Table I.

Description of the study population and production parameters of grower-finisher pigs from 1996 to 2000 in a multi-site production system in the United States

Parameters	1996	1997	1998	1999	2000
Number of barn closeouts (n)	270	285	291	320	335
Number of pigs placed	313205	327891	334823	368612	377508
Average entry weight (kg)	20.27	22.45	24.56	24.56	24.95
Standard deviation (s)	2.04	4.50	2.72	2.04	2.04
Average days on feed	132.34	131.33	124.31	119.26	120.08
s	3.74	8.30	3.72	2.23	2.94
Mortality rate (pigs/1000wk)
Median	2.25	2.97	3.38	3.22	3.67
Q1–Q3	1.82 to 2.97	2.28 to 3.86	3.38 to 4.20	3.22 to 4.24	3.67 to 4.61
Culling rate (pigs/1000wk)
Median	0.90	1.64	1.64	0.89	0.64
Q1–Q3	0.59 to 1.30	1.15 to 2.09	1.07 to 1.64	0.59 to 1.33	0.39 to 0.92