Enhanced feeding value of high-moisture-corn in swine liquid feeding

猪的液体饲养在北美是一项新兴技术。 根据在欧洲进行的研究，液体喂养比传统的干喂养有许多潜在的好处，例如改善肠道健康，减少沙门氏菌的流行，使用来自食品和酒精行业的廉价副产品，灵活性和易于饮食制备和交付，以及提高含有酶和有益细菌的成分的喂养价值。 关于以高水分玉米（HMCorn）为基础的饲料饲喂液体猪的益处的信息很少，这很重要，因为HMCorn是加拿大中部猪液体饲养的主要驱动因素之一。 本研究推测，采用酶法浸泡和接种菌剂控制发酵，可提高高分子玉米对液态饲粮猪的饲用价值。 将进行实验以确定使用酶（植酸酶、淀粉酶、蛋白酶）浸泡HMCorn以改善猪在基于HMCorn的日粮中的营养利用的功效，以及使用乳酸（LA）细菌辅助发酵、减少病原负荷和增强猪的消化功能。 在最先进的猪液体饲喂装置中，在对仔猪和生长肥育（G/F）猪进行体内研究之前，将基于受控浸泡（使用不同来源和水平的植酸酶和淀粉酶）和发酵（接种不同类型和组合的产LA细菌），使用微发酵装置进行研究。 这些发现将有助于减少养猪对环境的影响，减少对饲料抗生素的依赖（从而提高猪肉安全性和动物福利），并降低饲养成本。此外，一些结果可以转化为提高猪饲喂干饲料的性能。

Liquid feeding of swine is an emerging technology in North America.  Based on studies conducted in Europe, liquid feeding has many potential benefits over conventional dry-feeding, such as improved gut health, reduced Salmonella prevalence, use of inexpensive co-products from the food and alcohol industry, flexibility and ease of diet preparation and delivery, and enhancement of the feeding value of ingredients with enzymes and beneficial bacteria.  There is little information on the benefits of liquid feeding pigs with high moisture corn (HMCorn)-based diets, which is important because HMCorn is one of the main drivers of swine liquid feeding in central Canada.  It is hypothesized that steeping with enzymes and controlled fermentation with bacterial inoculants can improve the feeding value of HMCorn for pigs fed liquid diets.  Experiments will be conducted to determine the efficacy of using enzymes (phytase, amylase, proteases) for steeping of HMCorn to improve nutrient utilization by pigs in HMCorn-based diets, and to use lactic acid (LA) bacteria to aid fermentation, reduce pathogenic load and enhance digestive function in pigs.  Dietary treatments established will be based on controlled steeping (using different sources and levels of phytase and amylase) and fermentation (inoculation with different types and combinations of LA producing bacteria) with studies using micro-fermentation units, prior to conducting in vivo study studies with starter and growing-finishing (G/F) pigs in a state-of-the-art swine liquid feeding unit.  The findings will contribute to reduced environmental impact of pig production, reduced reliance on in-feed antibiotics (and thus improved pork safety and animal welfare), and reduced feeding costs. Moreover, some outcomes could be translated to improve the performance of pigs fed dry diets.