Table 2 Linear regression analysis for farrowing related traits using the Placebo, 0.5 and 1.0 mg PGE2 data set and the Placebo, 0.5, 1.0 and 2.0 mg PGE2 data set. Significant differences in the linear regression models are marked bold
Models using PGE2 0, 0.5 and 1.0 mg | P-values | Models using PGE2 0, 0.5, 1.0 and 2.0 mg | P-values | |
|---|---|---|---|---|
No. of sows | 9 | 12 | ||
Birth duration (min) | ||||
Intercept (SE) | 307 (61) | < 0.01 | 267 (53) | < 0.01 |
PGE2 conc. | − 156 (95) | 0.14 | −53 (46) | 0.27 |
R2 | 0.27 | 0.12 | ||
Parturition interval (min) | ||||
Intercept (SE) | 565 (59) | < 0.01 | 491 (76) | < 0.01 |
PGE2 conc. | − 269 (92) | 0.02 | − 75 (67) | 0.29 |
R2 | 0.55 | 0.11 | ||
Piglets interval after treatment (min) | ||||
Intercept (SE) | 17.3 (3.2) | < 0.01 | 16.6 (2.5) | < 0.01 |
2 conc. | −5.3 (4.9) | 0.3774 | −3.6 (2.2) | 0.13 |
R2 | 0.14 | 0.20 | ||
Piglets interval before treatment(min) | ||||
Intercept (SE) | 21.7 (3.5) | < 0.01 | 18.7 (3.0) | < 0.01 |
PGE2 conc. | −12.9 (5.3) | 0.05 | −5.2 (2.6) | 0.08 |
R2 | 0.46 | 0.30 | ||
Piglets interval (min) | ||||
Intercept (SE) | 18.5 (2.6) | < 0.01 | 17.3 (2.2) | < 0.01 |
PGE2 conc. | −7.2 (3.9) | 0.11 | −4.1 (2.0) | 0.06 |
R2 | 0.32 | 0.32 | ||
Placenta expulsion duration (min) | ||||
Intercept (SE) | 379 (56) | < 0.01 | 303 (68) | < 0.01 |
PGE2 conc. | − 254 (87) | 0.03 | − 48.0 (59) | 0.44 |
R2 | 0.53 | 0.06 | ||
Time from last piglet to first placental part (min) | ||||
Intercept (SE) | − 126.7 (48) | < 0.01 | −85 (41) | < 0.01 |
PGE2 conc. | 138.6 (75) | 0.11 | 32 (36) | 0.40 |
R2 | 0.33 | 0.07 | ||
Time from last piglet to last placental part (min) | ||||
Intercept (SE) | 258 (67) | < 0.01 | 223 (59) | < 0.01 |
PGE2 conc. | − 113 (104) | 0.32 | −22 (51) | 0.68 |
R2 | 0.14 | 0.02 | ||