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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Sci Total Environ. 2016 Jun 6;566-567:1062–1068. doi: 10.1016/j.scitotenv.2016.05.130

Table 1.

Animal units by type of AFO for AFOs operating between 2006 and 2011 that were registered, permitted, or monitored by the Iowa Department of Natural Resources. Percentages correspond to total animal units within each AFO type.

Animal Type Units for All
AFOs		 Units for Open
AFOs		 Units for
Confined AFOs		 Units for Mixed
AFOs
Swine 7,389,541   (73%) 33,754       (  3%) 7,186,783   (86%) 169,004  (30%)
Dairy Cattle 226,195      (  2%) 34,453       (  3%) 104,054      (  1%) 86,688    (15%)
Beef Cattle 1,466,881   (15%) 1,083,229  (94%) 70,417        (  1%) 313,235  (55%)
Chickens 945,345      (  3%) 13              (  0%) 945,228      (11%) 104         (  0%)
Turkeys 75,762        (  1%) 0                (  0%) 73,506        (  1%) 2,256      (  0%)
Horses 6,678          (  0%) 2,832         (  0%) 3,624          (  0%) 222         (  0%)
Sheeps, Lambs, and Goats 3,661          (  0%) 2,098         (  0%) 315             (  0%) 1,358      (  0%)
Totals 10,109,063 1,156,379 8,383,927 572,867