Table 3. Plasma glucose, insulin and NEFA response to i.v. glucose tolerance test (IVGTT, 0.3 g of glucose i.v. /kg of BW) of Finnhorse mares before and after the grazing season.
| Time relative to the grazing season b | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Before grazing (May) | After grazing (September) | ||||||||
| Item a | NG | CG | SEM | P-value | NG | CG | SEM | P-value | Covariate c |
| Glucose | |||||||||
| Basal (mmol/L) | 5.8 | 5.3 | 0.08 | 0.01 | 5.8 | 5.4 | 0.14 | 0.04 | NS |
| Peak (mmol/L) | 22.2 | 22.2 | 0.78 | 0.97 | 22.6 | 21.7 | 0.45 | 0.19 | 0.07 |
| CR 180 (%/min) | 0.79 | 0.81 | 0.06 | 0.72 | 0.72 | 0.81 | 0.04 | 0.03 | NS |
| AUC 180 (mmol/L x min) | 895.3 | 878.0 | 44.35 | 0.79 | 927.0 | 902.8 | 50.21 | 0.70 | NS |
| Insulin | |||||||||
| Basal (μIU/mL) | 5.1 | 4.9 | 1.02 | 0.88 | 5.5 | 7.3 | 0.59 | 0.07 | 0.01 |
| Peak (μIU/mL) | 48.0 | 54.9 | 8.77 | 0.60 | 47.1 | 76.9 | 9.89 | 0.08 | 0.05 |
| AUC 180 (μIU/mL x min) | 4,869 | 6,431 | 1,052 | 0.33 | 4,698 | 7,465 | 1,107 | 0.13 | 0.06 |
| NEFA | |||||||||
| Basal (mmol/L) | 0.41 | 0.41 | 0.05 | 0.98 | 0.43 | 0.52 | 0.04 | 0.17 | NS |
| Nadir (mmol/L) | 0.05 | 0.03 | 0.01 | 0.26 | 0.05 | 0.04 | 0.01 | 0.33 | 0.02 |
| CR 180 (%/min) | 2.06 | 2.07 | 0.18 | 0.96 | 1.64 | 2.24 | 0.15 | 0.02 | NS |
| AUC 180 (mmol/L x min) | -49.6 | -49.7 | 4.74 | 0.98 | -43.3 | -63.5 | 4.52 | 0.03 | 0.06 |
aBasal, average concentration at 10 and 5 min before IVGTT; CR180, clearance rate during first 180 min of IVGTT; AUC180, area under the curve during the first 180 min of IVGTT; NEFA, non-esterified fatty acids.
bNG, semi-natural grassland group; CG, cultivated high-yielding pasture group.
cCovariate (May) was removed from the model, if the effect was not statistically significant (P > 0.10).