Table 1.
Salmonella percent prevalence in subiliac peripheral lymph nodes (PLN) of feedlot-fattened (FF) and cull cattle at harvest by region and season.
| Season | Cull cattle PLN | All Cull | FF cattle PLN | All FF | Overall by season | ||||
|---|---|---|---|---|---|---|---|---|---|
| Region A | Region B | Region C | Region A | Region B | Region C | ||||
| COOLER SEASON | |||||||||
| Sample sets | 1 | 9 | 3 | 13 | 12 | 9 | 5 | 26 | 39 |
| Number of PLNs | 76 | 561 | 245 | 882 | 892 | 551 | 379 | 1,822 | 2,704 |
| Positive (n =) | 0 | 12 | 3 | 15 | 2 | 36 | 11 | 49 | 64 |
| Mean % | 0 | 2.14 | 1.22 | 1.70 | 0.22 | 6.53 | 2.90 | 2.69 | 2.37 |
| WARMER SEASON | |||||||||
| Sample sets | 2 | 9 | 3 | 14 | 10 | 9 | 6 | 25 | 39 |
| Number of PLNs | 145 | 567 | 246 | 958 | 754 | 570 | 464 | 1,788 | 2,746 |
| Positive (n =) | 7 | 6 | 5 | 18 | 8 | 177 | 22 | 207 | 225 |
| Mean % | 4.83 | 1.06 | 2.03 | 1.88 | 1.06 | 31.05 | 4.74 | 11.52 | 8.19 |
| OVERALL BY REGION | |||||||||
| Sample sets | 3 | 18 | 6 | 27 | 22 | 18 | 11 | 51 | 78 |
| Number of PLNs | 221 | 1,128 | 491 | 1,840 | 1,646 | 1,121 | 843 | 3,610 | 5,450 |
| Positive (n =) | 7 | 18 | 8 | 33 | 10 | 213 | 33 | 256 | 289 |
| Mean % | 3.17 | 1.60 | 1.63 | 1.79 | 0.61 | 19.0 | 3.91 | 7.09 | 5.3 |
Collection seasons were defined as cooler weather months (February–May and November–December, 2012) and the warmer weather months (June–October, 2012). Regions are based on geographic locations including: Region A (Colorado, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Missouri, Nebraska, Ohio, Pennsylvania, Virginia, and West Virginia), Region B (Arizona, New Mexico, Oklahoma, and Texas) and Region C (California, Nevada, and Utah).