Then explain why i have a stock of 500 mice same genes past 5 years and this year they arent doing squat. Same food,same water and same room temps nothings changed in 5 years. Rats are fed same food and same water and drop litter after litter non stop
I truly believe mice that are inbred too far will not breed as well. Till this year i was producing 500 mice a month and be lucky to produce 100 a month right now.