Table 3.

Correlation between carbohydrate-related molecular spectral characteristics and truly digestible nutrients in model forage (Medicago sativa spp. Sativa: Alfalfa).

Item a	TDN1x % DM		tdNFC % DM		tdFA % DM		tdNDF % DM
	r b	p Value	r	p Value	r	p Value	r	p Value
Structural CHO related Spectral Profiles
A_StCHO	−0.09	0.872	0.09	0.872	−0.54	0.266	−0.81	0.050
H_1415	0.19	0.725	0.37	0.470	−0.49	0.320	−0.70	0.118
H_1370	−0.06	0.913	0.12	0.827	−0.61	0.200	−0.87	0.025
H_1315	0.00	1.000	0.09	0.868	−0.71	0.117	−0.85	0.032
A_1315	−0.83	0.042	−0.83	0.042	−0.14	0.787	−0.32	0.538
Cellulosic Compounds Related Spectral Profiles
H_1244	0.09	0.868	0.00	1.000	−0.85	0.031	−0.72	0.109
A_CELC	0.09	0.872	−0.09	0.872	−0.83	0.042	−0.55	0.257
Total CHO related Spectral Profiles
A_CHO	0.03	0.957	0.03	0.957	−0.71	0.111	−0.75	0.084
H_1150	−0.03	0.957	0.06	0.913	−0.64	0.173	−0.79	0.059
H_1100	−0.03	0.957	0.06	0.913	−0.64	0.173	−0.79	0.059
H_1025	−0.03	0.957	0.06	0.913	−0.64	0.173	−0.79	0.059
Non-structural CHO related Spectral Profiles
A_non-st CHO	−0.09	0.872	0.09	0.872	−0.54	0.266	−0.81	0.500
H_895	−0.13	0.805	0.39	0.441	0.13	0.805	−0.66	0.150
Spectral Ratio Profiles
A_StCHO/A_CHO ratio	0.49	0.329	0.71	0.111	−0.09	0.872	−0.26	0.618
A_Non-stCHO/A_CHO ratio	−0.41	0.414	0.00	1.000	0.83	0.042	0.11	0.843
A_Non-stCHO/A_StCHO ratio	−0.21	0.695	0.03	0.956	0.91	0.011	0.40	0.428
A_CELC/A_CHO ratio	−0.03	0.957	−0.43	0.397	−0.94	0.005	−0.32	0.538
A_CELC/A_StCHO ratio	−0.09	0.872	−0.54	0.266	−0.54	0.266	0.06	0.913

^a r: correlation coefficient; ^b TDN_1x: total digestible nutrient at maintenance level; tdNFC: total digestible non-fiber carbohydrate; tdFA: total digestible fatty acid; tdNDF: total digestible neutral detergent fiber.