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http://dx.doi.org/10.5713/ajas.17.0077

Dynamics of shearing force and its correlations with chemical compositions and in vitro dry matter digestibility of stylo (Stylosanthes guianensis) stem  

Zi, Xuejuan (Institute of Tropical Agriculture and Forestry, Hainan University)
Li, Mao (Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences)
Zhou, Hanlin (Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences)
Tang, Jun (Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences)
Cai, Yimin (Japan International Research Center for Agricultural Sciences (JIRCAS))
Publication Information
Asian-Australasian Journal of Animal Sciences / v.30, no.12, 2017 , pp. 1718-1723 More about this Journal
Abstract
Objective: The study explored the dynamics of shearing force and its correlation with chemical compositions and in vitro dry matter digestibility (IVDMD) of stylo. Methods: The shearing force, diameter, linear density, chemical composition, and IVDMD of different height stylo stem were investigated. Linear regression analysis was done to determine the relationships between the shearing force and cut height, diameter, chemical composition, or IVDMD. Results: The results showed that shearing force of stylo stem increased with plant height increasing and the crude protein (CP) content and IVDMD decreased but fiber content increased over time, resulting in decreased forage value. In addition, tall stem had greater shearing force than short stem. Moreover, shearing force is positively correlated with stem diameter, linear density and fiber fraction, but negatively correlated with CP content and IVDMD. Conclusion: Overall, shearing force is an indicator more direct, easier and faster to measure than chemical composition and digestibility for evaluation of forage nutritive value related to animal performance. Therefore, it can be used to evaluate the nutritive value of stylo.
Keywords
Goat; Stylo Stem; Shear Force; Chemical Composition; In vitro Dry Matter Digestibility;
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