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Effect of urea on gas and effluent losses, microbial populations, aerobic stability and chemical compositivo of corn (Zea mays L.) silage
Author(s) -
Ana Paula Maia dos Santos,
Edson Mauro Santos,
Juliana Silva de Oliveira,
Gleidson Giordano Pinto de Carvalho,
Gherman Garcia Leal de Araújo,
A. M. Zanine,
Ricardo Martins Araújo Pinho,
Daniele de Jesus Ferreira,
Alberto Jefferson da Silva Macêdo,
Joyce Pereira Alves
Publication year - 2021
Publication title -
revista de la facultad de ciencias agrarias. universidad nacional de cuyo
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.283
H-Index - 10
eISSN - 1853-8665
pISSN - 0370-4661
DOI - 10.48162/rev.39.030
Subject(s) - silage , urea , chemistry , dry matter , fermentation , effluent , zoology , ammonia , agronomy , food science , biochemistry , biology , waste management , engineering
We evaluated the effects of urea addition on gas and effluent losses, fermentation profile, microbial populations, aerobic stability and chemical composition of corn silages. A completely randomised design with five levels of urea (0, 0.5, 1.0, 1.5, and 2.0% based on dry matter) and five replicates was used. A decreasing linear effect of urea levels on effluent losses in corn silages was observed. In parallel, an increasing linear effect of urea levels on pH, increasing from 3.49 to 4.12 in silages without urea in relation to silages with the maximum urea level, was also observed. Urea addition improved the aerobic stability of the silages, with 62 h for the silages without urea and from 90 to >96 h for the silages with urea. Based on the results of the principal components, two groups (I and II) could be distinguished. The most discriminating variables in group I were dry matter (-0.9), pH (-1.2) and lactic acid bacteria (-0.9), while in group II, effluent losses (1.0), ethanol (1.0), acetic acid (0.8) and gas losses (0.8) were most important. The use of urea at inclusion levels of around 2% in corn silage reduced gas losses, improved the nutritive value and promote the aerobic stability of silages. Highlights: The addition of urea in the corn silages increased the pH values from 3.49 (control) to 4.12 (2% of urea DM). The use of urea improved chemical composition of corn silages. The addition of urea reduced the moulds and yeast populations in the corn silages after exposure to air. Urea addition improved the aerobic stability of the corn silages.

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