Jiao Ting, Lei Zhaomin, Wu Jianping, Li Fei, Casper David P, Wang Jianfu, Jiao Jianxin
College of Grassland Science, Key Laboratory of Grassland Ecosystem, Gansu Agricultural University, Lanzhou 730070, China.
College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China.
Anim Biosci. 2021 Nov;34(11):1776-1783. doi: 10.5713/ab.20.0804. Epub 2021 Mar 10.
This project aimed to evaluate the effects of both different additives and filling methods on nutritive quality, fermentation profile, and in situ digestibility of whole plant corn silage.
Whole plant corn forage harvested at 26.72% dry matter (DM) was chopped and treated with two filling methods, i) fill silos at one time (F1), ii) fill silos at three times (F3), packing samples into one/three silo capacity at the first day, another one/three capacity at the second day, then one/three at the third day, three replicates. For each replicate, samples were treated with three additives, i) control (CTRL, no additive), ii) Sila-Max (MAX, Ralco Nutrition Inc., Marshall, MN, USA), and iii) Sila-Mix (MIX, Ralco Nutrition Inc., USA). With three replicates of each secondary treatment, there were nine silos, 54 silos in total. Each silo had a packing density of 137.61 kg of DM/m3. All silos were weighed and stored in lab at ambient temperature.
After 60 d of ensiling, all items showed good silage fermentation under MAX filled one time or three times (p<0.01). Higher silage quality for all additives was obtained at filling one time than that filled three times (p<0.01). The highest DM and lowest DM loss rate (DMLR) occurred to MAX treatment at two filling methods (p<0.01); Digestibility of acid detergent fiber, neutral detergent fiber (NDF), and curde protein had the same results as silage quality (p<0.01). Yield of digestible DM and digestible NDF also showed higher value under MAX especially for filling one time (p<0.05).
All corn silages showed good fermentation attributes (pH<4.0). The forage filled one time had higher silage quality than that filled three times (p<0.01). MAX with homofermentative lactic acid bacteria enhanced the lactic acid fermentation, silage quality and nutrient digestibility, and so improved the digestible nutrient yield.
本项目旨在评估不同添加剂和装填方法对全株玉米青贮饲料营养品质、发酵特性及原位消化率的影响。
将干物质含量为26.72%的全株玉米饲料切碎，采用两种装填方法进行处理，即：i）一次性装满青贮窖（F1）；ii）分三次装满青贮窖（F3），第一天装入青贮窖容量的三分之一，第二天装入另外三分之一，第三天装入剩余的三分之一，共设三个重复。对于每个重复，样品分别用三种添加剂处理，即：i）对照（CTRL，不添加添加剂）；ii）西拉麦克斯（MAX，美国明尼苏达州马歇尔市Ralco Nutrition公司）；iii）西拉混合剂（MIX，美国Ralco Nutrition公司）。每个二级处理设三个重复，共九个青贮窖，总计54个青贮窖。每个青贮窖的装填密度为137.61千克干物质/立方米。所有青贮窖称重后在实验室常温下储存。
青贮60天后，在MAX一次性或三次装填的情况下，所有指标均显示青贮发酵良好（p<0.01）。所有添加剂在一次性装填时的青贮品质均高于三次装填（p<0.01）。两种装填方法下，MAX处理的干物质含量最高，干物质损失率（DMLR）最低（p<0.01）；酸性洗涤纤维、中性洗涤纤维（NDF）和粗蛋白的消化率与青贮品质结果相同（p<0.01）。可消化干物质和可消化NDF的产量在MAX处理下也较高，尤其是一次性装填时（p<0.05）。
所有玉米青贮饲料均表现出良好的发酵特性（pH<4.0）。一次性装填的饲料青贮品质高于三次装填（p<0.01）。含有同型发酵乳酸菌的MAX增强了乳酸发酵、青贮品质和养分消化率，从而提高了可消化养分产量。
