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10. Effects of low vacuum levels on vacuum dynamics during milking

Author

Lelia Murgia, Maria Caria, Antonio Luigi Pazzona, Luisella Sistu, Pazzona, A., Caria, M., Murgia, L., and Sistu, L.

Subjects
medicine.medical_specialty, Materials science, Operative parameters, Vacuum fluctuation, Sheep, Milking, Physics::Medical Physics, technology, industry, and agriculture, food and beverages, Mechanics, Milking, Surgery, body regions, General Relativity and Quantum Cosmology, fluids and secretions, surgical procedures, operative, Low vacuum, medicine, Animal Science and Zoology, Tube (fluid conveyance), lcsh:Animal culture, lcsh:SF1-1100, AGR/09 Meccanica agraria
Abstract

One of critical points of the milking unit is the short milk tube. Here milk plugs can cause abrupt variations in vacuum which are stressful for the animals. Our trials allowed us to define the effects of the operational vacuum and pulsation on vacuum stability in the short milk tube. Reducing the vacuum from 42 to 28 kPa did not produce appreciable variations in vacuum fluctuation. It was 9.2 kPa for the low vacuum and 9.8 kPa for the standard vacuum. Changing the pulsation rate from 150 to 120 cycles/min did not modify the vacuum stability in the short milk tube. By contrast, raising the pulsation ratio from 50% to 60% significantly increased the amplitude of vacuum fluctuation in the short milk tube.

Published
2007
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