. | (A) Regression model without heat increment of feeding . | . | . | . | . | (B) Regression model including heat increment of feeding . | . | . | . | . | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fixed effect . | Coefficient (× 10−4) . | s.e.m. (× 10−4) . | Standardized coefficientc . | F1,1293 . | P-value . | Coefficient (× 10−4) . | s.e.m. (× 10−4) . | Standardized coefficientc . | F1,10 . | P-value . | ||||||||
Reproductiona | 19.574 | 1.621 | 145.7 | <0.001 | 1.091 | 8.308 | 0.40 | 0.898 | ||||||||||
Daily mean locomotor activity | 0.639 | 0.056 | 0.276 | 130.3 | <0.001 | 0.513 | 0.331 | −0.193 | 2.4 | 0.152 | ||||||||
Daily mean subcutaneous temperature | 7.356 | 0.818 | 0.184 | 80.8 | <0.001 | 19.176 | 5.823 | 2.221 | 10.8 | 0.008 | ||||||||
Daily mean air temperature | −0.951 | 0.162 | −0.179 | 34.7 | <0.001 | −4.349 | 2.124 | −0.056 | 4.2 | 0.068 | ||||||||
Daily mean wind speed | 0.260 | 0.079 | 0.003 | 10.9 | 0.001 | −0.928 | 1.073 | −0.230 | 0.7 | 0.407 | ||||||||
Heat increment of feeding | 1.630 | 0.659 | 0.037 | 6.1 | 0.033 | |||||||||||||
Amplitude of unexplained seasonal effect [cos(Julian day/365×2π−φ)]b | 301.9 | <0.001 | 12.0 | 0.002 |
. | (A) Regression model without heat increment of feeding . | . | . | . | . | (B) Regression model including heat increment of feeding . | . | . | . | . | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Fixed effect . | Coefficient (× 10−4) . | s.e.m. (× 10−4) . | Standardized coefficientc . | F1,1293 . | P-value . | Coefficient (× 10−4) . | s.e.m. (× 10−4) . | Standardized coefficientc . | F1,10 . | P-value . | ||||||||
Reproductiona | 19.574 | 1.621 | 145.7 | <0.001 | 1.091 | 8.308 | 0.40 | 0.898 | ||||||||||
Daily mean locomotor activity | 0.639 | 0.056 | 0.276 | 130.3 | <0.001 | 0.513 | 0.331 | −0.193 | 2.4 | 0.152 | ||||||||
Daily mean subcutaneous temperature | 7.356 | 0.818 | 0.184 | 80.8 | <0.001 | 19.176 | 5.823 | 2.221 | 10.8 | 0.008 | ||||||||
Daily mean air temperature | −0.951 | 0.162 | −0.179 | 34.7 | <0.001 | −4.349 | 2.124 | −0.056 | 4.2 | 0.068 | ||||||||
Daily mean wind speed | 0.260 | 0.079 | 0.003 | 10.9 | 0.001 | −0.928 | 1.073 | −0.230 | 0.7 | 0.407 | ||||||||
Heat increment of feeding | 1.630 | 0.659 | 0.037 | 6.1 | 0.033 | |||||||||||||
Amplitude of unexplained seasonal effect [cos(Julian day/365×2π−φ)]b | 301.9 | <0.001 | 12.0 | 0.002 |
The time period of the last two months of gestation and the first month of lactation was entered into the regression model as factor `reproduction'. This time period is known to be the most energetically challenging for the reproducing mare (Boyd and Houpt,1994; National Research Council, 1989).
No common coefficient computable for this fit of phase and amplitude of a periodic function; d.f., 2,1293 (A) and d.f., 2,10 (B), respectively, for the tested combined term.
Computed for numeric predictors only.