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Abstract
Summary Rats started on experiment in October and grown on mineralized raw milk and mineralized pasteurized milk showed no differences in growth or development over a period of 30 weeks. The average daily gains during the first six weeks for rats on mineralized raw milk were less for the animals started in April than those started in October. In April the rate of growth for rats on pasteurized milk was inferior to that obtained on raw milk. A decrease was observed in the daily rate of growth in male rats on mineralized milk from 19gm. for milk produced in October to 3.32gm. for milk produced in December to 2.45gm. for milk produced in February. The decrease for male rats on pasteurized milk for the same periods was 3.90 to 1.96 and to 1.14gm. The female rats showed some decrease in growth on winter milk but the impairment in. growth during this period was not nearly as great as that, observed in the case of the male rats. The kind of feed ingested by the cow has a greater effect upon the nutritive value of milk than does pasteurization. Pasteurization has practically no detrimental effect, as measured with rats, upon the nutritive value of a milk of high nutritive quality but may further decrease the value of a milk of low nutritive quality.
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