Beuvink J M, Kogut J
DLO-Research Institute for Livestock Feeding and Nutrition (IVVO-DLO), Lelystad, The Netherlands.
J Anim Sci. 1993 Apr;71(4):1041-6. doi: 10.2527/1993.7141041x.
Time course measurements of in vitro gas production of feedstuffs incubated with buffered ruminal fluid give information about the rate at which the feed is fermented. To compare gas production kinetics from different feeds, a mathematical model was needed to describe the data. We investigated several existing models (exponential, logistic, Gompertz, Richards, Schnute), fitting them to 50 gas production curves obtained with grass silages. None of them gave a satisfactory description of the data. A new model was developed (modified Gompertz model; mGom) that basically divided gas production into two fractions, one arising from rapidly fermentable feed components and the other from slowly fermentable feed components. Residual mean squares (RMS) for the mGom model were lower (P < .05; n = 50) than the RMS for the other models. A good statistical comparison of kinetic gas production data is made possible with the mGom model.
对与缓冲瘤胃液一起孵育的饲料进行体外产气的时间进程测量，可以获得有关饲料发酵速率的信息。为了比较不同饲料的产气动力学，需要一个数学模型来描述数据。我们研究了几个现有模型（指数模型、逻辑模型、冈珀茨模型、理查兹模型、施努特模型），并将它们与用青贮饲料获得的50条产气曲线进行拟合。没有一个模型能对数据给出令人满意的描述。我们开发了一个新模型（修正冈珀茨模型；mGom），该模型基本上将产气分为两部分，一部分来自快速可发酵的饲料成分，另一部分来自缓慢可发酵的饲料成分。mGom模型的剩余均方（RMS）低于其他模型（P < 0.05；n = 50）。mGom模型使得对产气动力学数据进行良好的统计比较成为可能。
