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Composite vs. Fresh Samples of Milk for Determining Percentage Butterfat of Cows on Herd Test^*

Dairy Husbandry Department, South Dakota State College, Brookings, South Dakota

ABSTRACT

Breeders of dairy cattle recognize the importance of testing their herds for production, yet less than five per cent of the dairy cows in the United States are being tested. The several Breed Associations are no less anxious to have a large percentage of the cows in their respective breeds on official test. Continuous testing for production is accepted as an essential to progress of the breed and for the best interest of the breeder. Therefore every effort should be made to have as many cows as possible on test continuously.

To encourage dairy cattle breeders to maintain their herds on test continuously the cost should be at a minimum consistent with accuracy. Taking individual samples of milk from each cow over one- or two-day periods and testing these samples in duplicate, obviously requires considerable time. This time is justifiable if this were the only method by which one could get an accurate test on a cow.

^* South Dakota Agricultural Experiment Station Journal Series No. 170.