云南桑枝条的营养成分与饲用价值分析OA

[Objectives]The nutritional components and feed value of mulberry twigs in Yunnan Province were compare to evaluate the potential utilization of mulberry twigs in Yunnan Province as the resource of non-feed grain.[Methods]Various products including mulberry twigs,silkworm excrement,feeding residuals har-vested after autumn,and the leaves and stems of mulberry from mulberry gardens in spring in Shiyang Town,Dayao County,Yunnan Province were collected to determine the routine nutritional components and conduct a comparative evaluation based on the relative feed value(RFV)and the grading index(GI)of roughage in April 2024.[Results]4 raw materials including mulberry leaves,silkworm excrement,feeding residuals,and whole-plant mulberry had higher content of crude protein(＞15%)and RFV(＞130),while the content of crude protein in dried mulberry twigs was relatively low,ranging from 4.52%to 7.71%,and the RFV ranging from 45.93 to 84.44,indicating that the utilization value is lower(P＜0.01).The utilization value of peeled mulberry twigs was poor due to its higher degree of lignification.The content of crude protein in the 12 raw materials was in the de-creasing order of mulberry leaves＞silkworm excrement＞feeding residuals＞whole-plant mulberry(fresh)＞skin of mulberry twig(fresh)＞tender mulberry twigs(fresh)＞tips of mulberry twig(dried)＞skin of mulberry twig(dried)＞mulberry twig 1(dried twigs with skin)＞bran of mulberry twig(dried)＞mulberry twigs(peeled and fresh)＞mulberry twig 2(dried twigs with skin).The RFV was in the decreasing order of mulberry leaves＞silkworm excrement＞feeding residuals＞skin of mulberry twig(fresh)＞whole-plant of mulberry(fresh)＞ten-der mulberry twigs(fresh)＞tips of mulberry twig(dried)＞skin of mulberry twig(dried)＞bran of mulberry twig(dried)＞mulberry twig 1(dried twig s with skin)＞mulberry twig 2(dried twig s with skin)＞mulberry twigs(peeled and fresh).The GI was in the decreasing order of mulberry leaves＞silkworm excrement＞feed-ing residuals＞whole-plant of mulberry(fresh)＞skin of mulberry twig(fresh)＞tender mulberry twigs(fresh)＞tips of mulberry twig(dried)＞skin of mulberry twig(dried)＞bran of mulberry twig(dried)＞mulberry twig 1(dried twigs with skin)＞mulberry twig 2(dried twigs with skin)＞mulberry twigs(peeled and fresh).[Conclu-sions]The feed value of mulberry leaves and silkworm excrement was the highest,while that of mulberry twigs was lower.The mainly lignified twigs remained after peeling have the lowest value of utilization.It will pro-vide an important guidance for the utilization of mulberry twigs as feed.