2001 Breeding Herd Summary- USA
Measurement	Mean	Mean to Mean+1Std	>Mean +1 Std
BREEDING PERFORMANCE
Repeat Services, %	14.0	12.7	9.5
Multiple Matings, %	85.5	88.7	88.3
Entry-to-first-service interval, days	37.5	37.3	38.3
Sows bred by seven days, %	84.2	85.5	87.6
Weaning-to-first-service interval	8.0	7.3	6.7
Average nonproductive days	87	72	57
FARROWING PERFORMANCE
Average gestation length	115	115	115
Average parity of farrowed sows	3.4	3.4	3.4
Farrowing interval	149	146	143
Farrowing rate, %	69.0	73.3	79.8
Average total pigs per litter	11.3	11.4	11.8
Average pigs born alive/ litter	10.2	10.3	10.7
Average stillborn pigs	0.9	0.9	0.8
Average mummies per litter	0.2	0.2	0.3
Percent <7 bornalive	11.9	11.4	9.0
PWM for farrowed and weaned	13.8	13.2	10.9
Litters per female per year	2.1	2.2	2.3
Litters per mated female per year	2.2	2.4	2.5
Old litters/mated females/year	2.0	2.2	2.4
WEANING PERFORMANCE
Pigs weaned per litter weaned	8.9	9.1	9.5
Average age at weaning	18.3	18.1	17.5
Pigs weaned per sow	8.8	9.0	9.6
Pigs weaned/ mated female/ year	19.7	21.2	23.6
Old pigs wnd/ mated female/ year	18.5	20.5	23.1
Pigs weaned/ female/ year	18.6	19.9	22.3
Pigs weaned/ lifetime	30.6	31.5	35.3
POPULATION
Average female inventory (AFI)	942	1085	1249
Average gilt pool inventory	64	71	74
Average parity	2.5	2.5	2.6
Replacement rate, %	57	60	56
Culling rate, %	39	40	42
Death rate, %	6.8	7.2	7.0
Average parity of culled sows	3.8	3.9	4.0
#Farms Included=786        Mean (based on Pigs Weaned/Mated Female/ Year)=19.7          STDEVP=3.07