The effect of silage additives containing formaldehyde on the fermentation of ryegrass ensiled at different dry matter levels and on the nutritive value of direct-cut silage |
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Authors: | AR Henderson P McDonald DH Anderson |
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Institution: | Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG Gt. Britain |
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Abstract: | Ryegrass, harvested at the pre-ear emergence stage of growth, was ensiled in laboratory silos, either fresh (175 g dry matter kg?1) or wilted to five DM levels ranging from 216–432 g DM kg?1, with and without additive treatment. The additives used were “Sylade” containing sulphuric acid (15%) and formaldehyde (23%) applied at 4.6 l t?1 and an “ADD-F” mixture (7:3 by volume) applied at a similar rate (4.8 l t?1). An additional treatment included application of the mixture at a constant rate related to the DM content of the ensiled crop (25 l t?1 DM).In the untreated silages, the water-soluble carbohydrates (WSC) varied, respectively (over the DM range 175–432), from 0–32 g kg?1 DM compared with 197-6 g kg?1 DM for the “Sylade” treated silages and 256-50 g kg?1 DM for the formic acid/formalin silages treated at an additive rate of 4.8 l t?1. Corresponding ranges of protein N for the control and treatments (expressed as g kg?1 total N) were 302–447, 624-502 and 620-505, respectively. When the formic acid/formalin additive was applied at a constant level related to the DM content of the crop, although the WSC content decreased with increasing DM (247-158 g kg?1 DM), the protein N content (612 g kg?1 total N) remained constant.Grass from the same field was ensiled fresh, treated with “ADD-F” at the rate of 3.4 l t?1 fresh grass, at the rate of 4.8 l t?1 fresh grass and “Sylade” at the rate of 4.6 l t?1 fresh grass. The silages were given to Suffolk-cross wether lambs in digestibility and intake trials. Digestibility coefficients of DM and energy of the silage treated with “Sylade” were significantly lower (P < 0.05) than those of the other three silages. The DM intakes of all the silages were high, ranging from 27.7 g kg?1 live weight for the “Sylade” silage to 30.7 g kg?1 live weight for the silage treated with . Live weight gains ranged from 200 g/day for the control silage to 267 g/day for the silage. |
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