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Environmental Guidelines for Confinement Swine Housing
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ISU Publication #: Pm1586
Authors: Jay D. Harmon and Hongwei Xin
Department of Agricultural and Biosystems Engineering
Iowa State University
Date: 2/95
Humidity
Maintain relative humidities in the range of 50 to 60 percent. This reduces disease potential because bacteria is not prolific at relative humidities of 30 to 60 percent. Viruses are not prolific from 50 to 70 percent. Fungi grow well at humidities over 60 percent and several of the respiratory infections grow slowest at 50 percent.
Drafts
Drafts on small pigs of 30 feet per minute or greater may cause stress. Drafts of 60 feet per minute or less is not harmful to large pigs during winter. In summer, air drafts will be benefical to large hogs due to increased cooling potential.
Temperature
The table on the back suggests optimal temperature ranges for pigs. Young pigs may be provided with zone heating to maintain temperature without heating the entire room. Measure temperatures at pig levels.
Pig Age Approx. Pig Weight Low Temp. High Temp.
Weeks lbs degrees F degrees F
At Birth 90 95
3 12 86 88
4 16 84 88
5 20 83 86
6 24 80 86
7 30 78 84
8 38 76 84
9 46 73 82
10 56 70 82
11 68 68 80
12 80 66 80
13 92 64 80
14 104 62 80
15 116 60 80
16 128 58 80
17 141 56 80
18 155 56 80
19 171 56 80
20 187 54 80
22 215 54 80
24 240 52 80
26 260 52 80
Sow, lactating 60 75
Sow, gestating 55 80
Boar 55 75
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