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Asian-Australasian Journal of Animal Sciences 2013;26(10): 1466-1473.
DOI: https://doi.org/10.5713/ajas.2013.13010    Published online October 1, 2013.
Variation and Correlation of Shearing Force with Feed Nutritional Characteristics of Wheat Straw
X. M. Cui, Z. B. Yang*, W. R. Yang, S. Z. Jiang, G. G. Zhang, L. Liu1, B. R. Wu, Z. F. Wang2
College of Animal Science and Technology, Shandong Agricultural University, Tai’an, Shandong, 271018, China
Correspondence:  Z. B. Yang, Tel: +86-0538-824-1257, Fax: +86-0538-824-9371, Email: yzb204@163.com
Received: 4 January 2013   • Revised: 9 May 2013   • Accepted: 3 April 2013
This experiment was conducted to study the variation laws and correlations of shearing force and feed characteristics including morphological characteristic, chemical composition and in situ degradability of wheat straw. Feasibility of evaluating the nutritional value of wheat straws with shearing force values was analyzed in this study. Six hundred wheat straw plants (Jimai 22) were randomly selected and placed in a cool and ventilated place. Samples were collected in the 1st, 15th, 30th, 45th, 60th d after harvest to measure shearing force, morphological characteristic, nutritional composition. Rumen degradation of dry matter (DM), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of wheat straws were determined by the nylon bags method. The results demonstrated that linear and quadratic effects of storage time on all the tested morphological characteristics were significantly correlative (p<0.01). As storage time goes on, all the tested nutrients and their rumen degradations of wheat straw was linearly (p<0.01) and quadratic (p<0.01) correlative except ADF content and rumen degradation of ADF. Significant correlations were determined in linear effect of shearing force on morphological characteristics (p<0.01), and linear density and diameter were a more sensitive predictor than stem thickness for shearing force. There were strong correlations between storage time and all the measured physical characteristics (shearing force, morphological characteristics and shearing force standardized by morphological characteristics) (p<0.01). Nutrition compositions were linearly correlative with shearing force and standardized shearing force (p<0.01). The linear correlation between rumen degradation of DM and NDF and shearing force and standardized shearing force were evident (p<0.01). In conclusion, shearing force, nutrition compositions and their rumen degradation of wheat straw were still dynamic with storage time after harvest. Correlation could be found between shearing force and nutritional characteristics of wheat straw. Nutrient content, morphological index and rumen degradation of DM and NDF could be predicted by changes in shearing force. Shearing force should be applied according to a standardized storage time when it is used to forecast the feed value of wheat straws.
Keywords: Wheat Straw, Shearing Force, Morphological Characteristic, Nutrient Compositions, In situ Degradability, Correlativity

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