Kinetics of transit and degradation of the fiber from guinea grass silages enriched with waste from soybean pre-cleaning

The objective was to study the kinetics of transit and degradation of the fiber from guinea grass and the waste from soybean pre-cleaning (WSPC), ensiled with different proportions of mass (0, 100, 150, and 200 g WSPC/kg total mass). Four crossbred (Gyr × Holstein), fistulated cattle with an average body mass of 400±50 kg were organized in a 4 × 4 Latin square experimental design. The fiber utilized in the study of the transit kinetics was stained with chromium mordant, whereas the in situ technique was adopted for the degradation kinetics. The level of inclusion of WSPC only affected the true digestibility and the mean retention time. The addition of waste from soybean pre-cleaning to the silage of guinea grass is beneficial, in terms of kinetics of digestion and passage, at up to levels close to 100 g/kg, because after this quantity the fiber digestion and passage in and through the reticulo-rumen are impaired and there may be alterations in the ruminal environment that will affect the use of silage by animals.

本研究旨在探究以不同质量配比（0、100、150及200 g WSPC/kg总质量）将几内亚草纤维与大豆预清选废弃物（WSPC）混合青贮后，体系内纤维的转运与降解动力学特性。选取4头平均体重为400±50 kg的（古尔牛×荷斯坦牛）杂交瘘管牛，采用4×4拉丁方试验设计开展试验。本研究中转运动力学研究所用的纤维经铬媒染剂染色标记，降解动力学测定则采用原位技术。WSPC的添加水平仅对真消化率与平均停留时间产生影响。在几内亚草青贮饲料中添加大豆预清选废弃物，当其添加量接近100 g/kg时，对饲料的消化与转运动力学具有积极作用；当添加量超过该水平后，纤维的消化过程及其在网胃-瘤胃内的转运过程将受到抑制，且瘤胃内环境可能发生改变，进而影响动物对青贮饲料的利用效率。