防腐剂
塑料薄膜
饲料
随机区组设计
园艺
动物科学
青贮饲料
苜蓿
化学
水分
数学
农学
食品科学
材料科学
生物
复合材料
图层(电子)
作者
W.K. Coblentz,M.S. Akins,Burney A. Kieke
出处
期刊:Applied animal science
[American Registry of Professional Animal Scientists]
日期:2021-10-01
卷期号:37 (5): 505-518
被引量:1
标识
DOI:10.15232/aas.2021-02193
摘要
The objectives for this study were to assess the storage characteristics of relatively dry, mixed-species forage preserved with a propionic-acid-based preservative, or by wrapping with 7 layers of plastic film as baled silage. The experimental design was a randomized complete block with a 2 × 2 factorial arrangement of treatments, which included application of a propionic-acid-based preservative at 0.27 ± 0.025% of wet bale weight (yes or no), and wrapping in 7 layers of stretch film (yes or no). A total of 33 round bales (1.2 × 1.5 m) containing 66% legumes (alfalfa; Medicago sativa L.) and 31% grasses (orchardgrass; Dactylis glomerata L.) were produced at 25.8 ± 2.20% moisture. This number of bales were sufficient for 8 complete field blocks (replications), plus one additional bale assigned to receive preservative, but no plastic wrap. Bales were positioned on wooden pallets for 84 d before final sampling. Internal bale temperatures were monitored daily during the 84-d storage period. The preservative had no clear statistical effect on any measure of spontaneous heating (P ≥ 0.086). In contrast, application of plastic film yielded reduced maximum internal bale temperatures (41.5 vs. 61.6°C; P < 0.001) and total heating degree days >30°C (111 vs. 732; P < 0.001) when compared with unwrapped bales. These reductions in spontaneous heating also were reflected in measures of nutritive value, where NEl was reduced in unwrapped bales by 9.2% (P < 0.001), but only by a calculated 1.4% (P > 0.05) in wrapped bales compared with pre-storage values. The application of plastic film onto relatively dry mixed-species forages proved extremely effective in reducing spontaneous heating during storage, as well as minimizing nutrient losses.
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