Table 1.
Phenotypic means and heritabilities (h2)
| Trait | Day 20 | Day 28 | Day 28-20 | |||
|---|---|---|---|---|---|---|
| Mean ± SEM | h2 (SE) | Mean ± SEM | h2 (SE) | Mean ± SEM | h2 (SE) | |
| pH | 7.50 ± 0.0a | .17 (0.08) | 7.53 ± 0.003b | .10 (0.08) | 0.03 ± 0.004 | .05 (0.03) |
| pCO2, mmHg | 31.9 ± 0.1a | .21 (0.06) | 31.1 ± 0.2b | .05 (0.04) | −0.8 ± 0.2 | .07 (0.05) |
| pO2, mmHg | 43.3 ± 0.3a | .06 (0.04) | 43.9 ± 0.2a | .05 (0.05) | 0.5 ± 0.3 | .00 (0.03) |
| BE, mM | 1.8 ± 0.1a | .10 (0.05) | 3.3 ± 0.2b | .02 (0.02) | 1.5 ± 0.2 | .00 (0.02) |
| HCO3, mM | 25.0 ± 0.1a | .05 (0.04) | 26.0 ± 0.1b | .23 (0.12) | 1.0 ± 0.2 | .03 (0.02) |
| TCO2, mM | 25.9 ± 0.1a | .02 (0.03) | 26.9 ± 0.1b | .13 (0.09) | 1.0 ± 0.2 | .01 (0.01) |
| K, mM | 4.8 ± 0.0a | .20 (0.01) | 4.9 ± 0.0a | .02 (0.01) | 0.1 ± 0.0 | .10 (0.06) |
| Na, mM | 137.0 ± 0.2a | .08 (0.6) | 137.2 ± 0.3a | .01 (0.01) | 0.3 ± 0.3 | .01 (0.01) |
| iCa, mM | 1.25 ± 0.0a | .04 (0.01) | 1.28 ± 0.01b | .02 (0.01) | 0.02 ± 0.01 | .01 (0.01) |
| Hct, % PCV | 22.5 ± 0.2a | .01 (0.03) | 23.2 ± 0.1b | .21 (0.08) | 0.7 ± 0.2 | .02 (0.01) |
| Hb, g/dL | 7.7 ± 0.1a | .07 (0.05) | 7.9 ± 0.0b | .11 (0.04) | 0.2 ± 0.1 | .02 (0.01) |
| sO2, % | 83.2 ± 0.2a | .03 (0.05) | 84.7 ± 0.2b | .02 (0.02) | 1.5 ± 0.3 | .01 (0.01) |
| Glu, mg/dl | 252 ± 0.8a | .15 (0.08) | 243 ± 1b | .19 (0.09) | −8 ± 1 | .02 (0.02) |
Blood chemistry components were measured pre-heat (day 20), on the seventh day of heat treatment (day 28), and the calculated change due to heat (day 28–20). Different superscript letters within row represent significant differences (P ≤ 0.05)