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Table 1 Summary of several productive parametres before and during PRRS outbreaks caused by the strain of enhanced virulence

From: Introduction of a PRRSV-1 strain of increased virulence in a pig production structure in Spain: virus evolution and impact on production

 

Before the outbreak

During the outbreak

Weeks to baseline

 

FARM M2

Abortion rate

Average: 1.0%

Median: 0.7%

Average: 28.7% (+ 27.7)****

Median: 29.2% (+ 28.5)

Peak: 71.0%

17

Stillbirths

Average: 6.8%

Median: 5.7%

Average: 9.4% (+ 2.6)*

Median: 8.4% (+ 2.7)

Peak: 27.0%

17

Mummies

Average: 0.6%

Median: 0.7%

Average: 1.8% (+ 1.2) (n.s)

Median: 1.7% (+ 1.0)

Peak: 9.6%

16

Fertile sow mortality rate

Average: 1.0%

Median: 0.8%

Average: 6.5% ( +)***

Median: 4.8% ( +)

Peak: 25.0%

39

Suckling piglet mortality

Average: 10.9%

Median: 7.9%

Average: 7.3% (-2.6) (n.s.)

Median: 6.3% (-1.6)

Peak: 10.6%

0

 

FARM M7

Abortion rate

Average: 1.5%

Median: 1.4%

Average: 11.1% (+ 9.6)****

Median: 9.5% (+ 8.1)

Peak: 35.4%

42

Stillbirths

Average: 8.3%

Median: 8.0%

Average: 13.0% (+ 4.7)*

Median: 13.2% (+ 5.2)

Peak: 16.7%

37

Mummies

Average: 2.9%

Median: 2.8%

Average: 6.8% (+ 3.9)**

Median: 4.6% (+ 1.8)

Peak: 28.5%

40

Fertile sow mortality rate

Average: 1.2%

Median: 1.3%

Average: 3.7% (+ 2.5) p = 0.1

Median: 3.2% (+ 1.9)

Peak: 7.9%

11

Suckling piglet mortality

Average: 13.5%

Median: 12.8%

Average:15.0% (+ 1.5)***

Median: 16.7% (+ 3.9)

Peak: 31.3%

Not yet reached after 42 weeks

 

FARM Nu4

Abortion rate

Average: 0.7%

Median: 0.7%

Average: 5.9% (+ 5.2)****

Median: 5.6% (+ 4.9)

Peak: 10.4%

12

Stillbirths

Average: 1.6%

Median: 1.2%

Average: 10.7% (+ 4.7)****

Median: 10.8% (+ 5.2)

Peak: 37.1%

Not reached yet after 39 weeks

Mummies

Average: 1.7%

Median: 1.7%

Average: 2.6% (+ 0.9)**

Median: 2.4% (+ 0.7)

Peak: 11.5%

Not reached yet after 39 weeks

Fertile sow mortality rate

Average: 0.7%

Median: 0.7%

Average: 2.5% (+ 1.8)**

Median: 2.1% (+ 1.4)

Peak: 5.2%

39

Suckling piglet mortality

Average: 12.2%

Median: 12.6%

Average: 16.1% (+ 3.9)****

Median: 15.6% (+ 3.0)

Peak: 38.3%

Not reached yet after 39 weeks

  1. The table shows the main indicators for the farrowing units before and during the outbreak and the time needed to recover the baseline values. Statistical significance (Mann–Whitney): *p < 0.05; **p < 0.01; ***p < 0.001; ****p < 0.0001; n.s. = non significant