Although considerable data from studies of short duration indicated factors in the operation of milking machines which affected rate of milking In mastitis-free first-calf heifers milked at vacuum levels of 10, 13, or 17 in. of mercury for a 40-week period, no appreciable differences in milk yield were observed (10). However. with an increase in Vacuum level, milking time decreased and rate of flow increased. The time spent in stripping and the amount of strippings, the latter expressed as a percentage of total yield, appeared to be least for the 13in. group; whereas time to reach peak rate of flow was not significantly affected.
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Caruolo et al. (1955) studied this question.
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