Establishment and Characteristics of Four Sub-Strains of F344 Rats Reared on Various Low Protein and Low Energy Diets

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概要

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• Four sub-strains, reared by sib-mating and having for their origin the F344/DuCrj strain of rats, were established by feeding with different levels of low protein and low energy diets, and their characteristics investigated. The amounts of crude protein (CP) and digestible energy (DE) in the four diets were 17.6%-3.0 kcal, 10.5%-2.5 kcal, 8.4%-2.0 kcal, and 10.5%-2.5 kcal, respectively, and the four sub-strains established here were provisionally designated as F344/Tig1, F344/Tig2, F344/Tig3 and F344/Tig4, respectively. Intakes of nitrogen-corrected metabolizable energy (MEn) did not differ, and a large intake of digestible crude protein (DCP) was observed in F344/Tig1 rats. The body weight of rats provided with lower-nutrient diets showed a tendency to decrease until the F2 generation, but no change among the generations was seen subsequently, and the same compiled differences in protein content were maintained. Similar transitions were observed in the lifetime rearing test. Though F344/Tig3 rats, which were reared on minimum nutrients, showed a tendency to delayed puberty, we were easily able to breed four pairs in every generation using procedures similar to those used for other strains of rats. There were no differences among the F344/Tig1 to -3 strains of rats in body length, digestive tract length, or organ weight per body weight, and all the rats had a normal range of biochemical values. But the F344/Tig4 showed a high glutamic-oxaloacetic transaminase (GOT), and a tendency to decreased liver function and a shorter lifespan. These sub-strains of F344 rats clarified differences in fatty acid compositions, such as docosahexaenoic acid (DHA) in serum, liver and the brain. The rats were intended to be useful animal models for the study of nutritional environments and their influence on the memory and learning.

著者

• ITOH Hiroshi

  Department of Internal Medicine, Keio University School of Medicine

• Kaneko Masahiro

  Department of Biopharmaceutics, Meiji Pharmaceutical University

• Itoh Hiroshi

  Department Of Astronomy Kyoto University

• SHUMIYA Seigo

  Department of Laboratory Animal Science, Tokyo Metropolitan Institute of Gerontology

• Shumiya S

  Department Of Laboratory Animal Science Tokyo Metropolitan Institute Of Gerontology

• Shumiya Seigo

  Department Of Laboratory Animal Science Tokyo Metropolitan Institute Of Gerontology

• Kuramoto Kazunao

  Department of Laboratory Animals Tokyo Metropolitan Institute of Gerontology

• Kuramoto Kazunao

  Department Of Laboratory Animal Science Tokyo Metropolitan Institute Of Gerontology

• Kaneko Masahiro

  Research & Development Center Nosan Corporation

• Itoh Hiroshi

  Research & Development Center Nosan Corporation

• Itoh Hiroshi

  Department Of Aeronautics And Astronautics The University Of Tokyo

• Itoh Hiroshi

  Department Of Advanced Materials Science Faculty Of Engineering Kagawa University

• Kaneko Masahiro

  Department Of Applied Chemistry Seikei University

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