat all cases of mass promptly and record data;
3) Use dry cow treatment on all cows;
4) cull all cows with three or more cases of mass;
And 5) maintain the milking machine properly.
The new plan adds two more points – milk a clean, dry and disinfected cow, and use nutrition, stimulants and vaccines to improve immunity