The only mammal meat I can think of that is used in home aquatics is beefheart, usually used for discus. I don't think cattle decide to drop a heart while crossing a river in the amazon where discus live. Somehow brine shrimp reproducing in the soft, fresh waters of the amazon seems far fetched to me also. These foods had been tried & proven by folks with many years of experience with fish. Unless someone with experience breeding & raising cons told you this was something to try, I wouldn't do it.
Tolak