Abstract
The study was conducted to screen high 1,2-propanediol produced by Lactobacillus buchneri strains, isolated from baled silages stored for 1 or 2 years, and to evaluate their effects on fermentation quality and aerobic stability of whole-plant corn silage. In total, 31 L. buchneri strains were isolated from alfalfa, whole-plant corn and oat silages. Based on growth performance and 1,2-propanediol and acetic acid production, two strains, L. buchneri 9-2 and L. buchneri 10-1, from alfalfa silage, were further assessed in an ensiling trial on whole-plant corn. The corn silage inoculated with L. buchneri 9-2 or L. buchneri 10-1 had a higher concentration of 1,2-propanediol (34.7 or 34.6 g/kg dry matter (DM)) and acetic acid (47.2 or 45.9 g/kg DM) in comparison with L. buchneri 40788 (reference strain) treated silage (19.5 and 35.9 g/kg DM) after 90 d of fermentation. In addition, these two strains performed better in improving silage aerobic stability relative to control and L. buchneri 40788. The results above indicated that L. buchneri 9-2 and L. buchneri 10-1 could be candidate strains to increase 1,2-propanediol and acetic acid concentrations and improve the aerobic stability of whole-plant corn silage.
Highlights
The ensiling process is characterized by the fermentation of fresh forage initiated by lactic acid bacteria (LAB) under anaerobic conditions
Whole-plant corn silage has become more popular because it has great nutritional value, high concentration in water-soluble carbohydrates (WSC), which makes it suitable for the LAB fermentation, and it has good palatability [7]
Neutral detergent fiber (NDF) concentration was determined following the method described by Van Soest et al [31] and acid detergent fiber (ADF) concentration was determined following the method described by Robertson and Van Soest [32] using an Ankom 200 fiber analyzer (Ankom Technology Corp., Fairport, NY, USA)
Summary
The ensiling process is characterized by the fermentation of fresh forage initiated by lactic acid bacteria (LAB) under anaerobic conditions. During this process, water-soluble carbohydrates (WSC) are converted into organic acids through LAB activity to promote forage conservation and produce distinctive fragrance and acid flavor that are attractive to ruminant animals [1–3]. Ensiling is the most effective technique for fresh corn preservation as high-quality forage [5,6]. Whole-plant corn silage has become more popular because it has great nutritional value, high concentration in WSC, which makes it suitable for the LAB fermentation, and it has good palatability [7]. Improvement in aerobic stability of corn silage is a conventional but constant concern for making high-quality and safe silage
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