Management factors associated with seropositivity to Lawsonia intracellularis in US swine herds

Mark Bronsvoort, Bo Norby, David P. Bane, Ian Gardner

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Objective: To determine risk factors for Lawsonia intracellitlaris seropositivity in the breeding and grower-finisher units of US farrow-to-finish swine herds. Methods: Serum was collected from 15 breeding females and 15 grower-finisher pigs per herd in 184 farrow-to-finish herds, a subset of 405 herds in the National Animal Health Monitoring System (NAHMS) Swine '95 Study that examined management, health, and productivity in herds with at least 300 finisher pigs. Sera were tested by indirect fluorescent antibody test for L intracelliularis. Test results were linked with NAHMS questionnaire data, and a logistic regression model of management factors associated with L intracellularis serological status was developed. Separate models were used for breeding and grower-finisher units. Results: Risk factors for seropositive breeding units were L intracellularis-seropositive status of the grower-finisher unit, use of a continuous system of management for the farrowing unit, and a young parity structure (<75% multiparous sows). Risk factors for seropositive grower-finisher units were L intracellularis-seropositive status of the breeding unit, the number of pigs entering the grower-finisher stage, raising pigs on concrete slats, and intensive management compared with raising pigs on outdoor lots. Implications: Use of all in-all out management in the farrowing house and an older parity structure in the sow herd were associated with a lower risk of L intracellularis seropositivity in the breeding unit, and slatted concrete flooring in grower-finisher houses was associated with a greater risk. Alteration of these management factors might improve control of L intracellularis infection in farrow-to-finish herds.

Original languageEnglish (US)
Pages (from-to)285-290
Number of pages6
JournalJournal of Swine Health and Production
Volume9
Issue number6
StatePublished - Dec 1 2001

Fingerprint

Lawsonia Bacteria
Lawsonia intracellularis
seroprevalence
Swine
Breeding
farrowing
herds
swine
growers
breeding
feeder pigs
risk factors
parity (reproduction)
Parity
sows
Lawsonia (bacteria)
Health
Logistic Models
continuous systems
Serum

Keywords

  • Indirect fluorescent antibody test
  • Lawsonia intracellularis
  • Porcine proliferative enteropathy
  • Risk factors
  • Swine

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

Cite this

Management factors associated with seropositivity to Lawsonia intracellularis in US swine herds. / Bronsvoort, Mark; Norby, Bo; Bane, David P.; Gardner, Ian.

In: Journal of Swine Health and Production, Vol. 9, No. 6, 01.12.2001, p. 285-290.

Research output: Contribution to journalArticle

@article{a379a4cf36b4442d9060f30c8f388e0f,
title = "Management factors associated with seropositivity to Lawsonia intracellularis in US swine herds",
abstract = "Objective: To determine risk factors for Lawsonia intracellitlaris seropositivity in the breeding and grower-finisher units of US farrow-to-finish swine herds. Methods: Serum was collected from 15 breeding females and 15 grower-finisher pigs per herd in 184 farrow-to-finish herds, a subset of 405 herds in the National Animal Health Monitoring System (NAHMS) Swine '95 Study that examined management, health, and productivity in herds with at least 300 finisher pigs. Sera were tested by indirect fluorescent antibody test for L intracelliularis. Test results were linked with NAHMS questionnaire data, and a logistic regression model of management factors associated with L intracellularis serological status was developed. Separate models were used for breeding and grower-finisher units. Results: Risk factors for seropositive breeding units were L intracellularis-seropositive status of the grower-finisher unit, use of a continuous system of management for the farrowing unit, and a young parity structure (<75{\%} multiparous sows). Risk factors for seropositive grower-finisher units were L intracellularis-seropositive status of the breeding unit, the number of pigs entering the grower-finisher stage, raising pigs on concrete slats, and intensive management compared with raising pigs on outdoor lots. Implications: Use of all in-all out management in the farrowing house and an older parity structure in the sow herd were associated with a lower risk of L intracellularis seropositivity in the breeding unit, and slatted concrete flooring in grower-finisher houses was associated with a greater risk. Alteration of these management factors might improve control of L intracellularis infection in farrow-to-finish herds.",
keywords = "Indirect fluorescent antibody test, Lawsonia intracellularis, Porcine proliferative enteropathy, Risk factors, Swine",
author = "Mark Bronsvoort and Bo Norby and Bane, {David P.} and Ian Gardner",
year = "2001",
month = "12",
day = "1",
language = "English (US)",
volume = "9",
pages = "285--290",
journal = "Journal of Swine Health and Production",
issn = "1537-209X",
publisher = "American Association of Swine Veterinarians",
number = "6",

