摘要
Storage of whole-plant corn and corn grain as whole-plant corn silage (WPCS) and high-moisture corn (HMC), respectively, has been foundational for the dairy industry, with WPCS and HMC being two of the most common ingredients in the diets of modern dairy cows. A number of strategies exist to improve the quality and digestibility of WPCS and HMC, including kernel processing, microbial inoculation, and prolonged storage. However, interactions between these strategies, and how they work together to influence fermentation and starch digestibility are not well-understood. Therefore, a series of five experiments was conducted to assess how the physical and microbiological characteristics of WPCS and HMC interact with storage length to influence fermentation and starch digestibility.
The objective of the first experiment was to determine the effects of storage length and microbial inoculation with heterofermentative and homofermentative inoculants on the fermentation profile, N fractions, and ruminal in situ starch disappearance of whole-plant corn silage. The second study aimed to assess the effects of microbial inoculation and particle size on the fermentation profile, aerobic stability and ruminal in situ starch degradation of HMC ensiled for a short period. The objective of the third experiment was to analyze the effect of kernel breakage on the fermentation profile, N fractions, and ruminal in vitro starch digestibility of WPCS and ensiled corn grain. The fourth experiment aimed to assess the effect of forage processor roll gap width and storage length on fermentation, nutrient composition, corn silage processing score, and ruminal in situ starch disappearance of WPCS harvested at different maturities. The objective of the fifth and final experiment was to evaluate the effect of microbial inoculation and storage length on the fermentation profile and nutrient composition of HMC ensiled at two different DM concentrations. Overall, our results confirm that optimal moisture concentrations, aggressive kernel processing, treatment with research-proven microbial inoculants, and prolonged storage are all valuable strategies for improving the quality and digestibility of WPCS and HMC for dairy cattle. Additionally, our results suggest that these strategies may work together synergistically to optimize fermentation and starch availability.
摘要译文
作为全植物玉米和玉米籽粒的储存作为全植物玉米青贮（WPC）和高湿润的玉米（HMC），一直是乳制品行业的基础，患有WPC和HMC是其中两种最常见的成分现代奶牛的饮食。存在许多策略以改善WPC和HMC的质量和消化率，包括内核加工，微生物接种和延长储存。然而，这些策略之间的相互作用以及它们如何共同影响发酵和淀粉消化率并不熟知。因此，进行了一系列五种实验，以评估WPC和HMC的物理和微生物特性如何与储存长度相互作用以影响发酵和淀粉消化率。第一实验的目的是确定储存长度和微生物接种的影响发酵谱，N级分和瘤胃异常淀粉消失的异质敏感和良性孕制剂。第二项研究旨在评估微生物接种和粒度对发酵曲线，有氧稳定性和瘤胃原位淀粉的影响，即HMC的短时间内溶解。第三个实验的目的是分析核破裂对发酵谱，N分数和瘤胃胃的影响，玉米颗粒的瘤胃淀粉消化率。第四个实验旨在评估饲料处理器辊隙宽度和储存长度对发酵，营养成分，玉米青贮饲料加工评分的影响，以及在不同到期情况下收获的WPC的原位淀粉消失。第五和最终实验的目的是评估微生物接种和储存长度对两种不同DM浓度的HMC的发酵曲线和营养成分的影响。总体而言，我们的结果证实，最佳的水分浓度，具有研究证明的微生物孕育剂和延长储存的侵略性内核加工，以及延长的储存是提高WPC和HMC为奶牛的质量和消化率的重要策略。此外，我们的结果表明，这些策略可以协同协同协同工作以优化发酵和淀粉可用性。
Saylor, Benjamin Anthony. Strategies for Improving the Quality and Digestibility of Whole-Plant Corn Silage and High-Moisture Corn for Dairy Cattle[D]. US: The University of Wisconsin - Madison, 2021