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The Relation of Dietary Fat and Fat Derivatives in the Feces of Young Dairy Calves¹

Iowa State Experiment Station

Abstract

1. The dry feces of calves fed skimmilk, which is practically a fat free diet, contained 5.3 per cent of fat which amounted to an average daily excretion of 2.3 grams. Most of this fat probably originated from metabolic activity and not in the food fat. The feces from calves fed a four per cent fat milk contained 22.5 per cent of fat which equalled an average daily excretion of 13.5 grams.
   
2. The coefficient of fat digestion was 92–93 when milk with four per cent of fat in it was fed and after allowance was made for the metabolic fats.
   
3. The most constant fraction of the fecal fat of the calves fed either skimmilk or milk containing fat was the free fatty acids. The most variable fraction was the soaps. The neutral fats tended to vary inversely with the soaps.
   
4. Variation in the quantity of fat in the feces and variations in the fat fractions probably were influenced by fat intake. The larger fat intake increased both the total fat and the soaps in the feces.
   

¹ Journal Paper No. B8S of the Iowa Agricultural Experiment Station. Ames, Iowa, project No. 47.