Table 5.
Serum insulin, serum prolactin, and plasma glucose concentrations for steers fed endophyte-free (E−) or endophyte-infected (E+) fescue seed above (Experiment 1) or within (Experiment 2) their thermoneutral zone.
| Item | Day of feeding fescue seeda | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 8 | 14 | P = | |||||||
| E− | E+ | E− | E+ | E− | E+ | SE | Trtb | Day | Day × Trt | |
| EXPERIMENT 1 | ||||||||||
| Prolactin, ng/mL | 175 | 75 | 160 | 24 | 117 | 21 | 86 | 0.37 | 0.03 | 0.44 |
| Insulin, uIU/mL | 14.1 | 18.4 | 16.5 | 20.9 | 17.6 | 23.3 | 1.7 | 0.02 | 0.03 | 0.88 |
| Glucose, mM | 3.53 | 3.71 | 3.58 | 3.70 | 3.63 | 3.74 | 0.02 | 0.31 | 0.40 | 0.76 |
| tEXPERIMENT 2c | ||||||||||
| Prolactin, ng/mL | 92 | 55 | 54 | 29 | 67 | 44 | 13.1 | 0.14 | 0.30 | 0.84 |
| Insulin, uIU/mL | 19.1 | 20.5 | 20.1 | 20.5 | 20.6 | 23.1 | 1.2 | 0.07 | 0.76 | 0.18 |
| Glucose, mM | 4.01 | 4.28 | 4.12 | 4.25 | 4.07 | 4.33 | 0.05 | 0.01 | 0.45 | 0.19 |
a
Periods lasted 35 days; fescue seed was fed for 14 days (d22–d35) of each period.
b
Trt, treatment.
c
Day 20 values were used as a covariate in Experiment 2.