Fattening Pig Farms
Based on the set of 16 potential explanatory factors, the study sample of farms was representative of the entire LEI FADN sample of fattening pig farms (data not shown). From the 69 different fattening pig farms, 28 participated in 1 yr and 41 participated in 2 or more years of the study period. The numbers of farms per year were 41 in 2004, 35 in 2005, 29 in 2006, and 46 in 2007. The total number of records (151 fattening pig farm-year combinations) included 80 specialized fattening pig farm-years, 54 farrow-to-finish farm-years (only fattening pigs were considered), and 17 mixed farm-years. Table 2 presents the average number of daily dosages per pig year at the fattening pig farms (NDD1), both for the entire study period and per year. The overall average NDD1 was 14.9, increasing from 11.0 in 2004 to 17.8 in 2006 and 17.6 in 2007. The number of daily dosages varied highly between farms, from zero to a maximum of 53 per average fattening pig present. The Lorentz curve for NDD1 is represented in Figure 1. The curve showed to be concave, with about 10% of the farms being responsible for 30% of the antibiotics dosages.
Fattening Pig Farms
Based on the set of 16 potential explanatory factors, the study sample of farms was representative of the entire LEI FADN sample of fattening pig farms (data not shown). From the 69 different fattening pig farms, 28 participated in 1 yr and 41 participated in 2 or more years of the study period. The numbers of farms per year were 41 in 2004, 35 in 2005, 29 in 2006, and 46 in 2007. The total number of records (151 fattening pig farm-year combinations) included 80 specialized fattening pig farm-years, 54 farrow-to-finish farm-years (only fattening pigs were considered), and 17 mixed farm-years. Table 2 presents the average number of daily dosages per pig year at the fattening pig farms (NDD1), both for the entire study period and per year. The overall average NDD1 was 14.9, increasing from 11.0 in 2004 to 17.8 in 2006 and 17.6 in 2007. The number of daily dosages varied highly between farms, from zero to a maximum of 53 per average fattening pig present. The Lorentz curve for NDD1 is represented in Figure 1. The curve showed to be concave, with about 10% of the farms being responsible for 30% of the antibiotics dosages.
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