Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (15): 3137-3146.doi: 10.3864/j.issn.0578-1752.2012.15.016

• ANIMAL SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Correlations of Shearing Force and Feed Nutritional Characteristics of Crop Straws

 CUI  Xiu-Mei, YANG  Zai-Bin, YANG  Wei-Ren, ZHANG  Gui-Guo, JIANG  Shu-Zhen, LIU  Li, WANG  Zhao-Feng   

  1. 1.山东农业大学动物科技学院，山东泰安 271018
    2.济宁市畜牧兽医局，山东济宁 272000
    3.山东省畜牧总站，济南 250022
  • Received:2011-11-28 Online:2012-08-01 Published:2012-02-17

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Abstract: 【Objective】This experiment was conducted to study the correlations of shearing force and feed characteristics (morphological characteristic, chemical compositions and in situ digestibility) of corn stalk, wheat straw and rice straw.【Method】Shearing force was measured with portable shear force apparatus when the corp straws were harvested. Meanwhile, diameter, thickness, linear density (weight per unit length of stem), and chemical composition of straws were measured. Nylon bags and three small-tail Han sheep were used to determine the in situ digestibility of dry matter (DM), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of corn stalk, wheat straw and rice straw. 【Result】 The results showed that there were significant differences of shearing force, morphology indicators (linear density, diameter, and thickness) and shearing force/linear density of the three straws at harvest-time (P＜0.05). There were positive relationships between linear density, diameter, and thickness and their shearing force of the three straws (P＜0.001). Linear density had the highest sensitivity for shearing force of three straws. Moreover, linear density of corn stalk had the highest sensitivity for its shearing force (P＜0.05). There were different degrees of correlation between nutritional ingredient and shearing force (P＜0.05). In addition, in situ digestibility of nutritional ingredient (DM and NDF) was related to shearing force with different degrees. Shearing force reflects the highest degree of NDF digestibility of corn stalk. Shearing force is the preferable means to predict the nutrients and its rumen degradability of corn stalk and rice straw. 【Conclusion】There were correlations between shearing force and feed characteristics of crop straws. Nutrient content, morphological index and rumen degradability of nutrients (DM, NDF and ADF) can be predicted by shearing force varying degrees. Shearing force can be used as an indicator of nutritive value of corn stalk and rice straw more suitably. Shearing force can be employed to predict the nutritive value of corp straws, while take different varieties into consideration for their sensitivity variance.

Key words: crop straws, shearing force, morphological characteristic, nutrition components, in situ digestibility, correlativity

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