Jung H G, Vogel K P
J Anim Sci. 1986 Jun;62(6):1703-12. doi: 10.2527/jas1986.6261703x.
One-hundred-ninety-four grass samples, representing eight species, were used to determine the relationships of in vitro forage dry matter, cell wall, hemicellulose and cellulose digestibilities with lignin concentration. Linear regressions indicated that dry matter digestion was inhibited to a lesser degree (P less than .05) by lignin concentration than was cell wall digestion. Results for linear regressions of hemicellulose and cellulose digestibilities as functions of lignin concentration showed a greater (P less than .05) effect of lignin on cellulose digestion. Smooth bromegrass and switchgrass were collected at both Clay Center and Mead, NE; for all digestibility measures, the Clay Center samples gave stronger (P less than .05) negative correlations with lignin. A comparison of linear and curvilinear models indicated that, for all digestion measurements, the curvilinear model was a better (P less than .05) description of relationships with lignin concentration. For all digestibility measures, lignin's inhibiting effect declined at higher lignin concentrations. The curvilinear models did not show significant differences among the digestibility measures for effect of lignin. The demonstration that the forage digestibility response to lignin's inhibitory effect is curvilinear in nature suggests that the mechanism of lignin's inhibition is complex.
194份代表8个物种的草样被用于确定体外牧草干物质、细胞壁、半纤维素和纤维素消化率与木质素浓度之间的关系。线性回归表明，与细胞壁消化相比，木质素浓度对干物质消化的抑制程度较小（P小于0.05）。半纤维素和纤维素消化率作为木质素浓度函数的线性回归结果表明，木质素对纤维素消化的影响更大（P小于0.05）。光滑雀麦和柳枝稷在克莱中心和内布拉斯加州米德均有采集；对于所有消化率指标，克莱中心的样本与木质素的负相关性更强（P小于0.05）。线性模型和曲线模型的比较表明，对于所有消化率测量，曲线模型能更好地（P小于0.05）描述与木质素浓度的关系。对于所有消化率指标，在较高木质素浓度下，木质素的抑制作用会下降。曲线模型在木质素对消化率影响的指标之间未显示出显著差异。牧草消化率对木质素抑制作用的响应本质上是曲线的这一证明表明，木质素抑制的机制很复杂。
