Sum (BirthWeight * TotalBornsLiveBirth)

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Sum: sum for each birth weight analyzed in the period;

Birth Weight: Average weight of piglets recorded in the analyzed birth;

TotalBornLiveBirth: Total number of piglets born alive in the analyzed birth;

TotalBornsLivePigsPeriod: total number of live  piglets analyzed in the period


1) For the sow, consider the period from the 1st sow farrow to the last sow farrow on a given farm