Implementation and evaluation of different eradication strategies for Brachyspira hyodysenteriae

Table 2 Measures taken in the 10 farms that participated in the Brachyspira hyodysenteriae eradication programme

	Farm number
	1	2	3	4	5	6	7	8	9	10
Type of farm^a	gilt rearing	FTF	sow	fattening	FTF	fattening	sow	sow	fattening	fattening
Eradication programme
Start during the year^b	M-J	M-J	J-A	M-J	J-A	A-M	J-A	S-O	S-O	S-O
Depopulation of animals	partial	total	none	total	None	partial	partial	partial	partial	partial
Min. vacancy (d) of rooms during eradication	28	21 (nursery); 42 (other)	3 (nursery); 10 (sows)	56	3 (fattening)	14	10	21	14	21
Antimicrobial medication	no	no	yes	no	yes (except old fattening pigs)	no	yes	yes	no	no
Duration of medication (days)	NA^c	NA	30	NA	30	NA	30	42	NA	NA
Antimicrobial^d			Tiamulin		Tiamulin		Tiamu-lin^e	Tiamulin 28d, lincomycin 14d
External biosecurity
Purchase of animals (age in weeks)	yes (10)	yes (30)	no	yes (10)	No	yes (10)	no	no	yes (10)	yes (10)
Temporary stop of animal purchase	yes	yes	NA	yes	NA	yes	NA	NA	yes	yes
Change of origin farm after programme	yes	no	NA	no	NA	no	NA	NA	no	no
Internal biosecurity
Emptying and cleaning manure pits	yes	yes	yes	yes	no	yes	yes	yes	yes	yes
Strict / successful rodent control	yes	yes	no	yes	no	yes	yes	yes	yes	no
Proper cleaning and disinfection	yes	yes	yes	yes	no	yes	yes	yes	yes	yes
Disinfection baths at entry of each barn	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
Separate equipment for each age group	yes	yes	yes	yes	no	yes	yes	yes	no	no
Separate boots for each age group	yes	yes	no	yes	no	yes	yes	yes	no	no
Eradication successful	yes	yes	no	yes	no	no	no	yes	no	no

^a Gilt rearing: from 10 weeks until pregnancy testing; FTF farrow-to-finish; sow farm: pigs raised until 10 weeks of age
^b Months: A-M April–May; M-J May–June; J-A July–August; S-O September–October
^c NA Not applicable
^d Via feed medication: tiamulin 8–10 mg/ kg BW; lincomycin 15 mg/kg BW
^e For 6 months after the programme, breeding gilts prior to insemination were treated with tylvalosin (5 mg/kg BW) via the feed

ISSN: 2055-5660