Physical and chemical properties of 11 feeds including 3 forages; Alfalfa Hay (AH), Corn Silage (CS), Barley Silage (BS) and 8 Non-Forage Fiber Sources (NFFS); Soy Hull with Low (LSH) and High Seed (HSH), Cotton Seed Hull (CSH), Pistachio Hull (PH), Ground Peanut Hull (GPH), Sunflower Hull (SFH), Wheat Bran (WB) and Sugar Beet Pulp (SBP) were investigated. NFFS had a high bulk density (BD, 0.578-0.243; g mL-1) and ADL content and low water holding capacity (WHC, g/insoluble DM). Soluble DM (SDM) and soluble OM (SOM, g L-1) was low for SFH (0.7 and 0.62) and high for pH (6.25 and 4.19). Among all feed WHC had highest correlation with ADF and ash, while for NFFS, correlation was noted between WHC with BD and BC. Among all feeds BD had highest correlation with the NDF and NFC. For NFFS, BD had the highest correlation with ADF and SOM. Among all feeds BC had significant correlation with ash and Sash and pH had significant correlation with soluble fractions. In NFFS, significant correlation was noted between BC with ash, cell wall constituents, soluble fractions and pH. When NFFS were used for providing best predictive models, the r2-values were increased for most of presented models compare with all feeds. The best models were that predicted SOM and BC in NFFS (r2 = 0.995). Based on the results it appears that the type of feeds is critical factor influencing the relationship between physical and chemical parameters.

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