Your question is: Could this plotline be geared to young children? Honestly, I would deliver a strong no.
How many books are there for 5-year-olds which involve such a degree of violence including accidental murder of parents and then having a young boy die while being taken to a child meat packing plant?
Unless you make it more lighthearted like how I suggested in comments (making it silly and ironic), as Chris answered - it would not be appropriate for young children and no publisher would publish it.
I also see your comment on Chris' answer:
The reason why is because today's youth aren't really prepared for the outside world. I've heard from one source that 1 in 4 victims of trafficking are children. Obviously, any is one too many, but little kids who barely begun to live? Most traffickers aren't somebody the victim knows. If the librarians, teachers, and parents cared about child safety and didn't want to sugar-coat it, they'd do the book, because things like this happen and are more than real
Don't get me wrong, it's a good idea to educate kids on that and it would probably work for older audiences, but it is a touchy topic that is controversial on how to teach to young children. If I were you, I would consider the following:
If you absolutely need to publish this for young children, you should make it more lighthearted and subtle, because if you end your book with the mc dying while going to a meatpacking factory you will totally terrify your young audience in an unneeded way.
If you care about this topic and decide not to write it for children, you should write a novel for older kids directly addressing it instead of dancing around it with animals and such.
If you do write this book according to point B, you need to do lots of research to make your book as factual as possible.
Does this help?