Comment from the RAC
"APHIS-Core is one of the most challenging PGA Message Sets for brokers. Up until now, most brokers were not part of the APHIS-Core related information flow, since APHIS-Core documents were in paper form and passed on to CBP-Ag by the carrier. Adding to the complexity, many of the data elements are unfamiliar to brokers - such as the genus and species. So, it is tough, but stay with it. It will eventually make sense."