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Response of the Weanling Rat to Alpha- or Beta-Lactose With or Without an Excess of Dietary Phosphorus

Department of Animal Science, University of Illinois, Urbana

ABSTRACT

One hundred twenty weanling male albino rats (Sprague-Dawley) were employed in two 3 x 2 factorial experiments designed to compare effects of substituting -lactose and ß-lactose for the glucose component of diets containing either adequate or excess phosphorus. Rats receiving glucose had no diarrhea and gained faster than rats receiving lactose. Further, glucose-fed rats had more carcass fat but less carcass water and calcium than lactose-fed rats. Pair-gain studies indicated that these carcass effects were independent of gain and final body weight. Rats fed lactose had much larger ceca than those fed glucose. Blood samples taken just prior to slaughter revealed higher hematocrits for rats receiving lactose than for those receiving glucose.

-Lactose effected a greater weight gain than ß-lactose when fed with adequate phosphorus or with excess phosphorus as H₃PO₄. Conversely, with excess phosphorus as Na₂HPO₄, ß-lactose supported a faster rate of gain than -lactose. Excess phosphorus provided as H₃PO₄ uniformly depressed rate and efficiency of gain.