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The Net Energy of Blackstrap Molasses for Lactating Dairy Cows¹

Department of Animal Science, University of Hawaii, Honolulu

ABSTRACT

The net energy of cane or blackstrap molasses for lactation has been determined when added to a basal ration of pineapple bran, soybean meal, dicalcium phosphate, and tracemineralized salt. When fed at a level of 10 and 30% of the total ration, the net energy of the molasses was 68.1 and 23.1 meal, per 100 lb., respectively, compared to 54.2 meal, for the basal ration. A comparison of the net energy values with total digestible nutrients and digestible energy indicated that the high loss of energy when molasses was increased from 10 to 30% in the ration was not due to increased fecal loss.

The addition of 30% molasses caused a significant decrease in percentage of butterfat and solids-not-fat in the milk, resulting in a lowering of the energy value per unit of milk produced. Milk from the cows fed 30% molasses also tended to score lower than the other milks in flavor tests. The lowered flavor score appeared to be associated with an increased rancidity. Ten per cent molasses produced none of the undesirable effects exhibited by the 30% molasses.

The caloric value of the milk solids was found to be very closely related to the fat content of the milk (r = 0.98). The relationship was described by the equation Y = 4.516 + 0.321X, where Y is the kilocalories of energy per gram of milk solids and X is the per cent butterfat in the fluid milk. The error of the regression coefficient was 0.043.

¹ Approved by the Director of the Hawaii Agricultural Experiment Station as Technical Paper No. 459.

² On leave from the Department of Animal Husbandry, University of California, Davis.

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