Recompacted corn silage in different densities

• Grant number: 18/16890-9
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): October 01, 2018
• Effective date (End): January 29, 2020
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Pastures and Forage Crops
• Principal Investigator: Leandro Coelho de Araujo
• Grantee: Camila de Oliveira Rocha
• Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
• Associated scholarship(s): 19/03285-2 - Starch in maize silages re-ensiled at different densities with or without microbial inoculant, BE.EP.IC

Abstract

The aim of this project is to determine the bromatological composition and to estimate losses and recuperation of dry matter in different ways to create corn silos and evaluate the impact of different densities and of addition of commercial additives of bacteria. The silage is quickly compacted after being retired of the trench-silo full which was full of silage of entire plants of corn none inoculated. The experience is done with an experimental silo from which we will take 4 samples from different places of the same silo to make sure that we have repetition. The different factors are related to the density of compaction of 400, 500, 600 and 700kg of organic matter/m3 in association or not with the use of commercial microbial additives. To do the bromatological analysis, we collected sample before closure and at the opening of the silo. The dry matter is determined by the gravimetric method after drying the material in a sterilizer of forced ventilation of 55°C for 72 hours. The dry samples are weighed, crushed (<1mm) and stored in closed plastic recipients to be able to determine the dry matter at 105°C, the composition in crude protein, in fibres in neutral and acid detergent, in ether extract, in ash content and in ammoniacal nitrogen. The losses of dry matter is estimated by the gravimetric method firstly by the difference between (I) the weight of the silos before their closure and at their opening and then thanks to (II) the weight of the bags of sand placed in the silo to capture gas and effluents. The recuperation of dry matter is calculated by the difference between the weight of ensilage before and after being stored in the silo. At the opening of the silo, samples are collected to determine their pH. The data is reviewed to do analysis of variance thanks to the statistic program SAS. Every factor analysed in this experimentation will be tested to prove the homogeneity of the variance of the residue. The regression analysis is realized thanks to the procedure "REG" (density of compaction) and averages compared by the test of Tukey (with and without inoculation). Both of theses test are done to a level of 5% of probability.