The aim of this experiment was to study the nutritional value,molecular structure characteristics and in vitro rumen degradation rate in different parts of Sesbania cannabina(including leaves,stems,roots and whole plant),and to provide basic data for the development of high-quality roughage resources for ruminants.The nutrient contents in leaves,stems,roots and whole plant of Sesbania cannabina were analyzed according to the preliminary nutrient analysis and Cornell Net Carbohydrate and Protein System(CNCPS).Meanwhile,the molecular structure of different parts of Sesbania cannabina was analyzed by Fourier transform infrared spectroscopy(FTIR)technology.Finally,the rumen simulated fermentation was carried out in vitro,and the degradation rate and gas production of different parts of Sesbania cannabina were analyzed.The results showed as follows:1)there were significant differences in protein composition and secondary structure spectral param-eters among different parts of Sesbania cannabina(P＜0.05).Among them,the protein content in leaves was higher,while that in roots was lower.The peak height and peak area of amide Ⅰ and amide Ⅱ and β-sheet peak area in leaves were higher,while the peak height and peak area of amide Ⅰ in stems were lower.2)The carbohydrate composition and molecular structure spectral parameters in different parts of Sesbania cannabina were significantly different(P＜0.05).The contents of neutral detergent fiber(NDF),acid detergent fiber(ADF)and acid detergent lignin(ADL)were higher in roots,but lower in leaves;the peak height and peak area of total carbohydrate in roots were higher.In addition,there was a certain correlation between the protein and carbohydrate composition of Sesbania cannabina and its molecular structure.3)The in vitro fermentation degradation rates of crude protein and dry matter in leaves of Sesbania cannabina were the highest,which were significantly higher than those in whole plant,stems and roots(P＜0.05);the 48 h total gas production of leaves was significantly higher than that of stems and roots(P＜0.05).In conclusion,the nutritional value in different parts of Sesbania cannabina has a certain correlation with its molecular structure.Among them,the nutrient value and utilization rate of leaves and stems are relatively high,while the nutrient value and utilization rate of roots are low.[Chinese Journal of Animal Nutrition,2024,36(5):3386-3400]
维普
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