Table 1. Descriptive data on selected herds (n = 10, A-J) and piglets (n = 69).

Herd	A	B	C	D	E	F	G	H	I	J
Type of production	Satellite	Farrow-to- finish	Piglet production	Piglet production	Satellite	Piglet production	Piglet production	Farrow-to- finish	Satellite	Farrow-to- finish
Sows in production	a	800	600	1100	b	160	500	120	c	250
Sanitation between batches	Washing + disinfection	Washing	Washing + disinfection	Washing	Washing + disinfection	Washing	Washing	Washing	Washing	Washing + disinfection
No of litters sampled	7	5	5	7	7	6	7	7	6	3
Age range of selected of piglets (days)d	1–2	1–6	1–3	<1–3	<1–2	<1–2	<1–3	<1–2	<1–3	<1–1
Sex of selected piglets	3♀, 4♂	3♀, 4♂	4♀, 3♂	7♀, 0♂	4♀, 3♂	5♀, 2♂	5♀, 2♂	5♀, 2♂	4♀, 2♂	5♀, 2♂
Time of visit	Jun+Sept 2011	Oct 2011	Nov 2011	Jan 2012	Feb 2012	Mar 2012	Mar 2012	Apr 2012	Apr 2012	May 2012

^a Farrowing on a weekly basis, 50 or 10 sows alternating every other week

^b Farrowing every two weeks, 44 sows per batch

^c Farrowing every seven or eight weeks, 72 sows per batch

^d Age was registered as <1 day (born the night before the visit), 1 day old (born the day before the visit), etc.