Herd factors associated with the seroprevalences 
of four major respiratory pathogens in slaughter pigs from farrow-to-finish pig herds

Maes, Dominiek; Deluyker, Hubert; Verdonck, Marc; Castryck, Frans; Miry, C; Vrijens, Bernard; Kruif, Aart de

doi:10.1051/vetres:2000122

Cited by 104 publications

(91 citation statements)

References 27 publications

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“…The odds ratios in this study quantify the increased or decreased risk of finding a seropositive pig in a herd when the risk factor is present in this herd. More discussion about the strengths and weaknesses of a cross-sectional study design has been presented in the first paper [17]. Because we used serology as disease parameter, the risk factors are not necessarily the same as those associated with clinical disease or with lung lesions caused by A. pleuropneumoniae.…”

Section: Discussionmentioning

confidence: 99%

“…All these data were contemporary for the pigs that were examined at slaughter. More details about the study population and the different potential risk factors are described in a previous paper [17]. Vaccination against A. pleuropneumoniae was not practised in any of the selected swine farms.…”

Section: Study Population and Herd Factorsmentioning

confidence: 99%

“…Odds ratios and their 95% confidence intervals were calculated from the final logistic regression models. More details about the statistical analyses are explained in a previous paper [17].…”

Section: Statistical Analysesmentioning

confidence: 99%

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Herd factors associated with the seroprevalences of Actinobacillus pleuropneumoniae serovars 2, 3 and 9 in slaughter pigs from farrow-to-finish pig herds

Maes¹,

Chiers

Haesebrouck

et al. 2001

Vet. Res.

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-This cross-sectional epidemiologic study was conducted in 150 randomly selected farrowto-finish pig herds to investigate descriptive epidemiological characteristics of infections with three different serovars of Actinobacillus pleuropneumoniae, and to identify risk factors for the within-herd seroprevalences of these serovars. Different farm characteristics (n = 28) were examined as potential risk factors for the percentage of pigs with antibodies against serovars 2, 3 and 9. The presence of antibodies was measured using an indirect ELISA. Logistic regression analyses were used to assess the associations between the potential risk factors and the proportion of seropositive pigs. The median within-herd seroprevalences were 95% (range: 0-100%), 100% (range: 10-100%), and 35% (range: 0-100%) for serovars 2, 3, and 9, respectively. There was a positive association (P < 0.001) between each of these serovars. The within-herd seroprevalence of serovar 2 was significantly higher in farms that purchased gilts from ≥ 2 origin herds (OR = 2.33; P < 0.05) and in farms with poor biosecurity measures (OR = 4.62; P < 0.05). The proportion of pigs seropositive for serovar 3 was significantly higher when tested pigs were slaughtered in May-August and in November-December (OR = 5.96; P < 0.001), in herds without a growing unit (OR = 2.63; P < 0.01), and in herds with a direct air-entry into the finishing unit (OR = 1.92; P < 0.05). The within-herd seroprevalence of serovar 9 increased significantly in herds with poor biosecurity measures (OR = 1.76; P < 0.05). The study documented that infections with A. pleuropneumoniae serovars 2, 3, and 9 were very common in the selected herds, and that the sero-epidemiological characteristics and risk factors showed some variation depending on the serovar. The purchase policy of gilts and biosecurity measures are risk factors that can be improved fairly easily on pig farms. swine / Actinobacillus pleuropneumoniae / seroprevalence / epidemiology Vet. Res. 32 (2001) 409-419 409

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Section: Discussionmentioning

confidence: 99%

Section: Study Population and Herd Factorsmentioning

confidence: 99%

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Herd factors associated with the seroprevalences of Actinobacillus pleuropneumoniae serovars 2, 3 and 9 in slaughter pigs from farrow-to-finish pig herds

Maes¹,

Chiers

Haesebrouck

et al. 2001

Vet. Res.

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“…It has been suggested that at each origin herd there are specific pathogen sources. Therefore, in a GF batch with multiples origins, there may be a mixture of pathogens and immunity status, increasing the risk of transmission of pathogens and reducing performance (Harris and Alexander, 1999;Maes et al, 2000).…”

Section: Alsomentioning

confidence: 99%

Management factors affecting mortality, feed intake and feed conversion ratio of grow-finishing pigs

