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Metabolizable Energy Requirements of Pregnant Dairy Cows

Animal Science Research Division, ARS, USDA, Beltsville, Maryland 20705

ABSTRACT

Energy balance measurements related the amount of metabolizable energy required by the pregnant cow to the stage of pregnancy. The amount of metabolizable energy required at term was 75% above that of a nonpregnant animal of equal weight. The increase in metabolizable energy requirement during the course of pregnancy was described by the equation y = 100.8 + 0.567 e^.0174t where y is kcal ME/kg^3/4/day, and t is number of days pregnant.

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