Relative to production, the consumption increased to 54.6 mg/kg pork produced or 4.9 ADDkg/kg pork produced, which is high compared to consumption in poultry, but low compared to consumption in aquaculture.
Number of heads produced (slaughtered or exported) increased by 2%, while the production decreased by 4% measured in kg meat produced, i.e. slaughtered in Denmark. This apparent divergence is mainly due to an increasing number of pigs exported around 30 kg, involving 24% of pigs produced in 2009. As a consequence, measuring antimicrobial use against kg-pork-produced tends to overestimate the increase in treatment frequency, while measuring consumption against number of pigs produced tends to underestimate the treatment incidence. Taking into account the export of 30 kg pigs; the adjustment is based on the assumption that pigs exported at 30 kg compared to those not exported, on average received the same amount of antimicrobial agents before export, as other pigs from farrowing to 30 kg.This measure appears to be more stable (independent of changes in trade pattern), and a more reliable measure of trends in antimicrobial consumption per pig. The antimicrobial use per pig produced increased in 2009 by 9.7% compared with 2008 and 33% compared with 2001, ignoring the changes in production with increasing export at 30 kg. Using the adjusted total, the consumption in pigs increased 12.7% per pig produced in 2009, compared with 2008, and 45% compared with 2001. Relative to meat production, the increase in 2009 was 17% compared with 2008, and 53% compared with 2001. During 2001–2009, the consumption increased in all age groups, but more in finishers (by 71%), and less in weaning pigs (by 34%) and sow herds (by 55%) .
The increasing consumption in 2009 could largely be attributed to tetracyclines, macrolides andpleuromutilins, which continued to be the most commonly used antimicrobial agents in pigs.