Table 1.
Effect of cattle group in relation to age and hair color on hair cortisol concentration in beef feedlot steers (N = 18).
| Outcome | n | Cattle group1 |
Pooled SEM |
P-value | ||
|---|---|---|---|---|---|---|
|
OB (n = 3) |
OW (n = 3) |
YB (n = 12) |
||||
| Hair cortisol (pg/mg)2 |
18 | 7.57a | 10.89a | 0.98b | 1.15 | <0.001 |
a, b
Within rows, values with different superscripts differ (P < 0.05).
1
Steers were categorized into one of three groups: OB, old with black hair (~9 years of age), n = 3; OW, old with white hair (~9 years of age), n = 3; YB, young with black hair (~2.5 years of age), n = 12.
2
Means and pooled standard error are reported on the original scale, while the P-value is reported based on the base 10 logarithm transformed values that were used to obtain a normal distribution of data.