Abstract

A new type of nozzle for drinking water supply to mice was devised. The main advantageous characteristics of the devised nozzle when compared with the nozzle used ordinarily are as follows; 1) The stress of elastic gum is used as the pressure of valve, by which the power pressing valve became much stable (Figs. 1 vs. 2) . 2) Unnecessary passive withdrawal of water through push bar much decreased. 3) The structure is very simple and is suitable for mass production (Figs. 1 vs. 2) . 4) The power for drinking water is small (within 5 g) (Fig. 9) and drinking is very easy even in young mice. Employing this type of nozzle, the growth, reproduction, amounts of water and food consumed were quite normal (Figs. 10, 11 and 12) . The devised nozzle is applicable to the feeding of mice in an isolator as well as in a cage with wood shavings.

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