栄養学的にみた各近交系マウスの特性-1-

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Four strains of mouse, aa, dd, rr, and ss were tested by digestion and nitrogen balance techniques. Thirty-day-old male mice were used. After preliminary feeding for a week, six mice were selected form each strain as test animals, their weight and conditions being taken into consideration, and were fed two test rations. Rstion I was composed of fish meal, polished barley, ground corn, wheat bran, etc. (protein level, 17%) and ration II was mainly composed of polished barley (protein level, 8%).The results obtained are as follows.1) When the mice were fed ad liditum, they ingested a amallar amount of ration II than that of ration I. It seems that the mice fed ration II reduced their appetite slightly.2) There were significant differences among the strains in digestibility of dry matter and crude protein of ration I.3) All the mice of every strain fed ration II gave low values of nitrogen balance and, especially, those of the rr strain gave negative values. Nitrogen accumulation was the lowest in the rr strain of the four strains fed ration I.4) The amount of feed required for each gram of gain in the body weight was different considerably between the as and rr strains.5) The variation among individual mice shown in the digestion trial was smaller in the dd strain than in any other strain.To ascertain the genetic significance of observations mentioned above, further studies may be required.
社団法人日本畜産学会の論文