Table III.
ANOVA reduced models for determinants of in-barn toxicant concentrations. Analyses were performed on log-transformed data. (df = degrees of freedom.)
| Endotoxin, EU/m3
| ||||
|---|---|---|---|---|
| Source | df | Mean Square | F | p value |
| Intercept | 1 | 3.78 | 3.71 | .059 |
| Barn | 1 | 5.63 | 5.54 | .022 |
| Season | 2 | 5.92 | 5.82 | .005 |
| Temperature | 1 | 3.83 | 3.76 | .058 |
| Number of Pigs | 1 | 2.49 | 2.45 | .124 |
| Barn * Season | 2 | 5.47 | 5.38 | .007 |
| Barn * Temperature | 1 | 4.08 | 4.02 | .050 |
| Barn * Number of Pigs | 1 | 11.34 | 11.15 | .002 |
| Season * Relative Humidity | 3 | 32.12 | 31.58 | .000 |
| Season * Number of Pigs | 2 | 5.01 | 4.93 | .011 |
| Temperature * Number of Pigs | 1 | 3.52 | 3.46 | .069 |
| Error | 53 | 1.02 | ||
| Inhalable Particulate, μg/m3
| ||||
|---|---|---|---|---|
| Source | df | Mean Square | F | p value |
| Intercept | 1 | 1.04 | 2.46 | .123 |
| Barn | 1 | 1.84 | 4.34 | .043 |
| Season | 2 | 0.84 | 1.98 | .150 |
| Wind | 1 | 3.38 | 7.98 | .007 |
| Temperature | 1 | 1.10 | 2.60 | .114 |
| Number of Pigs | 1 | 1.23 | 2.90 | .095 |
| Barn * Season | 2 | 2.20 | 5.19 | .009 |
| Barn * Wind | 1 | 1.94 | 4.58 | .037 |
| Barn * Temperature | 1 | 1.48 | 3.48 | .068 |
| Barn * Number of Pigs | 1 | 1.61 | 3.79 | .058 |
| Season * Wind | 2 | 1.80 | 4.25 | .020 |
| Season * Relative Humidity | 3 | 3.67 | 8.66 | .000 |
| Season * Number of Pigs | 2 | 1.98 | 4.68 | .014 |
| Temperature * Wind | 1 | 3.99 | 9.43 | .004 |
| Temperature * Number of Pigs | 1 | 1.26 | 2.98 | .091 |
| Error | 47 | 0.42 | ||
| Odor Threshold, dilutions
| ||||
|---|---|---|---|---|
| Source | df | Mean Square | F | p value |
| Intercept | 1 | 2.13 | 8.46 | .005 |
| Barn | 1 | 2.26 | 8.97 | .004 |
| Season | 2 | 2.18 | 8.66 | .001 |
| Temperature | 1 | 1.84 | 7.31 | .009 |
| Number of Pigs | 1 | 1.63 | 6.46 | .014 |
| Barn * Season | 2 | 2.15 | 8.52 | .001 |
| Barn * Temperature | 1 | 2.34 | 9.27 | .003 |
| Season * Number of Pigs | 2 | 2.16 | 8.57 | .001 |
| Temperature * Number of Pigs | 1 | 1.79 | 7.08 | .010 |
| Error | 58 | 0.25 | ||
| TSA Mesophilic Bacteria, cfu/m3
| ||||
|---|---|---|---|---|
| Source | df | Mean Square | F | p value |
| Intercept | 1 | 11.67 | 13.41 | .001 |
| Barn | 1 | 2.76 | 3.17 | .081 |
| Season | 2 | 5.88 | 6.76 | .002 |
| Barn * Number of Pigs | 2 | 5.06 | 5.82 | .005 |
| Season * Wind | 3 | 4.51 | 5.18 | .003 |
| Season * Temperature | 3 | 3.38 | 3.88 | .014 |
| Season * Relative Humidity | 3 | 6.79 | 7.81 | .000 |
| Temperature * Relative Humidity | 1 | 4.32 | 4.96 | .030 |
| Error | 54 | 0.87 | ||
| Total Microbes, organisms/m3
| ||||
|---|---|---|---|---|
| Source | df | Mean Square | F | p value |
| Intercept | 1 | 20.06 | 16.58 | .000 |
| Barn | 1 | 15.24 | 12.59 | .001 |
| Season | 2 | 9.41 | 7.78 | .001 |
| Barn * Season | 2 | 2.84 | 2.35 | .105 |
| Season * Wind | 3 | 2.41 | 2.00 | .125 |
| Season * Temperature | 3 | 22.13 | 18.29 | .000 |
| Season * Relative Humidity | 3 | 5.64 | 4.66 | .006 |
| Error | 55 | 1.21 | ||
| Hydrogen Sulfide, ppb
| ||||
|---|---|---|---|---|
| Source | df | Mean Square | F | p value |
| Intercept | 1 | 4.38 | 5.91 | .018 |
| Barn | 1 | 0.06 | 0.08 | .779 |
| Barn * Number of Pigs | 2 | 2.24 | 3.02 | .056 |
| Relative Humidity * Wind | 1 | 1.65 | 2.22 | .141 |
| Error | 65 | 0.74 | ||
r2 = .717 (adjusted r2 = .637)
r2 = .673 (adjusted r2 = .533)
r2 = .723 (adjusted r2 = .670)
r2 = .848 (adjusted r2 = .805)
r2 = .639 (adjusted r2 = .548)
r2 = .608 (adjusted r2 = .584)