Impact of a killed PRRSV vaccine on sow longevity in a PRRSV infected swine herd

Figures & data

Table 1. Results of routine mycotoxicological analysis in feed raw materials.

	Mycotoxins
	Aflatoxines (B1, B2, G1, G2)	Deoxynivalenol (DON)	Acetyl-DON	Nivalenol	Zearalenone (ZEN)
Levels (µg/kg)	<22	<250	<250	<250	<50

Table 2. Percentage of infected non-vaccinated animals (PRRSV-specific antibody titres >1:40) per semester prior and after the start of vaccination.

	Age
Semesters	Weaners (9 weeks of age)	Growers (16 weeks of age)	Finishers (23 weeks of age)	Gilts (24–260 weeks of age)	Sows (parity 1–6)
−1	1/10 (10.0%^a,d)	9/10 (90.0%^a)	10/10 (100.0%^a)	10/10 (100.0%^a)	14/19 (73.7%)
+1	15/15 (100.0%^b)	15/15 (93.3%^a)	15/15 (100.0%^a)	20/20 (100.0%^a)
+2	0/15 (0.0%^a)	4/15 (26.7%^b)	15/15 (100.0%^a)	14/15 (93.3%^a)
+3	9/15 (60.0%^c)	12/15 (80.0%^a)	19/20 (95.0%^a)	19/20 (95.0%^a)
+4	7/15 (46.7%^c,d)	4/15 (26.7%^b)	15/15 (100.0%^a)	15/15 (100.0%^a)
Note: Number of seropositive samples/total number of samples (%).
Percentages in the same column with different superscripts differ (P ≤ 0.05).

Figure 1.  Percentage of PRRSV – infected non-vaccinated animals (PRRSV-specific antibody titres >1:40) per semester prior and after the start of vaccinations.

Figure 2.  Distribution of serological results based on PRRSV-specific antibody titres per semester in gilts prior and after the start of vaccinations (–1, +1, +2, +3, +4).

Table 3. Culling rate of female breeding stock (sows/gilts) per semester and totally prior and after the start of vaccination.

	Period relative the start of vaccination
	Two semesters prior (−2)	One semester prior (−1)	One semester after (+1)	Two semesters after (+2)	Three semesters after (+3)
Number of culled females/number of females mated	260/1089	286/1142	260/1135	237/1139	235/1116
Culling rate (%)	23.9^ab	25.0^a	22.9^ab	20.8^b	21.1^b
	1 year prior		1.5 year after
Number of culled females/number of females mated	546/2231		732/3390
Culling rate (%)	24.5^a		21.9^b
Percentages in a row with different superscripts differ (P ≤ 0.05).

Table 4. Causes of culling in female breeding stock (sows/gilts) per semester and totally prior and after the start of vaccination.

Causes	Period relative the start of vaccination
	Two semesters prior (−2)	One semester prior (−1)	One semester after (+1)	Two semesters after (+2)	Three semesters after (+3)
Reproductive failure	106/260 (40.8%^a)	115/286 (40.2%^a)	82/260 (31.5%^b)	61/237 (25.7%^bd)	52/235 (22.2%^cd)
Deaths	35/260 (13.5%^a)	40/286 (14.0%^a)	29/260 (11.2%^a)	23/237 (9.7%^a)	24/235 (10.3%^a)
Old age	38/260 (14.6%^b)	43/286 (15.0%^b)	79/260 (30.4%^a)	81/237 (34.2%^a)	88/235 (37.6%^a)
Locomotor problems	49/260 (18.8%^a)	52/286 (18.2%^a)	41/260 (15.8%^a)	39/237 (16.5%^a)	39/235 (16.7%^a)
Other	32/260 (12.3%^a)	36/286 (12.6%^a)	29/260 (11.2%^a)	33/237 (13.9%^a)	31/235 (13.2%^a)
	1 year prior		1.5 year after
Reproductive failure	221/546 (40.5%^a)		195/732 (26.6%^b)
Deaths	75/546 (13.7%^a)		76/732 (10.4%^a)
Old age	81/546 (14.8%^a)		248/732 (33.9%^b)
Locomotor problems	68/546 (12.5%^a)		93/732 (12.7%^a)
Other	101/546 (18.5%^a)		119/732 (16.3%^a)
Number of cases/number of females mated (%).
Percentages in a row with different superscripts differ (P ≤ 0.05).