Table 3. Descriptive statistics of 18 categorical variables from 37 chicken broiler flocks surveyed in a study on the occurrence of breast myopathies in Ontario, Canada (2019–2020).
| Variables | Number (%) of response | Variables | Number (%) of response |
|---|---|---|---|
| Farm variables | Flock health variables-continued | ||
| Number of floors in barns | Bronchitis vaccine | ||
| > 2 floors | 25 (67.6) | Administered | 37 (100) |
| 1 floor | 12 (32.4) | Not administered | 0 (0) |
| FSA* of growers | Coccidiosis vaccine | ||
| L0G | 1 (2.7) | Administered | 6 (16.2) |
| L0R | 1 (2.7) | Not administered | 31 (83.8) |
| L9H | 1 (2.7) | E. coli vaccine | |
| N0B | 2 (5.4) | Administered | 2 (5.4) |
| N0G | 8 (21.6) | Not administered | 35 (94.6) |
| N0J | 2 (5.4) | Infectious bursal disease vaccine | |
| N0K | 4 (10.8) | Administered | 32 (86.5) |
| N0L | 3 (8.1) | Not administered | 5 (13.5) |
| N0M | 5 (13.5) | Infectious tenosynovitis vaccine | |
| N3B | 2 (5.4) | Administered | 7 (18.9) |
| N4G | 1 (2.7) | Not administered | 30 (81.1) |
| N4S | 3 (8.1) | Marek’s disease vaccine | |
| N4W | 1 (2.7) | Administered | 34 (91.9) |
| N7A | 3 (8.1) | Not administered | 3 (8.1) |
| FSA of hatcheries | Category II antimicrobialsa | ||
| N0G | 2 (5.4) | Administered | 2 (5.4) |
| N4N | 19 (51.4) | Not administered | 35 (94.6) |
| N5A | 16 (43.2) | Category III antimicrobialsb | |
| Flock demographics variables | Administered | 26 (67.6) | |
| Sex of broilers | Not administered | 12 (32.4) | |
| Female | 15 (40.5) | Coccidiostat and/or ionophores | |
| Male | 11 (29.7) | Administered | 27 (73.0) |
| Mixed | 11 (29.7) | Not administered | 10 (27.0) |
| Source of chicks | Processing plant variable | ||
| Domestic | 29 (78.4) | Chilling method | |
| Mixed | 4 (10.8) | Air-chilling | 19 (51.4) |
| USA | 4 (10.8) | Water-chilling | 18 (48.6) |
| Flock health variables | Environmental variable | ||
| Disease observed | Season | ||
| Observed | 4 (10.8) | Spring | 5 (13.5) |
| Not observed | 33 (89.2) | Summer | 10 (27.0) |
| Raised without antibiotics (RWA) | Fall | 11 (29.7) | |
| RWA flocks | 8 (21.6) | Winter | 11 (29.7) |
| Non-RWA flocks | 29 (78.4) | ||
*Forward sortation area.
aCategory II (High Importance) antimicrobials included amoxicillin and sulfadiazine, and trimethoprim.
bCategory III (Medium Importance) antimicrobials included avilamycin, bacitracin, sulfaquinoxaline, and pyrimethamine.