ORIGINAL PAPER
Effects of sucrose, formic acid and lactic acid bacteria inoculant on quality, in vitro rumen digestibility and fermentability of drooping wild ryegrass (Elymus nutans Griseb.) silage
1
South China Agricultural University, College of Forestry and Landscape Architecture
Guangzhou 510642, P.R. China
2
China Agricultural University, College of Animal Science and Technology, Institute of Grassland Science, Beijing100193, P.R. China
3
China Agricultural University, College of Animal Science and Technology, State Key Laboratory of Animal Nutrition, Beijing100193, P.R. China
Publication date: 2017-03-21
Corresponding author
Z. Yu
China Agricultural University, College of Animal Science and Technology, Institute of Grassland Science, Beijing100193, P.R. China
China Agricultural University, College of Animal Science and Technology, Institute of Grassland Science, Beijing100193, P.R. China
J. Anim. Feed Sci. 2017;26(1):26-32
KEYWORDS
ABSTRACT
The aim of the study was to evaluate the effect of sucrose, formic
acid and lactic acid bacteria (LAB) inoculant on chemical composition and
in vitro rumen digestibility of drooping wild ryegrass (Elymus nutans Griseb.)
silage. Fresh drooping wild ryegrass was harvested at boot stage and ensiled
with: 1. control (untreated), 2. 20 g · kg−1 sucrose (S), 3. 3 g · kg−1 formic acid
(FA) and 4. 0.005 g · kg−1 commercial LAB inoculant (LP). The addition of all
three additives increased the Flieg point, and decreased pH and butyric acid
content (P < 0.05). There was lower ammonia N content in silages treated
with S and FA. On the other hand, LP addition elevated lactic acid content
with simultaneous increase of the lactic to acetic acid ratio (P < 0.001). The
silages were further anaerobically incubated at 39 °C for 48 h with buffered
rumen fluid of lactating cows. All three additives increased volatile fatty acid
production (P = 0.008). Addition of LP increased average gas production rate
and ammonia N content (P < 0.001). In brief, well fermented drooping wild
ryegrass silages were obtained by adding LP or S in comparison to FA. LP can
be recommended as a silage additive for preparing well fermented silage, and
FA could be applied as a regulator additive to control the level of lactic acid
produced during drooping wild ryegrass ensiling.
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