Resumen:
The objective of this study was to evaluate
the effects of Saccharomyces cerevisiae on in
vitro gas production (GP) kinetics and degradability
of corn stover, oat straw, sugarcane
bagasse and sorghum straw. Feedstuffs were
incubated with different doses of yeast [0, 4, 8
and 12 mg/g dry matter (DM)] at direct addition
or 72 h pre-incubation. Rumen GP was
recorded at 2, 4, 6, 8, 10, 12, 14, 24, 30, 48, 54
and 72 h of incubation. After 72 h, rumen pH
and methane were determined and contents
were filtrated for DM, neutral (NDF) and acid
detergent fibre (ADF) degradability. Fibrous
species×method of application×yeast interactions
occurred (P<0.001) for all measured
ruminal GP parameters and degradability. The
direct addition or 72 h pre-incubation of S.
cerevisiae with corn stover improved (P<0.05)
GP and methane and decreased (P<0.05) the
lag time (L) and NDF degradability (NDFD).
The direct addition of S. cerevisiae to oat straw
increased (P<0.05) rate of GP (c) and
decreased (P<0.05) asymptotic GP (b).
However, 72 h pre-incubation increased
(P<0.05) c with linearly decreased b, DM
degradability (DMD) and NDFD. Applying S.
Descripción:
The aim of this study was to determine
effects of increasing doses of the yeast
(Saccharomyces cerevisiae) in two methods of
applications (direct or 72 h of pre-incubation)
on in vitro GP, degradability and some ruminal
fermentation parameters of the fibrous feedstuffs
of corn stover, oat straw, sugarcane
bagasse, and sorghum straw.
