Table 4 Estimated odds ratios with their 95% confidence limits of the per cycle foaling rate by classes for the fixed effects of age of the mare at covering, status of the mare before covering, mating type and month of covering
Levels of the fixed effects | Number of observations | Odds ratio | 95%-CI |
|---|---|---|---|
Age of mare (years) | |||
2–5 | 1179 | 1.98 | 1.65–2.39 |
6–8 | 1136 | 1.85 | 1.54–2.22 |
9–12 | 1079 | 1.50 | 1.25–1.80 |
> 12 | 1054 | 1.00 | |
Status of mare | |||
Foaled | 1119 | 1.76 | 1.50–2.06 |
Barren | 1616 | 1.02 | 0.88–1.18 |
Not mated | 1799 | 1.00 | |
Mating type | |||
Natural mating | 3887 | 4.01 | 1.73–9.29 |
On-site AI | 425 | 2.05 | 0.88–4.78 |
Transported semen | 169 | 3.24 | 1.34–7.82 |
Frozen semen | 45 | 1.00 | |
Month of covering | |||
February–March | 354 | 0.83 | 0.62–1.13 |
April | 1026 | 1.21 | 0.96–1.52 |
May | 1508 | 1.14 | 0.92–1.42 |
June | 1150 | 1.15 | 0.91–1.44 |
July–August | 496 | 1.00 | |
Stallion line of mare | |||
D | 1023 | 0.88 | 0.71–1.10 |
F | 186 | 1.16 | 0.82–1.64 |
K | 43 | 2.79 | 1.40–5.56 |
M | 1373 | 1.03 | 0.83–1.26 |
R | 1212 | 0.79 | 0.63–0.97 |
V | 89 | 1.15 | 0.72–1.83 |
W | 608 | 1.00 | |