Weight Gain - (Applied to GROUP)
Exit Average Weight - Entry Average Weight
Weight Gain - (Applied for one-period performance)
(Exit Average Weight - Entry Average Weight) * Qty Exit Piglets
Exit Average Weight: average exit weight per piglet in kg.
Entry Average Weight: average entry weight per piglet in kg.
Qty Exit Piglets: Number of piglets that left the phase in the period (consider phase transfer, sale, self-consumption, donation and internal replacement);