Pigs, I’ve heard, pump in a large amount of sperm. Pigs! 
[QUOTE=Gymnopithys]
Pigs, I’ve heard, pump in a large amount of sperm. Pigs! 
[/QUOTE]
I read somewhere they have the lengthiest orgasms as well.
I think wild boars have corkscrew penises.
[QUOTE=fisha]
I think wild boars have corkscrew penises.
[/QUOTE]
“I think”. Way to keep your cover, Katherine the Great.
[QUOTE=Derleth]
It’s important to have a job that makes a difference.
[/QUOTE]
Wow - nice “Clerks” reference!
I think most of these answers are forgetting this part of the OP’s question:
[QUOTE=Shalmanese]
as a proportion of body mass?
[/QUOTE]
Elephants & sperm whales produce a large quantity of ejaculate, but they are also massively big animals. So the proportion is likely to be rather small.
I’d think the answer would be some very small creature, on a proportion basis.
[If the OP had included plants, they would probably win – they are more efficient than animals at this. The common garden tomato would be a good contender – the edible parts are the reproductive seed of the plant, and over a season they grow much more produce than the weight of the plant itself.
[QUOTE=Rigamarole]
That’s what instantly popped in my head when I read the thread title. I was about to say, “Well, I haven’t exactly sampled all of them”
[/QUOTE]
The days not over yet.
[QUOTE=Least Original User Name Ever]
“I think”. Way to keep your cover, Katherine the Great.
[/QUOTE]
Самый лучший смех сегодня. Спасибо.
[QUOTE=fisha]
Самый лучший смех сегодня. Спасибо.
[/QUOTE]
I can’t understand your crazy Moon language.
According to an article in Nature (Nov.8.2007). the males of Drosophila mojavensis looses 2-3% of its body weight with each eajaculation - and they mate several times a day.
Great Tick reference, Derleth!
And then one can erect a statue of the species and try to attract a male for a donation, but you cannot guarantee who shows up.
See pics of a moose mounting a bison statue in, according to another source, Big Sky, Montana., but Colorado has staked a claim.
[QUOTE=Chronos]
Semen is collected from almost all domesticated animals, for use in artificial insemination. I would be rather surprised if this were not also the case for elephants. Tha apparatus is a bit more sophisticated than a magazine full of naked elephant cows and a bucket, though.
[/QUOTE]
I now understand why elephants evolved with trunks.
My vote goes to the Ostracod