How do testis look inside? Where are the sperm?

I am dissecting testis here. The idea was to look at some sperm cells, but I could not find any… The testes I ordered from the butcher. In some countries bull’s testes are also eaten and they are also known as “Rocky Mountain Oysters”.

There are several possibilities why I could not find sperm in the testes. Either they died or the bull was too young, or they were present, but too difficult to see, with all of the other cells around. I have also seen several bacteria in the sample, which indicates that the testes were not as fresh as I hoped them to be.