Not a very clear pic, but they look like black soldier fly grubs to me - if so, they're fantastic composters! There are industrial scale BSF composting facilities being used all around the globe nowadays, to consume different organic waste streams to make compost and animal feed (grubs).
I'm not a biologist, but I believe due to possibility of disease transmission - that you don't want to raise the BSF on the waste from the same genus of animals you plan to feed the grubs to. This is why I raise my BSF on kitchen scraps instead of chicken poop, since the grubs are for the chickens - and they go CRAZY for the grubs, like fighting one another to get them when I dump them out. If I was not feeding the grubs to my chickens, or if I had carnivorous fish/reptiles/etc then I'd for sure be raising the BSF on chicken poop.
Good luck!