This is completely 100% from memory, so is probably utterly wrong
Pigs in the lowerdeck is a definite no-no as the temperature range for pigs is limited and the required ventilation flow is considerable. Given that there is a lot of air re-circulated means that the humans upstairs end up sharing the recirculated air with the pigs, who then write rude letters in to the airline to complain about the smell.
Sorry that doesn't quite read right
We used to carry lots of pigs on the 74M upstairs but I'm not sure if that is still permitted.
Wouldn't have thought that you would be that far from a major hub airport in Europe ???