TY - JOUR
T1 - Establishment of a herd negative for porcine reproductive and respiratory syndrome virus (PRRSV) from PRRSV-positive sources
AU - Torremorell, Montserrat
AU - Moore, Camille
AU - Christianson, William T.
N1 - Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2002
Y1 - 2002
N2 - Objective: To establish a herd negative for porcine reproductive and respiratory syndrome virus (PRRSV) from PRRSV-positive sources by management of the gilt pool and batching of pig flow. Methods: Two groups of PRRSV-positive gilts were housed in common acclimatization areas for 70 to 100 days, bred in an off-site finishing facility, and farrowed in a separate facility. Piglets weaned at 5 to 7 days of age were moved to off-site nurseries in weekly batches and mixed with cohort sentinel piglets from a PRRSV-negative herd. Each nursery batch was tested for PRRSV twice by PCR and once by ELISA. Two to five negative batches were grouped in off-site grower facilities, and tested again. Negative groups moved to a quarantine facility. Negative quarantine groups were used for stocking the PRRSV-negative herd. Results: Of the 31 batches of nursery pigs produced, three batches, born 2, 4, and 6 weeks after farrowings started, were PRRSV-positive. Six grower groups (comprising 23 nursery batches) that were PRRSV-negative after repeated testing were assembled into five groups in a quarantine facility and remained PRRSV-negative. Two grower groups were rejected. A total of 9500 pigs were produced, from which 3415 pigs were selected to stock the PRRSV-negative herd. Implications: A PRRSV-negative population was established from positive sources by managing the gilt pool and batching the pig flow, allowing for preservation of elite genetics. It appeared that PRRSV infection, indicated by lack of seroconversion in the offspring, eventually either disappeared or became inactive in the donor gilt population.
AB - Objective: To establish a herd negative for porcine reproductive and respiratory syndrome virus (PRRSV) from PRRSV-positive sources by management of the gilt pool and batching of pig flow. Methods: Two groups of PRRSV-positive gilts were housed in common acclimatization areas for 70 to 100 days, bred in an off-site finishing facility, and farrowed in a separate facility. Piglets weaned at 5 to 7 days of age were moved to off-site nurseries in weekly batches and mixed with cohort sentinel piglets from a PRRSV-negative herd. Each nursery batch was tested for PRRSV twice by PCR and once by ELISA. Two to five negative batches were grouped in off-site grower facilities, and tested again. Negative groups moved to a quarantine facility. Negative quarantine groups were used for stocking the PRRSV-negative herd. Results: Of the 31 batches of nursery pigs produced, three batches, born 2, 4, and 6 weeks after farrowings started, were PRRSV-positive. Six grower groups (comprising 23 nursery batches) that were PRRSV-negative after repeated testing were assembled into five groups in a quarantine facility and remained PRRSV-negative. Two grower groups were rejected. A total of 9500 pigs were produced, from which 3415 pigs were selected to stock the PRRSV-negative herd. Implications: A PRRSV-negative population was established from positive sources by managing the gilt pool and batching the pig flow, allowing for preservation of elite genetics. It appeared that PRRSV infection, indicated by lack of seroconversion in the offspring, eventually either disappeared or became inactive in the donor gilt population.
KW - False positive
KW - Gilt acclimatization
KW - Porcine reproductive and respiratory syndrome
KW - Porcine reproductive and respiratory syndrome virus eradication
KW - Swine
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M3 - Article
AN - SCOPUS:0036058039
SN - 1537-209X
VL - 10
SP - 153
EP - 160
JO - Journal of Swine Health and Production
JF - Journal of Swine Health and Production
IS - 4
ER -