1998 Breeding Herd Summary- USA
Measurement	Average	Median	Upper 10%	Lower 10%
BREEDING PERFORMANCE
Repeat services, %	14.4	13.8	6.3	22.7
Multiple Matings, %	85.2	91.5	99.6	67.5
Entry-to-service interval, day	37.9	3507	14.7	63.8
Sows bred by seven days, %	83.2	86.1	93.7	71.3
Weaning-to-first-service interval	8.2	7.4	5.7	11.8
Average nonproductive days	85.8	80.2	53.5	122.3
FARROWING PERFORMANCE
Average gestation length	115	115	114	116
Average parity of farrowed sows	3.5	3.5	2.7	4.4
Farrowing interval	150	148	141	160
Farrowing rate, %	73.2	74.8	85	60
Average total pigs / litter	11.2	11.2	12.1	10.4
Average pig born alive / litter	10.2	10.2	10.9	9.5
Average stillborn pigs	0.82	0.80	0.5	1.1
Average mummies per litter	0.18	0.20	0.1	0.3
Percent <7 born alive	11.4	11.0	7.4	16
PWM for farrowed and weaned	13.1	12.9	8.9	17.8
Litters / female / year	2.1	2.15	2.36	1.8
Litters / mated female / year	2.23	2.27	2.46	1.94
Old litters / mated female / year	2.14	2.21	2.47	1.73
Litters / farrowing crate / year	13.7	13.4	18.3	9.2
WEANING PERFORMANCE
Pigs weaned per litter weaned	9.0	9.1	9.7	8.3
Average age at weaning	18.9	18.3	14.5	24.5
Adjusted 21-d litter weight (lb./ kg.)	124 / 56	124 / 56	143 / 65	108 / 49
Pigs weaned per sow	8.8	8.9	9.5	8.2
Pigs weaned / mated female / year	19.7	20.1	22.8	16.4
Old pigs wnd / mated female / year	19.2	19.6	22.9	15.2
Pigs weaned / female / year	18.6	18.9	21.9	15.2
Pigs weaned / lifetime	30.7	30	46	16
Pigs weaned / farrowing crate / year	123	118	160	84
POPULATION
Average female inventory (AFI)	624	460	1384	133
AFI / farrowing crate	7.4	6.5	9.8	4.6
Average gilt pool inventory	41	29	80	7
Gilt pool: Female inventory, %	6.5	6.0	11.3	2.5
Sow: Boar Ratio	56	26	97	11
Average parity	2.55	2.5	3.3	1.8
Replacement rate, %	58.5	55.8	36.8	81.7
Culling rate, %	45.5	43.6	27.8	65.2
Death rate, %	5.9	5.3	2	10.2
Average parity of culled sows	3.7	3.6	5.3	2.1
Farm n=612; Median is a 50 percentile