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Some Factors Involved in Efficient Milking^*

Division of Dairy Husbandry, University of Minnesota

ABSTRACT

Data are presented to show the effect of some of the common milking practices on milk and butterfat production. The practical significance of the muscular contraction theory of milk ejection is shown in part, and some of the old problems of milk ejection are explained using this theory. The results of this series of investigations may be summarized as follows :

1. Delayed stripping after milking by machine has little or no effect on milk and butterfat production.
   
2. Manipulation of the udder by washing and stripping twenty minutes before milking begins causes an appreciable decrease in milk and especially fat productions.
   
3. When individual quarters are milked successively, there is a progressive decrease in both the amount of milk and of fat.
   
4. That the progressive decrease in amounts of milk and fat of suecessively milked quarters is not due to lowered secretion of milk but is due to failure of completely "letting down" the milk is proven by the expulsion of the milk from the udder by the aid of obstetric pituitrin.
   
5. Proof is furnished that rapid milking is conducive to large milk flow.
   
6. The reason for lowered production from manipulation of the udder some time before milking and from a prolonged milking process is tentatively explained as being due to a dissipation of the oxytocic principle in the blood.
   

^* Scientific Journal Series Paper No. 1841, Minnesota Agricultural Experiment Station. Prepared with the assistance of Work Projects Administration, Official Project No. 665-71-3-69. Sponsor: University of Minnesota.