Agostini

Fahey

Manzanilla

et al. 2014

Animal

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The aim of this study was to determine the effect of animal management and farm facilities on total feed intake (TFI), feed conversion ratio (FCR) and mortality rate (MORT) of grower-finishing pigs. In total, 310 batches from 244 grower-finishing farms, consisting of 454 855 Pietrain sired pigs in six Spanish pig companies were used. Data collection consisted of a survey on management practices (season of placement, split-sex by pens, number of pig origins, water source in the farm, initial or final BW) and facilities (floor, feeder, ventilation or number of animals placed) during 2008 and 2009. Results indicated that batches of pigs placed between January and March had higher TFI ( P = 0.006), FCR ( P = 0.005) and MORT ( P = 0.03) than those placed between July and September. Moreover, batches of pigs placed between April and June had lower MORT ( P = 0.003) than those placed between January and March. Batches which had split-sex pens had lower TFI ( P = 0.001) and better FCR ( P < 0.001) than those with mixed-sex in pens; pigs fed with a single-space feeder with incorporated drinker also had the lowest TFI ( P < 0.001) and best FCR ( P < 0.001) in comparison to single and multi-space feeders without a drinker. Pigs placed in pens with <50% slatted floors presented an improvement in FCR ( P < 0.05) than pens with 50% or more slatted floors. Batches filled with pigs from multiple origins had higher MORT ( P < 0.001) than those from a single origin. Pigs housed in barns that performed manual ventilation control presented higher MORT ( P < 0.001) in comparison to automatic ventilation. The regression analysis also indicated that pigs which entered to grower-finisher facilities with higher initial BW had lower MORT ( P < 0.05) and finally pigs which were sent to slaughterhouse with a higher final BW presented higher TFI ( P < 0.001). The variables selected for each dependent variable explained 61.9%, 24.8% and 20.4% of the total variability for TFI, FCR and MORT, respectively. This study indicates that farms can increase growth performance and reduce mortality by improving farm facilities and/or modifying management practices.

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“…Pig density is a risk factor for spreading viral diseases: (1) Aujeszky's disease [9,12,19,23], (2) PRRS [1,3], and (3) Influenza [7,14,15,17,18]. However, the specific features of these densely populated areas might explain the increased risk of spread of the above viral agents.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of respiratory disease outbreaks in fattening pigs: Relation with the features of a densely and a sparsely populated pig area in France

Rose¹,

Madec²

2002

Vet. Res.

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-A survey was carried out in France in 1999 in a Densely Populated Pig Area (DPPA) and a Sparsely Populated Pig Area (SPPA) from which 80 and 55 pig farms were respectively investigated. The two areas were compared regarding the number of respiratory disease outbreaks in fattening pigs on each farm per year with a multiple correspondence analysis and hierarchical clustering. The two areas exhibited different typologies: in the DPPA, high density was associated with a high proportion of finishing-pig units resulting in much moving of piglets within the area. Farrow-to-finish farms located in the DPPA had many contacts with external vehicles; this was associated with more than two respiratory disease outbreaks per farm per year. There also was a lack of biosecurity measures implemented on these farms. Conversely, the good health situation of the farms located in the SPPA was associated with few external contacts and good biosecurity measures. In a second step, risk factors for the occurrence of more than 2 respiratory outbreaks per year were studied. Having more than 4 pig farms within a 2 km radius area, more than 30 incoming rendering trucks per year, and storage of the carcasses of dead animals within the farmyard perimeter increased the risk of occurrence of more than 2 respiratory disease outbreaks per year on the farm. This risk was also increased when there were more than 2 animal-transport lorries entering the farm per month and more than 1 veterinarian's or technician's vehicle coming in every 2 months. These results were discussed because of possible bias due to the retrospective design of the survey and the sampling scheme (randomisation within two areas). (33) 296 016 253; e-mail: n.rose@ploufragan.afssa.fr des élevages (nombre d'épisodes de type grippal en engraissement) au moyen d'une analyse factorielle des correspondances multiples suivie d'une classification ascendante hiérarchique. Les deux zones présentaient une typologie différente : en zone FD, la forte densité était associée à un nombre d'élevages plus important de type engraisseur, impliquant une circulation des porcelets plus importante. La forte fréquentation des élevages naisseur-engraisseurs situés dans cette zone par les véhicu-les extérieurs, peut être interprétée en tant que cause ou conséquence d'une situation sanitaire difficile (nombre de syndromes grippaux en engraissement > 2 par an), exacerbée par le manque de précau-tions sanitaires prises par ces mêmes élevages. En zone BD, la bonne situation sanitaire des élevages à l'égard de la pathologie cible, était associée à une faible fréquentation par les véhicules extérieurs et à la mise en place de mesures de biosécurité. Dans un second temps, les facteurs de risque de l'expression clinique de plus de 2 syndromes grippaux par an ont été recherchés. Le modèle de régression logistique a permis de mettre en évidence que la densité d

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Herd factors associated with the seroprevalences of four major respiratory pathogens in slaughter pigs from farrow-to-finish pig herds

Cited by 104 publications

References 27 publications

Herd factors associated with the seroprevalences of Actinobacillus pleuropneumoniae serovars 2, 3 and 9 in slaughter pigs from farrow-to-finish pig herds

Herd factors associated with the seroprevalences of Actinobacillus pleuropneumoniae serovars 2, 3 and 9 in slaughter pigs from farrow-to-finish pig herds

Management factors affecting mortality, feed intake and feed conversion ratio of grow-finishing pigs

Occurrence of respiratory disease outbreaks in fattening pigs: Relation with the features of a densely and a sparsely populated pig area in France

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