Table 1. Annual herd production data for 2011.

Variables	Definition
Average female inventory (AFI)	Includes sows and mated, but not maiden, gilts (numbers were counted monthly; AFI was defined as the mean of the 12-month values)
Total number of marketed pigs (TNMP)a)	Total number of fattening pigs sold (excluding sows and boars sold)
Total number of pigs weaned (TNPW)	Total number of pigs weaned
Total number of pigs mated (TNM)	Total number of pigs mated
Total number of litters (TNL)	Total number of litters (excluding abortions)
Total number of pigs born alive (TNPB)	Total number of pigs born alive at farrowing (excluding stillborn and mummified piglets)
Total number of deaths at postweaning stage (TND)	Total number of deaths (including euthanized) at the post weaning stage

a) For farms using on-site pigs as replacement sows, data adjustments were carried out for TNMP based on the assumption that replacements were sold to the slaughterhouse.