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Study of Nutritive Utilization of Protein and Magnesium in Rats with Resection of the Distal Small Intestine. Beneficial Effect of Goat Milk

I. Lopez-Aliaga^*,, M. J. M. Alferez^*,, M. Barrionuevo^*,, T. Nestares^*,, M. R. Sanz Sampelayo and M. S. Campos^*,

^* Departamento de Fisiología, Facultad de Farmacia, Campus Universitario de Cartuja, Universidad de Granada, 18071 Granada, Spain.
Instituto de Nutrición y Tecnología de los Alimentos, Ramón y Cajal 4,Edificio Fray Luis de Granada, 18071 Granada, Spain
Unidad de Nutrición Animal, Consejo Superior de Investigaciones Científicas,Camino del Jueves s/n, 18100 Armilla, Granada, Spain

Corresponding author: M. S. Campos; e-mail: marga{at}ugr.es.

The search for diets to improve the nutritive utilization of protein and magnesium in malabsorption syndrome led us to study goat milk, because of its particular nutritional characteristics, and to compare it with cow milk, which is most commonly consumed. We studied the nutritive utilization of protein and magnesium in transected rats (control) and in rats with resection of 50% of the distal small intestine. The diets used were the standard diet recommended by the American Institute of Nutrition and diets based on lyophilized goat or cow milk. The consumption of goat milk produces better protein efficiency ratio and food conversion efficiency values, particularly in rats with intestinal resection, together with a higher nutritive utilization of protein. Magnesium apparent digestibility coefficient is not modified by intestinal resection in rats fed with goat milk-based diet, on the contrary to the standard and cow milk diets. Magnesium apparent digestibility coefficient is greater for the goat milk group, which is reflected in the greater quantity of this mineral stored in bone. These results demonstrate the beneficial effect of goat milk on the nutritive utilization of protein and on magnesium bioavailability, especially in animals with resection of the distal small intestine.

Key Words: protein utilization • magnesium bioavailability • goat milk • resected rat

Abbreviation key: ADC = apparent digestibility coefficient, DSI = distal small intestine, FCE = food conversion efficiency, PER = protein efficiency ratio, MCT = medium-chain triglycerides

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