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Performance of Rats Fed Fish Flour or Casein as the Sole Source of Dietary Protein Through Four Generations

Division of Animal Nutrition, University of Illinois, Urbana, Illinois

When fed as the sole source of dietary protein, a desiccated, defatted and deodorized fish flour prepared from whole fish by azeotropic solvent extraction using ethylene dichloride proved to be superior to casein for the reproduction and general performance of rats through three matings of the first generation, 7 matings of the second generation and 7 matings of the third generation. The pregnancy rate of animals consuming the fish flour was maintained through an additional 4 matings of the third generation and 5 matings of the fourth generation. Histological examination of 12 organs and tissues from animals of the first, second and third generations showed no differences between animals receiving fish flour or casein protein.

Manuscript received 10 July 1962.