1999 Breeding Herd Summary- USA
Measurement	Average	Median	Upper 10%	Lower 10%
BREEDING PERFORMANCE
Repeat services, %	14.1	13.8	10.1	6.9
Multiple Matings, %	87.3	92.4	97.2	99
Entry-to-service interval, day	42.6	39.4	25.5	15.9
Sows bred by seven days, %	82.7	84.9	89.8	93.4
Weaning-to-first-service interval	7.8	7.1	6.3	5.6
Average nonproductive days	86	77	63	53
FARROWING PERFORMANCE
Average gestation length	115	115	115	114
Average parity of farrowed sows	3.1	3.2	3.7	4.1
Farrowing interval	147	146	142	140
Farrowing rate, %	76.4	77.4	82	85.1
Average total pigs / litter	11.1	11.2	11.6	12
Average pig born alive / litter	10.1	10.1	10.5	10.8
Average stillborn pigs	0.8	0.80	0.7	0.5
Average mummies per litter	0.2	0.20	0.1	0.1
Percent <7 born alive	12.21	11.9	9.9	8.2
PWM for farrowed and weaned	12.4	12	10.3	8.5
Litters / female / year	2.08	2.17	2.29	2.37
Litters / mated female / year	2.31	2.35	2.44	2.5
Old litters / mated female / year	2.26	2.34	2.45	2.53
Litters / farrowing crate / year	14.5	14.3	15.9	17.8
WEANING PERFORMANCE
Pigs weaned per litter weaned	9.0	9	9.4	9.8
Average age at weaning	18.0	17.7	16.1	14.8
Adjusted 21-d litter weight (lb./ kg.)	126.0	125	134	143
Pigs weaned per sow	8.8	8.9	9.2	9.5
Pigs weaned / mated female / year	19.6	20.4	22	23.2
Old pigs wnd / mated female / year	20.6	20.9	22.7	24.2
Pigs weaned / female / year	18.0	18.9	20.5	22
Pigs weaned / lifetime	25.1	27	354	43
Pigs weaned / farrowing crate / year	129	126	142	164
POPULATION
Average female inventory (AFI)	869	588	1185	2028
AFI / farrowing crate	7	6.7	7.4	9.0
Average gilt pool inventory	60	46	88	132
Sow: Boar Ratio	31	29	44	57
Average parity	2.4	2.4	2.8	3.4
Replacement rate, %	56.9	53.9	42.5	29.9
Culling rate, %	44.6	43	32.9	25.5
Death rate, %	6.9	6.5	4.2	2.7
Average parity of culled sows	3.1	3.2	4.2	5.0
Farm n=612; Median is a 50 percentile