Table 6. The duration and interval of a suckling bout (min ± SD) during the lactating period

Variables	Housing system	Day									Mean	p-value
		1	2	3	4	5	6	7	14	20
Duration	FC	7.9 ± 0.9	7.8 ± 1.5	8.4 ± 0.9	8.6 ± 0.7	7.5 ± 1.2	7.5 ± 0.3	6.9 ± 0.9	9.3 ± 1.3	10.0 ± 1.3	8.2 ± 1.6	ns
	AFP	8.9 ± 1.1	7.9 ± 0.8	7.5 ± 0.8	8.2 ± 0.4	7.9 ± 1.0	7.8 ± 1.2	7.3 ± 0.0	8.6 ± 1.6	8.8 ± 1.8	8.1 ± 1.6
Interval	FC	33.0 ± 2.0	37.7 ± 0.6	39.3 ± 0.6	40.7 ± 1.5	41.7 ± 3.1	36.3 ± 2.1	36.3 ± 3.1	35.7 ± 0.6	33.0 ± 0.0	37.1 ± 3.3	ns
	AFP	37.7 ± 2.5	37.0 ± 2.6	38.3 ± 1.2	40.7 ± 4.7	37.7 ± 2.5	40.3 ± 3.2	38.7 ± 2.5	34.7 ± 7.4	31.7 ± 3.1	37.4 ± 4.1

FC, farrowing crate; AFP, alternative farrowing pen; ns, not significant (p > 0.05).