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The Effect of Complete Evacuation of the Mammary Gland by Pitocin upon Milk and Fat Production^*

University of Minnesota, St. Paul, Minnesota

ABSTRACT

1. The results are given of complete evacuation of the udder by the injection of Pitocin upon the milk and fat production of five cows in the declining phase of lactation and of three other cases of natural incomplete let down of milk.
   
2. In all cases of declining lactation complete evacuation of the gland checked the downward trend of the lactation. In all but one case the milk production was significantly increased over the control period.
   
3. On the basis of the results obtained on three cows with the evacuation of the gland by the injection of Pitocin it is suggested that in many cases the lack of persistency is due to the incomplete let down of milk.
   
4. Any milk retained in the gland has a depressing influence upon subsequent production.
   

^* Scientific Journal Series Paper No. 2129, Minnesota Agricultural Experiment Station.