Table 5.
Estimated marginal means adjusted to a base of all steers for body-composition-adjusted final weight and performance-adjusted dietary net energy
| Treatment1 | Heifer adjustment | SEM2 | P Value3 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| A × B | H ET | J ET | A × H | A × J | Sex | Treatment | |||
| n | 14 | 15 | 16 | 15 | 16 | ||||
| n, steers | 9 | 6 | 11 | 7 | 8 | ||||
| n, heifers | 5 | 9 | 5 | 8 | 8 | ||||
| EBF, %4 | 35.8a | 35.1a | 34.4ab | 33.4ab | 31.1b | +0.7 | 1.0 | 0.42 | <0.01 |
| AFBW, kg5 | 522 | 520 | 512 | 549 | 502 | −58 | 16.5 | <0.01 | 0.22 |
| FSBW, % of AFBW6 | 128 | 124 | 124 | 121 | 117 | +4 | 4.0 | 0.26 | 0.23 |
| Dietary net energy, Mcal/kg DM for maintenance7 | 2.20 | 2.18 | 2.24 | 2.24 | 2.12 | −0.07 | 0.045 | 0.06 | 0.20 |
| Dietary net energy, Mcal/kg DM for gain7 | 1.52 | 1.50 | 1.55 | 1.56 | 1.45 | −0.06 | 0.040 | 0.06 | 0.20 |
| Observed:expected dietary net energy, Mcal/kg for maintenance8 | 1.02 | 1.01 | 1.04 | 1.04 | 0.99 | −0.03 | 0.021 | 0.06 | 0.20 |
| Observed:expected dietary net energy, Mcal/kg for gain8 | 1.03 | 1.02 | 1.05 | 1.06 | 0.99 | −0.04 | 0.027 | 0.06 | 0.20 |
| NEM required: expected9 | 0.98 | 1.00 | 0.92 | 0.91 | 1.08 | +0.101 | 0.067 | 0.07 | 0.24 |
1A × B was progeny of Angus bull × commercial Angus-influenced cow; H ET was progeny of Angus bull × commercial Angus-influenced cow gestated by Holstein cow; A × H was progeny of Angus bull × Holstein cow; J ET was progeny of Angus bull × commercial Angus-influenced cow gestated by Jersey cow; A × J was progeny of Angus bull × Jersey cow; H was straightbred Holstein.
2Largest standard error of treatment means.
3Tested as the ANOVA significance for the main effect.
4Empty body fat calculated using equation of Guiroy et al. (2001).
5Adjusted final body weight calculated using equation of Guiroy et al. (2001).
6Final live weight shrunk 4%.
7Performance-adjusted net energy calculated using equation of Zinn and Shen (1998).
8Ratio of performance-adjusted net energy to tabular net energy values.
9Ratio of net energy for maintenance (NEM) required (using retained energy, tubular net energy values, dry matter intake, and mean metabolic body weight) to expected value of 0.077 Mcal/kg of metabolic body weight.
a,bMeans without common superscript differ between treatments by pairwise comparisons with Tukey adjustment (P < 0.05).