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Utilization by the Rat of Nitrogen, Calcium, Phosphorus, and Magnesium in Sterile Concentrated Milk Stabilized with Polyphosphates¹

Department of Animal Science, University of Illinois, Urbana

ABSTRACT

The effects of processing and addition of polyphosphates upon the nutritive value of ultra high-temperature short-time sterilized concentrated milks were investigated. Diets containing 9% protein from spray-dried whole milk, or from sterile concentrated milks with and without 0.2% polyphosphate additives, were fed in growth restricting amounts to weanling rats in a reversal experiment. Food intake, fecal and urinary loss were determined for nitrogen, phosphorus, calcium, and magnesium. Analysis of variance indicated that no significant difference in protein quality exists between the various milks tested as assessed by biological value or by true and apparent digestibility of nitrogen. The retention of phosphorus and calcium was not appreciably affected by addition of polyphosphates to sterile milk concentrates, but the apparent absorption of both minerals was significantly higher. Magnesium from the spray-dried whole milk diet was absorbed to a significantly greater extent than was magnesium from only one of the ultra high-temperature short-time sterile concentrated milk diets containing polyphosphates. It is possible to conclude that young growing rats are able to utilize the phosphorus, calcium, magnesium, and proteins of sterile concentrated milks containing polyphosphates as well as do rats fed spray-dried whole milk or concentrated milk without added polyphosphates.

¹ This paper is part of a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Master of Science in Home Economics in the Graduate College of the University of Illinois.

² Present address: Argonne Cancer Research Hospital, 950 E. 59th Street, Chicago, Illinois.