Abstract
ABSTRACT A completely randomised design was adopted with five treatments urea levels of 0, 2, 4, 6, and 8% of dry matter and five replicates per treatment. The fermentation products were analysed using an in vitro semiautomatic gas production technique. Ammoniation had a significant linear effect on DM, NDF, hemicellulose, acid detergent fiber, and neutral detergent insoluble nitrogen. Ammoniation had a positive linear effect on crude protein (CP) content; increasing urea by 1% caused an increase in CP by 5.19 g kg−1 DM. The gas production based on DM, OM, and NDF decreased linearly with increasing urea for every 1% urea added to the hay, there was a reduction in gas production of 1.40, 3.27, and 4.21 ml/g DM, OM, and NDF, respectively. The concentration of methane decreased linearly with urea dose; for each 1% reduction in urea, there was a 0.15, 0.34, and 0.41 ml/g reduction in methane concentration during the degradation of DM, OM, and NDF, respectively. Ammoniation with 8% urea improved the chemical composition of cassava stem hay and decreased methane production.
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