玉米植株剪切力与其饲料特性变化规律和相互关系的研究

doi:10.3864/j.issn.0578-1752.2012.03.013

Abstract

Abstract: 【Objective】 The objectives of this study were to investigate the changing laws and the relationships between shearing force and nutritional ingredient of growing maize plant, and further prove confirmation that shearing force is one way of evaluating nutritional ingredient of forage. 【Method】 The shearing force, linear density and chemical compositions of leaf, pericladium and stem of three varieties of maize, each of 24 plants, were measured at 5-day intervals during the 78-108th d. Meanwhile, three sheep fitted with permanent cannulas in rumen were used to determine in situ degradability in 48 h of the nutrients of three chief vegetable organs at the milk stage, dough stage and physiological maturity stage. 【Result】 The results showed that linear density and shearing force of stem linear increased with maize growth and there was a difference among varieties (P＜0.05). Shearing force of pericladium linear increased (P＜0.05), and the linear density of leaf and pericladium linear reduced (P＜0.01). There was a significant correlation between shearing force with linear density of pericladium and stem (P＜0.05). The contents of DM, OM, NDF, ADF and GE in pericladium and stem on the base of fresh matter linear increased, contents of CP linear reduced, there was a difference among varieties (P＜0.05), and the contents of DM, OM, NDF and ADF in leaf had a linear increase (P＜0.05), during the 78-108th d. of maize growth. A significant correlation was found between shearing force and chemical compositions of pericladium and stem (P＜0.05). In situ degradability of leaf decreased with increasing shearing force, and there was a difference among the three chief vegetable organs (P＜0.05). 【Conclusion】 The shearing force, chemical compositions and in situ degradability of maize plant showed a dynamic change during the 78-108th d. stage. Shearing force can be employed to predict the chemical composition and utilization of growing maize plant, but different organs and varieties should be taken into consideration.

Key words: maize plant, shearing force, chemical compositions, in situ degradability, relationships

WANG Zhao-Feng, YANG Zai-Bin, YANG Wei-Ren, ZHANG Gui-Guo, JIANG Shu-Zhen, ZHANG Chong-Yu, LIU Li, CUI Xiu-Mei. Changing Laws and Correlations of Shearing Force and Feed Characteristics of Maize Plant[J].Scientia Agricultura Sinica, 2012, 45(3): 509-521.

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