MATERIALS AND METHODS
Animals were treated with antibiotics according to daily practice in the Netherlands, under supervision of the local veterinarian.
Data Collection
Data were collected from farms in the Netherlands in the course of the European Farm Accountancy Data Network (FADN; http://ec.europa.eu/agriculture/). The Agricultural Economics Research Institute (LEI; The Hague, the Netherlands) collected and stored these data in the central LEI FADN database. The LEI FADN included a representative sample of approximately 1,500 agricultural and horticultural commercial farms in the Netherlands. To keep the sample representative, 10% of the sample farms were replaced yearly. Farms that contributed to FADN provided information on many different economic and technical factors on a voluntary basis. Most of the factors were derived from farm accounts. Since 2004, detailed data on animal medication has been collected from part of the LEI FADN pig farms. This study used data from the latter LEI FADN pig farms that participated in the medicinal data collection from 2004 to 2007 (study sample). For these 4 yr, full data records were available. The study sample of the LEI FADN pig farms included 69 different farms and 151 farm-year records for fattening pig farms, and 63 different farms and 155 farm-year records for sow farms. A gross list of technical and economic factors that were potentially related to the use of antibiotics, based on biology/physiology, was subtracted from the LEI FADN database and stored into an Excel (Microsoft Corporation, Redmond, WA) datasheet. This gross list included 53 and 54 factors for the fattening pig and sow farms, respectively. In the gross lists, factors were present that were derived or calculated from 1 or more other factors in the particular lists. From these factors that were, by definition, related to each other, 1 factor was chosen. This resulted in a set of 16 and 19 potential explanatory factors for the fattening pig and sow farms, respectively (Table 1). The average, as well as the confidence intervals, were calculated for the values obtained for each of the factors individually. This was done for fattening pig and sow farms separately, using the corresponding study sample of LEI FADN farms and the total number of LEI FADN pig farms. The obtained average values with confidence intervals were compared between the study sample and the total sample of LEI FADN farms. In this way, the representativeness of the subsample used in this study was evaluated.
วัสดุและวิธีการสัตว์ได้รับการรักษา ด้วยยาปฏิชีวนะตามปฏิบัติประจำวันในประเทศเนเธอร์แลนด์ ภายใต้การดูแลของสัตวแพทย์ท้องถิ่นรวบรวมข้อมูลData were collected from farms in the Netherlands in the course of the European Farm Accountancy Data Network (FADN; http://ec.europa.eu/agriculture/). The Agricultural Economics Research Institute (LEI; The Hague, the Netherlands) collected and stored these data in the central LEI FADN database. The LEI FADN included a representative sample of approximately 1,500 agricultural and horticultural commercial farms in the Netherlands. To keep the sample representative, 10% of the sample farms were replaced yearly. Farms that contributed to FADN provided information on many different economic and technical factors on a voluntary basis. Most of the factors were derived from farm accounts. Since 2004, detailed data on animal medication has been collected from part of the LEI FADN pig farms. This study used data from the latter LEI FADN pig farms that participated in the medicinal data collection from 2004 to 2007 (study sample). For these 4 yr, full data records were available. The study sample of the LEI FADN pig farms included 69 different farms and 151 farm-year records for fattening pig farms, and 63 different farms and 155 farm-year records for sow farms. A gross list of technical and economic factors that were potentially related to the use of antibiotics, based on biology/physiology, was subtracted from the LEI FADN database and stored into an Excel (Microsoft Corporation, Redmond, WA) datasheet. This gross list included 53 and 54 factors for the fattening pig and sow farms, respectively. In the gross lists, factors were present that were derived or calculated from 1 or more other factors in the particular lists. From these factors that were, by definition, related to each other, 1 factor was chosen. This resulted in a set of 16 and 19 potential explanatory factors for the fattening pig and sow farms, respectively (Table 1). The average, as well as the confidence intervals, were calculated for the values obtained for each of the factors individually. This was done for fattening pig and sow farms separately, using the corresponding study sample of LEI FADN farms and the total number of LEI FADN pig farms. The obtained average values with confidence intervals were compared between the study sample and the total sample of LEI FADN farms. In this way, the representativeness of the subsample used in this study was evaluated.
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MATERIALS AND METHODS
Animals were treated with antibiotics according to daily practice in the Netherlands, under supervision of the local veterinarian.
Data Collection
Data were collected from farms in the Netherlands in the course of the European Farm Accountancy Data Network (FADN; http://ec.europa.eu/agriculture/). The Agricultural Economics Research Institute (LEI; The Hague, the Netherlands) collected and stored these data in the central LEI FADN database. The LEI FADN included a representative sample of approximately 1,500 agricultural and horticultural commercial farms in the Netherlands. To keep the sample representative, 10% of the sample farms were replaced yearly. Farms that contributed to FADN provided information on many different economic and technical factors on a voluntary basis. Most of the factors were derived from farm accounts. Since 2004, detailed data on animal medication has been collected from part of the LEI FADN pig farms. This study used data from the latter LEI FADN pig farms that participated in the medicinal data collection from 2004 to 2007 (study sample). For these 4 yr, full data records were available. The study sample of the LEI FADN pig farms included 69 different farms and 151 farm-year records for fattening pig farms, and 63 different farms and 155 farm-year records for sow farms. A gross list of technical and economic factors that were potentially related to the use of antibiotics, based on biology/physiology, was subtracted from the LEI FADN database and stored into an Excel (Microsoft Corporation, Redmond, WA) datasheet. This gross list included 53 and 54 factors for the fattening pig and sow farms, respectively. In the gross lists, factors were present that were derived or calculated from 1 or more other factors in the particular lists. From these factors that were, by definition, related to each other, 1 factor was chosen. This resulted in a set of 16 and 19 potential explanatory factors for the fattening pig and sow farms, respectively (Table 1). The average, as well as the confidence intervals, were calculated for the values obtained for each of the factors individually. This was done for fattening pig and sow farms separately, using the corresponding study sample of LEI FADN farms and the total number of LEI FADN pig farms. The obtained average values with confidence intervals were compared between the study sample and the total sample of LEI FADN farms. In this way, the representativeness of the subsample used in this study was evaluated.
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