Application of different proportions of sweet sorghum silage as a substitute for corn silage in dairy cows

作者：Xiaokang Lv, Liang Chen, Chuanshe Zhou, Guijie Zhang, Jingjing Xie, Jinhe Kang, Zhiliang Tan, Shaoxun Tang, Zhiwei Kong, Zixin Liu, Zhiyan Du · 发表于：Food Science & Nutrition · 年份：2023 · DOI：10.1002/fsn3.3347 · 被引用次数：23 · 研究领域：Ruminant Nutrition and Digestive Physiology、Crop Yield and Soil Fertility、Livestock Management and Performance Improvement

Abstract This experiment explored the effects of different proportions of sweet sorghum silage as a substitute for corn silage on dry matter intake (DMI), milk yield, milk quality, apparent digestibility, rumen fermentation parameters, serum amino acid profile, and rumen microbial composition of dairy cows. A total of 32 mid‐lactation Holstein dairy cows with similar body weights and parities were randomly divided into four treatments: 100% corn silage +0% sorghum silage (CON), 75% corn silage +25% sorghum silage (CS1), 50% corn silage +50% sorghum silage (CS2), and 25% corn silage +75% sorghum silage (CS3). The milk yield was increased (linear, p = .048) as the proportion of sweet sorghum increased. Linear ( p = .003) and quadratic ( p = .046) increased effects were observed in milk fat as corn silage was replaced with sorghum silage. Compared with the CON diet group, the CS2 and CS3 diet groups had lower dry matter (DM) (linear, p < .001), ether extract (EE) (linear, p < .001), and gross energy (GE) (linear, p = .001) digestibility of the dairy cows. The ruminal fluid aspartate (Asp) level decreased (linear, p = .003) as the proportion of sweet sorghum increased. Linear ( p < .05) and quadratic ( p < .05) increased effects were observed for the contents of threonine (Thr), glycine (Gly), valine (Val), leucine (Leu), tyrosine (Tyr), and histidine (His) in rumen fluid with the replacement of corn silage with sorghum silage. Cows fed the CS3 diet had greater Faecal...