I dont consider it odd in the least to hear of a python that only eats once or twice a year. If the meals are large enough, I would expect that that python could be perfectly healthy. I'm clearly no expert, but I do find it odd to hear of a zoo that only offers food once or twice a year as a standard husbandry for pythons. Your adults that eat 5-6 times a year eat 2.5 to 6 times more frequently than they feed theirs.
1 adult bull snake: "Dozer"; 1.1 juvenile bull snakes: Oscar and Phoebe; 3 baby red-sided garters; 1.1 macklot's pythons