}

TY - JOUR

T1 - Management factors associated with seropositivity to Lawsonia intracellularis in US swine herds

AU - Bronsvoort, Mark

AU - Norby, Bo

AU - Bane, David P.

AU - Gardner, Ian

PY - 2001/12/1

Y1 - 2001/12/1

N2 - Objective: To determine risk factors for Lawsonia intracellitlaris seropositivity in the breeding and grower-finisher units of US farrow-to-finish swine herds. Methods: Serum was collected from 15 breeding females and 15 grower-finisher pigs per herd in 184 farrow-to-finish herds, a subset of 405 herds in the National Animal Health Monitoring System (NAHMS) Swine '95 Study that examined management, health, and productivity in herds with at least 300 finisher pigs. Sera were tested by indirect fluorescent antibody test for L intracelliularis. Test results were linked with NAHMS questionnaire data, and a logistic regression model of management factors associated with L intracellularis serological status was developed. Separate models were used for breeding and grower-finisher units. Results: Risk factors for seropositive breeding units were L intracellularis-seropositive status of the grower-finisher unit, use of a continuous system of management for the farrowing unit, and a young parity structure (<75% multiparous sows). Risk factors for seropositive grower-finisher units were L intracellularis-seropositive status of the breeding unit, the number of pigs entering the grower-finisher stage, raising pigs on concrete slats, and intensive management compared with raising pigs on outdoor lots. Implications: Use of all in-all out management in the farrowing house and an older parity structure in the sow herd were associated with a lower risk of L intracellularis seropositivity in the breeding unit, and slatted concrete flooring in grower-finisher houses was associated with a greater risk. Alteration of these management factors might improve control of L intracellularis infection in farrow-to-finish herds.

AB - Objective: To determine risk factors for Lawsonia intracellitlaris seropositivity in the breeding and grower-finisher units of US farrow-to-finish swine herds. Methods: Serum was collected from 15 breeding females and 15 grower-finisher pigs per herd in 184 farrow-to-finish herds, a subset of 405 herds in the National Animal Health Monitoring System (NAHMS) Swine '95 Study that examined management, health, and productivity in herds with at least 300 finisher pigs. Sera were tested by indirect fluorescent antibody test for L intracelliularis. Test results were linked with NAHMS questionnaire data, and a logistic regression model of management factors associated with L intracellularis serological status was developed. Separate models were used for breeding and grower-finisher units. Results: Risk factors for seropositive breeding units were L intracellularis-seropositive status of the grower-finisher unit, use of a continuous system of management for the farrowing unit, and a young parity structure (<75% multiparous sows). Risk factors for seropositive grower-finisher units were L intracellularis-seropositive status of the breeding unit, the number of pigs entering the grower-finisher stage, raising pigs on concrete slats, and intensive management compared with raising pigs on outdoor lots. Implications: Use of all in-all out management in the farrowing house and an older parity structure in the sow herd were associated with a lower risk of L intracellularis seropositivity in the breeding unit, and slatted concrete flooring in grower-finisher houses was associated with a greater risk. Alteration of these management factors might improve control of L intracellularis infection in farrow-to-finish herds.

KW - Indirect fluorescent antibody test

KW - Lawsonia intracellularis

KW - Porcine proliferative enteropathy

KW - Risk factors

KW - Swine

UR - http://www.scopus.com/inward/record.url?scp=0012982266&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0012982266&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0012982266

VL - 9

SP - 285

EP - 290

JO - Journal of Swine Health and Production

JF - Journal of Swine Health and Production

SN - 1537-209X

IS - 6

ER -