Ok so I've done two years so far of detailed tracking of side by side Bengal habitats in franchise mode, so not a controlled test but more a real world one. One thing I'm noticing is one big reason for large variations in feeding costs is how often they get fed. My data set is small obviously, but during this two year test I noticed that one habitat was fed twice both years, while the other was fed twice the first year but only once the second year, despite the animal count not changing between the two years. And it wasn't that keepers didn't visit, they did. In fact just as the year was coming to an end I made sure to call a keeper manually and they decided not to feed. So that alone accounts for a 50% swing in food costs for that habitat year over year due to irregular feeding. Multiply that by other habitats in a zoo and I can see why large swings of 30-50% are seen.
Also as a side note, not that Frontier will probably see this, but doing this testing and watching my keepers like a hawk, really makes me wish the fundamental system for managing staff was different/better. For example instead of setting a frequency of visits to habitats, I'd much rather be able to make out an actual schedule of when the habitat will be fed, cleaned, and repaired. IE Set this habitat to be Fed in February and September, Cleaned in March and December, and Repaired in July each year. Or something like that. Just one more example of how this is light on the management options.
When looking at Food Quality in the Habitat window, Grade 1 food is listed as "$349.88 per feed". This is clearly misleading as my numbers show it actually means "per kg" and even then its a bit off. Best I can tell its $360.78 per kilogram in this case.
Anyway. Data. This is from the initial two years of detailed notes.
Year 69 (First year of detailed tracking)
Bengal Tigers: $18,760.66 (Total of 52kg of food, or $360.78 per kg)
Animals: Habitat Tab: 9, 4 in Trade Center. 2 Adults, 3 Juvenile in Habitat
Food Contents: Blood Pumpkin, Restraint Feeder, Food Tray Large
February Feeding
Blood Pumpkin: 10/10kg
Food Tray Large: 16/20kg
+2 Months:
Blood Pumpkin: 2/10kg Left
Food Tray Large: 6/20kg Left
No Hungry Animals
Keeper cleaned left overs out in June/July
October Feeding
Blood Pumpkin: 10/10kg
Food Tray Large: 16/20kg
+2 Months:
Blood Pumpkin: 3/10kg Left
Food Tray Large: 6/20kg Left
No Hungry Animals
Keeper cleaned left overs in February Year 70
Bengal Breeding: $11,760.98 (Total of 20kg known, estimated ~32kg total, or 360.78 per kg)
Animals: Habitat Tab: 6, 3 in Trade Center. 2 Adults, 1 Juvenile in Habitat
Food Contents: Blood Pumpkin
Late March/ Early April Feeding
Blood Pumpkin: 10/10kg
Piles: 1 (est 6kg per pile)
+2 Months:
Blood Pumpkin: 2/10kg Left
Piles: 0
No Hungry Animals
June Feeding
Blood Pumpkin: 10/10kg
Piles: 1 (est 6kg per pile)
+2 Months:
Blood Pumpkin: 3/10kg Left
Piles: 0.5
Keeper cleaned leftovers out in Sep
July: Juvenile matured. Now just 2 Adults in Habitat
Year 70
Bengal Tigers: $9,380.33 (Total of 26kg, or 360.78 per kg)
Animals: Habitat Tab: 9, 4 in Trade Center. 2 Adults, 3 Juvenile in Habitat
Food Contents: Blood Pumpkin, Restraint Feeder, Food Tray Large
June Feeding
Blood Pumpkin: 10/10kg
Food Tray Large: 16/20kg
+2 Months:
Blood Pumpkin: 3/10kg Left
Food Tray Large: 5/20kg Left
No Hungry Animals
Keeper cleaned left overs in October
Bengal Breeding: $10,010.22 (Total of 20kg known, estimated ~26kgs total, or 385 per kg)
Animals: Habitat Tab: 6, 4 in Trade Center. 2 Adults
Food Contents: Blood Pumpkin
February: Female expecting
March Feeding
Blood Pumpkin: 10/10kg
+2 Months:
Blood Pumpkin: 1/10kg Left
Keeper cleaned leftovers out in July
May: 1 Birth. Now 2 Adults, 1 Juvenile in Habitat
November Feeding
Blood Pumpkin: 10/10kg
Piles: 1 (est 6kg per pile)