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The Effect of Relaxin upon Milk Ejection I. The Let-Down Effect upon Sheep

Departments of Animal Husbandry and Dairy Husbandry, South Dakota Agricultural Experiment Station, Brookings

ABSTRACT

Ten sheep were hand-milked after the lambs had been removed 12 hours to determine normal milk let-down, effect of 500 G.P.U. of relaxin on let-down, and the use of 10 I.U. of oxytocin to evacuate the gland. On the average, 39.1% of the total milk produced was obtained with no injection; an additional 43.5% of the total milk produced was obtained after 500 G.P.U. of relaxin was injected; and 17.4% of the total milk produced was obtained by evacuating the gland with 10 I.U. of oxytocin.