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Journal of Dairy Science Vol. 41 No. 6 849-856
© 1958 by American Dairy Science Association ®
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The Rate of Machine Milking of Dairy Cows. II. Effect of Vacuum and Pulsation Rate1

W. E. Stewart and L. H. Schultz2

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

Eighteen randomly selected slow-milking cows were milked with a machine operated at various vacuum levels (10, 12.5, and 15) and pulsation rates (20, 50, and 80) for a 27-day experimental period. The nine treatments were assigned at random at the start of each of the three replications included in the above experimental period. Increasing the vacuum level increased the speed of milking and the effect was greater from 10 to 12.5 than from 12.5 to 15 in. Increasing the pulsation rate increased the speed of milking, but the magnitude of its effect was much less than that of increasing the vacuum. Most of the effect of pulsation on increasing the speed of milking occurred from 20 to 50. Increasing the pulsation rate appeared to be more important at low levels of vacuum than it was at high-vacuum levels. Most of the effects of vacuum and pulsation on increasing milking rate were additive. A few treatment interaction terms were significant. In these cases the increases in milking rate expected, had the effects of vacuum and pulsation been additive, were not obtained as a result of this interaction. Changing the vacuum level or pulsation rate affected the cows differently. In general, increasing the vacuum or pulsation caused greater increases in milking rate, percentage-wise, for the slowest-milking group of cows than it did for the fastest-milking group of cows.

FOOTNOTES

1 Supported in part by the De Laval Separator Company, Poughkeepsie, New York.

2 Present address: Dairy Husbandry Dept., University of Wisconsin, Madison.






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Copyright © 1958 by the American Dairy Science Association ®.