Feed & Feed Conversion
Four figures: how much feed went out, what it cost, the average cost per pound, and the feed conversion ratio. The first three come from feed alone; the fourth needs weights as well, which is why it is the one most likely to be blank — and the dashboard tells you exactly why when it is.
What this answers
- What feed is costing across a period, and per pound.
- How many pounds of feed it took to put on a pound of rabbit.
- Whether either figure is trustworthy yet.
Cost per pound of gain
Total feed is the sum of two things: the pounds on your feed allocations, plus feed drawn down automatically by feed schedules — converted to pounds using the inventory item's pounds-per-unit.
Total cost works the same way: allocation costs, plus automatic draw-downs valued at the item's cost per unit. Average cost per pound is one divided by the other.
Two gaps show up here as missing-data notes rather than silently wrong numbers:
- "Some auto-decrement feed usage has no pounds-per-unit conversion" — an inventory item is consuming stock but OmniBurrow cannot tell how many pounds that is.
- "Auto-decrement feed usage has no cost reference" — same, for money.
Both are fixed by filling in feed weight lb per unit and cost per unit on the inventory item. See Supply Inventory.
Feed conversion ratio
FCR is pounds of feed divided by pounds of gain.
The gain half is measured per target — per rabbit, per litter — as the difference between the first and last weight recorded inside the window. A target only contributes if it has at least two weights and the later one is heavier.
It is almost never because your rabbits converted badly. It is one of these:
- Feed was bought but never allocated. Purchases give you cost; only allocation ties feed to animals. The dashboard says "no feed allocations in period".
- Not enough weights. With fewer than two weights on a target inside the window there is no gain to divide into. The dashboard says "FCR requires at least two weight records for linked feed targets".
- Feed went to a grow-out group with no litter linked. Group allocations are attributed to the group's litter for the gain side, so a group without one contributes feed and no gain. See Grow-Out Groups.
What you must record
- Allocate feed — to a rabbit, a litter, or a grow-out group — with a quantity in pounds and a period. Cost too, if you want the money figures.
- Weigh twice or more inside the period, on whatever you allocated feed to.
- Set pounds per unit and cost per unit on feed inventory items, so schedule draw-downs count properly.
- Link grow-out groups to their litter.
Confidence is high at ten or more feed records in the window, medium at three, low below that.