USA - 2003 Annual (199 farms)
Measurement	Mean	Upper 10%	Lower 10%
Average parity	2.64	3.7	1.5
Percent multiple matings	83.41	99.5	66.7
Percent repeat services	13.99	6.6	22.7
Ave non-productive sow days	74.04	47	103.5
Ave parity of culled sows	3.95	5.8	2.2
Ave parity of farrowed sows	3.49	4.3	2.7
Average age at weaning	18.15	21.1	15.2
Average female inventory	1095.21	2714.9	168
Average gestation length	115.27	116	114
Average gilt pool inventory	49.65	124.7	0
Average mummies per litter	0.22	0.1	0.4
Average pigs born alive/litter	10.25	11.1	9.5
Average stillborn pigs	0.91	0.5	1.2
Average total pigs per litter	11.39	12.3	10.5
Culling rate	41.17	21.6	60.7
Death rate	7.81	3.2	13.1
Entry - 1st service interval	28.05	68.9	0
Farrowing interval	150.03	160	141
Farrowing rate	75.62	84.8	64.1
Litters / female / year	2.21	2.4	1.94
Litters / mated female / year	2.32	2.51	2.08
Old lits / mated female / year	2.21	2.47	1.91
Old pigs wnd / Inv. female / y	19.29	22.5	15.8
Percent less than 7 born live	12.42	17.5	8.1
Percent sows bred by 7 days	84.19	94.3	73.1
Pigs weaned / lifetime female	32.75	48	17
Pigs weaned per litter weaned	9.02	9.9	8.3
Pigs weaned per sow	8.88	9.7	8.1
Pigs wnd / female / year	19.12	22.5	15.9
Pigs wnd / mated female / yr	20.15	23.3	17
PWM for farrowed and weaned	13.4	8.7	17.7
Replacement rate	79.49	31.1	89.1
Weaning - 1st service interval	7.85	5.6	10.5