Table 1. Least squares means and standard errors of frequency, stiffness, decrement, relaxation and creep in Ross 308 and Arbor Acres by week

Characteristic	Breed	Week 2	Week 4	Week 6	Week 8
Frequency	Ross 308	15.78±0.16^Aa	13.70±0.16^Ab	12.97±0.16^Ac	15.51±0.16^Aa
Frequency	Arbor Acres	17.88±0.27^Ba	15.20±0.27^Bb	14.31±0.27^Bc	14.17±0.27^Bd
Stiffness	Ross 308	314.77±5.47^Aa	210.34±5.47^Ab	192.12±5.47^Ac	270.99±5.47^Ad
Stiffness	Arbor Acres	381.43±8.15^Ba	263.35±8.15^Bb	236.69±8.15^Bc	237.49±8.15^Bc
Decrement	Ross 308	1.27±0.03Aa	1.19±0.03^Ab	1.05±0.03^Ac	0.90±0.03^Ad
Decrement	Arbor Acres	1.79±0.04^Ba	0.89±0.04^Bb	1.15±0.04^Bc	1.26±0.04^Bd
Relaxation	Ross 308	15.42±0.31^Aa	20.10±0.31^Ab	22.87±0.31^Ac	17.67±0.31^Ad
Relaxation	Arbor Acres	13.12±0.46^Ba	17.13±0.46^Bb	21.09±0.46^Bc	21.17±0.46^Bc
Creep	Ross 308	0.90±0.02^Aa	1.16±0.02^Ab	1.37±0.02^Ac	1.05±0.02^Ad
Creep	Arbor Acres	0.80±0.03^Ba	0.98±0.03^Bb	1.28±0.03^Bc	1.30±0.03^Bc

Values are least squares means±standard errors.
Comparison of significance between two breeds in the same week (P<0.05).
The different letters of superscript within the column significantly differ.