Table 6.
Summary of 83 risk-factor studies (number of studies) evaluating Salmonella in animal feeds, feed equipment and feed environment across sector of animal feed production.
| Sector of animal feed production | |||||
|---|---|---|---|---|---|
| Field (N = 5) | Plant (N = 19) | Transport (N = 4) | Retail (N = 1) | Farm (N = 36)a | Unspecified (N = 20) |
| Field characteristics (2) | Plant characteristics (9) | Transportation characteristics (1) | Retail site characteristics (0) | Farm characteristics (21) | |
| Season, climate or weather (3) | Season or climate (4) | Season or climate (0) | Season or climate (1) | Season or climate (8) | Season or climate (0) |
| Geographic region (2) | Geographic region (4) | Geographic region (2) | Geographic region (0) | Geographic region (7) | Geographic region (1) |
| Crop characteristics (0) | Feed characteristics (19) | Feed characteristics (3) | Feed characteristics (0) | Feed characteristics (14) | Feed characteristics (15) |
| Equipment characteristics (0) | Equipment characteristics (0) | Equipment characteristics (0) | Equipment characteristics (0) | Equipment characteristics (0) | |
| Other (0) | Otherd (3) | Other (0) | Other (0) | Otherb (10) | Otherc (7) |
Column totals may exceed the total number of studies for a sector because studies could evaluate more than one risk factor.
Age (2) and type of chickens (2), location from which feed was sampled (1), manure treatment on soil and forage (1), week of production (1), antimicrobial use (1), source (1), poultry production and biosecurity (i.e., number of years working on the farm, staff working on different farms, use of rodent traps, visitor registration, water supply system, shoe and vehicle disinfection barriers) (1), Salmonella surveillance (1), flock cycle (1), presence of starlings (1), year of study (1), restriction of visitor entry into chicken houses (1), downtime (1).
Year (5), airflow in housing and location of infected bird (1), Alphitobias beetles (1).
Day of the week (1), pelleting temperature (1), year (1).