You absolutly do not need a night light, and in fact, it may be at least part of yur problem. Rodents do best with a distinct day/night cycle, and the night cycle should be as dark as possible. 12 on, 12 off is good, 14 on, 10 off is good too, 15 on may be a little much. Age & change seem to be the worst things for mice. Are they too old? Has there been any new people in your rodent room lately? Has there been any new additions to the colonies? Are you sure you have one male in each instead of two? Has there been people who smoke near your rodents? Mice are much more sensative to things like that than rats are. Are you running out of food or water ever? Is there temperature fluctuations? They do best at about 70 - 75 degrees. Has it gotten overly hot lately? It'll kill the males sperm if it has. Take a hard look at it is all I can say.

Paul Edwards

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• Do rodent rooms need nightlight or total darkness okay?.........more - tomsey, Sun Nov 23 19:12:53 2003
• RE: Do rodent rooms need nightlight or total darkness okay?.........more - Paul Edwards, Tue Nov 25 20:06:16 2003
• Thank you Paul for the response.....very helpful!! n/p - tomsey, Tue Nov 25 22:24:47 2003