"I hate those little fuckers," he added.

I have calculated that over the course of the last 5 years I have been personally responsible for the death of over 10,000 mice.

About half have met their maker through CO2 asphyxiation, but about 3000 by cervical dislocation from my own hands. The ratio of males to females that I personally sacrificed is overpoweringly skewed to the females, as they are generally calmer and I can easily put 5 in a cage without concern. All the experimental mice are females--for whatever reason.
The others died from disease or some sort of violence that may result during breeding or housing conditions. Over the last year, I have taken to a fun little game of telling the German student who works behind me that I am thinking of him as I sacrifice the animals. This makes him uncomfortable, so I continue.

I also unofficially test the males for their reproductive prowess. If after about 5 minutes of transferred to a new cage with 2-3 females, the male begins forcing himself on one of them, I am happy--because he is "good breeder". There is usually some squeaking and unhappiness from the females, but I just put them back on the shelf and let them be.

Not only is Jebus a mouse serial killer, he's a misogynistic mouse serial killer.

"I have calculated that over the course of the last 5 years I have been personally responsible for the death of over 10,000 mice",

but given your last paragraph, have you not also been responsible for the giving life to thousands of mice?

Slug is the mouseslayer in our domain. I think his total is 4.

C'mon Slug. Pick it up.

I have about seven total confirmed kills, where I've disposed of bodies from traps. However, I've also used poison and, other than one desiccated mouse carcass, you generally don't find the bodies of the mice killed by poison. As a result, I think I'd estimate that I've killed a total of, oh, I don't know, 1,946,733 mice in my lifetime.

i would be hesitant to say that i have personally given life to any mouse, but i will agree that they would not have breed if i did not put the boys with the girls.

However, I’ve also used poison and, other than one desiccated mouse carcass, you generally don’t find the bodies of the mice killed by poison. As a result, I think I’d estimate that I’ve killed a total of, oh, I don’t know, 1,946,733 mice in my lifetime.

And your job is in a state budget office? Oh the poor taxpayer...