I've had powdered milk and beef jerky taken from me by a sniffing dog at the airport in New Zealand, and had beef jerky from home taken from my bag by the TSA.
You didn't say what countries you are going to, which makes a difference, but try these websites:
http://www.iatatravelcentre.com/PE-Peru ... htm#Import regulations
Peru seems to be okay, Argentina and Brasil who are more famous for beef say no.
Lonely planet boards are sometimes a good source of info as well.
https://www.lonelyplanet.com/thorntree/ ... d-products