Table 7. Linear regression between metabolites and insulin resistance indexes for dairy cows under tropical conditions.
| Variable | QICKI | R 2 | RQUICKI | R 2 |
|---|---|---|---|---|
| Insulin | y = 535.13−1,192.29x | 0.8 | y = 421.03−706.38x | 0.52 |
| BHB | y = −0.70 + 3.90x | 0.38 | y = -0.58−2.88x | 0.39 |
| NEFA | y = −0.50 + 2.32x | 0.27 | y = 0.48−0.34x | 0.01 |
| Glucose | y = 8.40−15.71x | 0.64 | y = 6.75−8.97x | 0.39 |
| T4 | y = 149.58−280.43x | 0.41 | y = 123.14−167.04x | 0.27 |
| T3 | y = 3.60−4.15x | 0.29 | y = 3.42−2.96x | 0.27 |
| Cortisol | y = 565.89−1,124.51x | 0.36 | y = 317.43−350.51x | 0.06 |
| BCS | y = 6.73−9.79x | 0.76 | y = 6.34−7.01x | 0.73 |
| Variable | RQUICKI–BHB | R 2 | HOMA | R 2 |
|---|---|---|---|---|
| Insulin | y = 330.28−472.91x | 0.17 | y = 34.24 + 1.66x | 0.87 |
| BHB | y = 0.42 + 0.59x | 0.01 | y = 0.94−0.01x | 0.41 |
| NEFA | y = 1.22−1.86x | 0.23 | y = 0.44−0.0026x | 0.18 |
| Glucose | y = 4.88−4.50x | 0.07 | y = 1.89 + 0.02x | 0.57 |
| T4 | y = 75.69−57.06x | 0.02 | y = 32.13 + 0.38x | 0.43 |
| T3 | y = 2.71−1.28x | 0.04 | y = 1.81 + 0.01x | 0.44 |
| Cortisol | y = 2.90−293.32x | 0.03 | y = 103.17 + 1.34x | 0.28 |
| BCS | y = 5.05−3.88x | 0.16 | y = 2.65 + 0.01x | 0.74 |
BHB: betahidroxibutirate; NEFA: nonesterified fatty acid; T 3: triiodothyronine; T 4: thyroxine; BCS: body condition score; QUICKI: quantitative insulin sensitivity check index; RQUICKI: revised quantitative insulin sensitivity check index; RQUICKI–BHB: revised quantitative insulin sensitivity check index–BHB; HOMA: homeostasis model assessment.