Table 3. Model-estimated lamb:ewe ratios and pathogen detection status in 21 bighorn sheep populations.
| Mycoplasma ovipneumoniae | Mannheimia haemolytica | Mannheimia species1 | Bibersteinia trehalosi | Pasteurella multocida1 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| + | -2 | + | -2 | + | -2 | + | -2 | + | -2 | |
| # Populations3 | 16 | 5 | 15 | 4 | 18 | — | 10 | 8 | 15 | 2 |
| Mean lamb:ewe ratio (95% CI) | 0.25 (0.21-0.30) | 0.37 (0.27-0.51) | 0.29 (0.24-0.35) | 0.29 (0.19-0.42) | 0.27 (0.22-0.33) | — | 0.28 (0.23-0.37) | 0.29 (0.21-0.36) | 0.27 (0.23-0.33) | 0.31 (0.18-0.52) |
| Minimum mean population-specific lamb:ewe ratio | 0.13 (MT-213) | 0.31 (WY-6) | 0.15 (MT-499) | 0.13 (MT-213) | 0.12 (MT-213) | — | 0.20 (WY-22) | 0.13 (MT-213) | 0.13 (MT-213) | 0.20 (WY-22) |
| Maximum mean population-specific lamb:ewe ratio | 0.41 (MT-302) | 0.48 (MT-622) | 0.41 (MT-302) | 0.48 (MT-622) | 0.48 (MT-622) | — | 0.41 (MT-302) | 0.48 (MT-622) | 0.41 (MT-302) | 0.48 (MT-622) |
1. Absence of Mannheimia species was never reliably assessed in populations where they were not detected. Estimates obtained from intercept only model.
2. Data from populations where the probability of presence for a particular pathogen was ≥ 0.10 were not used in the regression analysis
3.One population (MT-340) was excluded due to insufficient demographic data