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1 Journal of Animal and Feed Sciences

1 2018

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Effect of urea and molasses supplementation on quality of cassava top silage

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Kang S. , Wanapat M. , Nunoi A.

Journal of Animal and Feed Sciences

2018

tom 27

nr 1

The aim of the study was to evaluate the nutritive value and fermentation efficiency of cassava top silage using in vitro gas production technique. The four-month plants were harvested, chopped into 2–3 cm pieces and ensiled with 0, 0.5 and 1% urea (U), and 0, 0.5, 1 and 2% molasses (M) (on the basis of the crop dry matter (DM)). Silage pH increased with U supplementation but decreased by addition of 2% of M, so the lowest pH values were observed in: U0M0–2 and then in U0.5M2 and U1M2 groups. The U supplementation increased crude protein content in cassava top silage in a dose-dependent manner. There was observed U × M interaction for neutral and acid detergent fibre contents (NDF and ADF, respectively) – when added together the M decreased these parameters in a dose-dependent manner, and the lowest value of NDF was observed in U1M2 group, and of ADF – for U0M2, U0.5M2 and U1M2 groups. The cumulative gas production was increased when either U or M were added, and the highest value was observed in U0.5M2 and U1M2 groups. In addition, the true digestibility was increased when M was added and the NDF digestibility was the highest in M2 groups. Fermented pH was increased by U supplementation while protozoa populations were similar among treatments. So, supplementation with 0.5–1% of U and 2% of M may increase cassava top silage quality and the in vitro fermentation efficiency. However studies evaluating cassava top silage influence on animal growth performance are recommended.