外源硫酸铵对再生糯高梁青贮发酵特性及饲用安全性的影响

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中图分类号：S816.53 文献标识码：A 文章编号：1007-0435（2026）04-1546-11

Abstract：To investigate the regulatory efects of exogenous ammoniumsulfateon the silage qualityand hydrogen cyanide（HCN） degradation of regrowth waxy sorghum [Sorghum bicolor （L.）Moench]，a 6O-day silage experiment was conducted with three addition levels of ammonium sulfate （0% ， 0.3% ，and 0.5% of dry mater）.Fermentation characteristics，nutritional composition，feeding value，and HCN dynamics were continuously monitored.Principal component analysis （PCA）and redundancy analysis （RDA） were employed for comprehensive evaluation. The results showed that ammonium sulfate significantly improved both nutritional quality and silage safety. The 0.5% ammonium sulfate treatment increased crude protein by 12.3% ，while neutral detergent fiber（NDF） and acid detergent fiber（ADF） decreased to 43.82% and 27.60% ，respectively. Lactic and acetic acid concentrations increased by 35.7% and 28.4% ，acceleratingacidification（ pH<4.2 within 7 days） and suppressing undesirable microorganisms. HCN degradation rate increased by 40% between 7 and 15 days，with final residual content below 170mg⋅kg-1 and a degradation rate of 53% after 60 days. Feeding performance was also enhanced，with relative feed value（RFV） and relative forage quality （RFQ） reaching l6O and 18O，respectively. Overall，ammonium sulfate at 0.4%-0.6% of dry matter effectively improved silage fermentation，nutritional quality，and safety，meeting the standards for high-quality forage （RFV > 145，H ICN<200mg⋅kg-1 and providing a scientific basis for developing the“grain-forage dual-purpose" sorghum production model.

Key words：Ratooning sorghum;Ammonium sulfate;Silage quality;Hydrogen cyanide; feeding value

近年来，随着我国畜牧业产业结构调整和转型升级[1]，对优质饲草资源的需求呈现出爆发式增长[2。（剩余19032字）