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Factors Associated with Variations in the Nutritive Value of Dried Whey for the Rat

University of Illinois, Urbana

Abstract

Three experiments involving 175 weanling male albino rats were conducted to evaluate nine spray- or roller-dried whey samples as a source of protein or energy. When dried whey was fed as the sole source of protein in diets containing 6% protein and 37% lactose, processing method had no significant influence on the nutritive value of the protein. Wide variation in nutritive value was found among spray-dried and among roller-dried samples. Weight gain and protein efficiency both showed significant correlations, negative with moisture and positive with lactose level.

When dried whey was fed as 60% of a diet containing adequate protein from casein plus methionine, rats fed roller-dried samples gained significantly faster and more efficiently than those fed spray-dried samples. Again, there was considerable variation among nutritive values of the dried whey samples within processing method. Regardless of drying method, the phosphorus content of the dried wheys was significantly negatively correlated with the incidence of diarrhea.

Spray-dried wheys were more variable than roller-dried wheys in their diarrhea scores in both Experiments I and II.

Lysine supplementation significantly improved the performance of rats fed a poor-quality dried whey.