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Lactation Studies. III. Milk and Milk Fat Yields Comparing Three Twice-daily Milking Schedules¹

Department of Dairy Husbandry, University of Minnesota, St. Paul

ABSTRACT

To compare the effects of equal and unequal twice-daily milking, 17 sets of identical and two sets of fraternal twins completed 58 lactations during two experiments. Twelve pairs of lactations compared 10–14 and 12-12 hr intervals and 17 pairs of lactations compared 8–16 and 12-12 hr intervals.

Cows in Experiment I were milked on 10–14 or 12-12 hr milking intervals for entire lactations. In Group One of Experiment II, both pair members were milked at 12-12 hr intervals for a control period which averaged 56 days. In Group Two, sets of twins were milked at 8–16 hr intervals for a control period averaging 40 days. Following the control period, one pair member was milked on 12-12 and the other on the unequal hour intervals for the remainder of the lactation.

Within-pair variation in time pregnant while on experiment and differences in level of initial production were taken into account in the discussion relating production with milking schedule. No significant difference in production and persistency of lactation attributable to milking intervals was found in either experiment.

¹ Scientific Journal Series Paper No. 5084, Minnesota Agricultural Experiment Station.