营养元素对禾本科牧草体外消化率影响的相对重要性分析OA

Forage serves as the primary component of ruminant diets,and its digestibility directly deter-mines the level of nutritional intake and production performance of animals,there by influencing the eco-nomic efficiency of livestock operations and the efficiency of resource utilization.To evaluate the relative importance of nutrients affecting forage digestibility,this study focused on eight typical grass species from the Hulunbuir Grassland in Inner Mongolia.A combination of statistical methods,including stepwise regression analysis,variance decomposition,principal component analysis,and dominance analysis,was employed to systematically compares the relative importance of macronutrients such as phosphorus(P),potassium(K),calcium(Ca),carbon(C),nitrogen(N),and sodium(Na),as well as micronutrients includ-ing iron(Fe),manganese(Mn),iodine(I),and selenium(Se)in influencing the digestibility of grass forage.The results showed that the variance contributions of macronutrients,micronutrients,and their interactions to the variation in gramineous forage digestibility were 36.61%,22.38%,and 39.62%,respectively,indicating that both nutrient categories and their interactive effects significantly influence digestibility,with macronutrients contributing slightly more than micronutrients.Among macronutrients,the relative impor-tance of individual elements on forage digestibility ranked as Ca>C>K>N>Na>P,with Ca and C play-ing particularly prominent roles.Among micronutrients,the relative importance followed the order of Mn>I>Se>Fe,with Mn exhibiting the strongest explanatory power.