USA – 4th quarter of 2003 (186 farms)
Measurement	Mean	Upper 10%	Lower 10%
Average parity	2.64	3.6	1.5
Percent multiple matings	86.46	99.5	73.8
Percent repeat services	13.94	7.3	21.3
Ave non-productive sow days	71.56	46.5	102.1
Ave parity of culled sows	3.95	5.8	2.2
Ave parity of farrowed sows	3.5	4.2	2.8
Average age at weaning	18	15.2	20.7
Average female inventory	1142.33	2719.6	182.7
Average gestation length	115.29	114	116
Average gilt pool inventory	51.84	139.9	0
Average mummies per litter	0.23	0.1	0.4
Average pigs born alive/litter	10.27	11	9.6
Average stillborn pigs	0.92	0.6	1.2
Average total pigs per litter	11.42	12.3	10.6
Culling rate	41.22	21.6	60.2
Death rate	7.73	3.4	12.8
Entry - 1st service interval	28.13	68.8	0
Farrowing interval	148.77	141	158
Farrowing rate	75.45	84.7	65
Litters / female / year	2.23	2.41	1.98
Litters / mated female / year	2.34	2.51	2.13
Old lits / mated female / year	2.22	2.47	1.93
Old pigs wnd / Inv. female / y	19.48	22.6	15.9
Percent less than 7 born live	12.43	16.9	8.1
Percent sows bred by 7 days	84.49	93.7	73.2
Pigs weaned / lifetime female	32.88	47	17
Pigs weaned per litter weaned	9.04	9.9	8.3
Pigs weaned per sow	8.91	9.7	8.1
Pigs wnd / female / year	19.32	22.5	16.2
Pigs wnd / mated female / yr	20.31	23.3	17.2
PWM for farrowed and weaned	13.35	9	17.6
Replacement rate	80.52	29.1	89.1
Weaning - 1st service interval	7.69	5.6	10.2