TABLE 2.
Means and standard deviations for airborne microbial flora recovered immediately downwind of cattle feedlot pens under two feeding regimens (four pens per treatment)
| Organism | Mean CFU/m3 of aira
|
|||||||
|---|---|---|---|---|---|---|---|---|
| Control feeding treatment
|
Test feeding treatment
|
|||||||
| BA, 22°C | BA, 37°C | BA Ano | SAB | BA, 22°C | BA, 37°C | BA Ano | SAB | |
| Bacillus cereus | 648 (232.6)b | 305 (101.5) | 81c | 550 (767.2) | 378 (465.2) | 49 (49.4) | ||
| Bacillus coagulans | 42c | 56c | 35c | 32c | 42c | 133c | ||
| Bacillus megaterium | 84c | |||||||
| Bacillus subtilis | 2,363 (2,731.4) | 320 (68.3) | 347c | 1,491 (1,652.6) | 380 (387.6) | 266 (118.8) | ||
| Chrysobacterium meningosepticum | 14c | 350c | ||||||
| Corynebacterium aquaticum | 4,256c | 119 (69.3) | 1,712 (1420.6) | 249 (311.8) | 161c | |||
| Corynebacterium bovis | 287c | 189c | ||||||
| Corynebacterium genitalium | 238c | |||||||
| Corynebacterium pseudotuberculosis | 7c | 7c | ||||||
| Corynebacterium renale group | 819 (729.2) | 413 (297.0) | 1,087 (1,399.6) | 394 (313.6) | ||||
| Helocococcus kunzei | 7c | 63 (79.2) | 168c | 7c | 189c | 14c | ||
| Micrococcus luteus | 105c | 1,106c | 420c | 49 (9.9) | 616 (252.4) | 298 (391.0) | ||
| Paenibacillus macerans | 46 (54.4) | 53 (22.3) | ||||||
| Alternaria sp. | 42 (18.6) | 56 (18.5) | ||||||
| Bipolaris sp. | 28c | |||||||
| Chrysosporium sp. | 35c | 14 (9.6) | ||||||
| Cladosporium sp. | 40 (22.6) | 53 (32.6) | ||||||
| Penicillium sp. | 12 (10.6) | 42 (28.0) | ||||||
a
BA, blood agar; BA Ano, blood agar plates incubated anaerobically at 37°C; SAB, Sabouraud's agar incubated at 24°C.
b
The values in parentheses are standard deviations.
c
Only one count for the organism was obtained; therefore, there is no standard deviation.