Wheat silage partially replacing oaten hay exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs

作     者：Zhao-Yang Cui Wen-Juan Li Wei-Kang Wang Qi-Chao Wu Yao-Wen Jiang Ailiyasi Aisikaer Fan Zhang He-Wei Chen Hong-Jian Yang Zhao-Yang Cui;Wen-Juan Li;Wei-Kang Wang;Qi-Chao Wu;Yao-Wen Jiang;Ailiyasi Aisikaer;Fan Zhang;He-Wei Chen;Hong-Jian Yang

作者机构：State Key Laboratory of Animal NutritionCollege of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China 

出 版 物：《Animal Nutrition》 (动物营养（英文版）)

年 卷 期：2023年第15卷第4期

页      面：332-340页

核心收录：

学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 09[农学] 

基　　金：the financial support of the project Sheep Feed Evaluation and Feed Table Establishment from the Ministry of Agriculture and Rural Affairs of China 

主　　题：Wheat silage Oaten hay Growth performance Nutrient digestibility Rumen fermentation Feedlot lamb 

摘      要：This study aimed to investigate the feeding effect of wheat silage on growth performance,nutrient digestibility,rumen fermentation,and microbiota composition in feedlot ***-four male crossbred Chinese Han lambs(BW=27.8±0.67 kg,3 months of age)were randomly assigned to four ration groups with wheat silage replacing 0%(WS0),36%(WS36),64%(WS64),and 100%(WS100)of oaten hay on forage dry matter *** concentrate-to-forage ratio was 80:20 and the feeding trial lasted 52 *** wheat silage inclusion linearly decreased dry matter intake by 4%to 27%(P0.01).However,increasing the wheat silage replacement of oaten hay by no more than 64%improved the feed efficiency by 14%as noted by the feed-to-gain ratio(P=0.04).Apparent digestibility of organic matter(P0.01),neutral detergent fibre(P=0.04)and acid detergent fibre(P0.01)quadratically *** nitrogen(P=0.01)decreased while microbial protein production(P0.01)increased with the increase of wheat silage *** volatile fatty acids concentration increased quadratically with the increase of wheat silage inclusion(P0.01),and the highest occurred in *** molar proportion of acetate(P0.01)and acetate-to-propionate ratio(P=0.04)decreased while butyrate(P0.01)and isovalerate(P=0.04)*** wheat silage inclusion increased the Firmicutes-toBacteroidota ratio by 226%to 357%,resulting in Firmicutes instead of Bacteroidota being the most abundant *** relative abundance of cellulolytic Ruminococcus numerically increased but that of amylolytic Prevotella(P0.01)decreased as increasing wheat silage *** together,increasing wheat silage replacement of oaten hay by no more than 64%exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs due to the change of Firmicutes-to-Bacteroidota ratio in the rumen.