Olanratmanee EO, Thanawongnuwech R, Kunavongkrit A,
Tummaruk P. Reproductive performance of sows with and without PRRS modified
live virus vaccination in PRRS-virus-seropositive herds. Trop Anim Health Prod. 2014 Aug;46(6):1001-7. doi: 10.1007/s11250-014-0606-5. Epub
2014 May 10.
Abstract
Porcine
reproductive and respiratory syndrome (PRRS) virus infection causes
reproductive failures including return to oestrus, abortion, mummified
foetuses, stillborn, and weak-born piglets. The objective of the present study
was to investigate reproductive performance of sows in PRRS-virus-seropositive
herds with and without PRRS modified live virus (PRRS-MLV) vaccination. The
study was conducted in 20 PRRS-virus-seropositive commercial swine herds in
Thailand. The data included 211,009 mating and 180,935 farrowing records. The
analysed variables included farrowing rate (FR), return rate (RR), abortion
rate (AR), total number of piglets born per litter (TB), number of piglets born
alive per litter (BA), percentage of stillborn (SB), percentage of mummified
foetuses (MM), and number of piglets weaned per litter (WP). The results
revealed that FR in non-vaccinated sows was lower than that in vaccinated sows
(85.0 vs 89.7%, respectively, P < 0.001), and RR in non-vaccinated sows was
higher than that in vaccinated sows (6.9 vs 3.7%, respectively, P < 0.001).
AR did not differ significantly between non-vaccinated and vaccinated sows (1.6
and 2.0%, respectively, P = 0.964). TB (11.2 and 11.5, respectively,
P < 0.001), BA (10.0 and 10.6, respectively, P < 0.001), and WP (9.2 and
9.6, respectively, P < 0.001) in non-vaccinated sows were lower than those
in vaccinated sows. SB (6.9 and 5.1%, respectively, P < 0.001) and MM (3.2
and 2.2%, respectively, P < 0.001) in PRRS-MLV-vaccinated sows were higher
than those in non-vaccinated sows. The improvement in sow reproductive
performance in PRRS-MLV-vaccinated herds was most pronounced in gilts and
primiparous sows.
PMID:
24817371 [PubMed - indexed for MEDLINE]
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