期刊
AGRONOMY-BASEL
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/agronomy11010091
关键词
baled alfalfa silage; Lactobacillus plantarum; molasses; fermentation quality; protein fractions; in vitro digestibility
资金
- Key Technologies Research and Demonstration for Efficient Utilization of Modern Artificial Grassland [2017BY082]
- Demonstration Project of Exploitation and Utilization of High Quality Green and Rough Feed Resources [16190051]
- National Key Research and Development Program of China [2017YFD0502102]
The study improved the fermentation quality, protein quality, and digestibility of late-harvested alfalfa silage by applying Lactobacillus plantarum and molasses. The application of LP and molasses reduced pH and ammonia nitrogen contents, preserved true protein, and enhanced neutral detergent fiber digestibility. Additionally, LP mitigated the negative effects of excessive molasses on acid detergent insoluble nitrogen content.
Alfalfa sometimes cannot be harvested in time due to the rainy season. To improve the fermentation quality, protein quality and digestibility of alfalfa silage harvested late, Lactobacillus plantarum (LP) and molasses were applied in an actual production process in this study. Alfalfa harvested at the full bloom stage was ensiled with (1) distilled water (control), (2) 1 x 10(6) colony-forming units LP/g fresh matter, (3) 15 g molasses/kg fresh matter (M) or (4) LP + M (LPM) for 55 days. Alfalfa ensiled with LP and/or molasses showed significantly lower pH and ammonia nitrogen contents than the control silage (p < 0.05). All additive treatments decreased nonprotein nitrogen contents and preserved more true protein (p < 0.05). However, molasses increased the acid detergent insoluble nitrogen content in the protein fractions (p < 0.05). The LP significantly improved the maximal cumulative gas production and the maximum gas production rate (p < 0.05) in the in vitro trial. Finally, both LP and molasses improved the neutral detergent fiber digestibility of the alfalfa silage (p < 0.05). The LP and molasses improved fermentation quality and digestibility and preserved more true protein in baled alfalfa silage harvested late in an actual production process. The LP utilized the excessive molasses and partially ameliorated its negative effects of causing higher acid detergent insoluble nitrogen content.
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