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The Effect of Nursing Calves on Milk Production of Identical Twin Heifers

Department of Dairying, University of Tennessee, Knoxville

ABSTRACT

Four pairs of identical twin heifers of the Jersey and Guernsey breeds were used in six lactation periods to compare the production of heifers milked in the usual manner with that of heifers that nursed their calves until they were of vealing size. Milk production in the first week after vealing averaged 5.1 lb. per cow per day lower in the nursed group than in the milked group. Lactation of the nursed groups increased gradually after vealing until at 6 weeks the groups were producing equally. The total loss of milk due to the calf nursing averaged 1,496 lb. per cow.