Dry forages fed in Japan are not commonly analyzed for undigested neutral detergent fiber on an organic matter basis (uNDFom). This study was conducted to evaluate (1) uNDFom composition of dry forages fed in Japan, (2) accuracy of near-infrared (NIR) analysis for uNDFom of dry forages, and (3) uNDFom differences on prediction of dry matter intake (DMI) and milk production. Forages (2 alfalfa hays, 3 timothy hays, 4 sudan grasses, 2 klein grasses, 1 ryegrass straw and 1 fescue straw) with different grades or processing were obtained. The forages were ground to pass a 1-mm screen and sent to 3 laboratories in the US (Lab A, B and C) to conduct wet chemistry and NIR analyses for uNDFom at 30, 120, and 240 h. Wet chemistry results of all laboratories were averaged for each analyte to create reference values. Mean difference between the reference values and NIR results, and standard deviation of the difference were plotted to calculate Euclidean distance from the center point (ED) for measures of NIR similarity to wet chemistry. The NIR accuracy described as ED ranged from 2.30 to 3.14 at Lab A and from 3.66 to 4.35 at Labs B and C. Wet chemistry results were used to model rations by the Cornell Net Carbohydrate and Protein System v 6.55. Predicted DMI and milk production varied as a function of forage uNDFom content. It is possible to evaluate nutritional values of dry forages that which could affect DMI and milk production based on NIR or wet chemistry analysis for uNDFom composition. Table 1. Undigested NDF on organic matter basis (uNDFom) of dry forages analyzed by wet chemistry (% of dry matter)

Forages1	uNDFom30		uNDFom120		uNDFom240
	Mean		SE		Mean	SE	Mean	SE
Alfalfa Premium	25.2	0.3		24.0	0.5		23.1	0.7
Alfalfa #1	26.3	0.5		25.4	0.3		24.6	0.4
Timothy 1st Premium	29.5	0.2		23.5	2.0		21.3	1.2
Timothy 1st #1	27.7	0.5		20.9	1.2		19.2	1.1
Timothy 2nd #1	33.7	0.8		24.9	1.0		22.7	1.2
Sudan P/S pressed	21.4	0.4		13.8	0.9		11.5	1.0
Sudan P/S no pressed	22.4	0.6		14.2	1.1		12.3	1.1
Sudan F/S pressed	29.7	0.7		17.4	0.4		15.5	0.9
Sudan F/S no pressed	29.8	0.7		18.6	0.4		16.7	0.4
Klein #1 pressed	27.0	0.9		21.9	0.2		20.5	0.5
Klein #1 no pressed	27.7	1.4		19.1	0.3		17.9	0.4
Ryegrass straw	44.8	1.9		31.4	0.5		29.4	0.3
Fescue straw	43.1	1.1		31.4	0.5		30.6	1.0

¹P/S = Premium/Standard; F/S = Fine/Standard.