Effect of chestnut tannin on fermentation quality, proteolysis, and protein rumen degradability of alfalfa silage
Articolo
Data di Pubblicazione:
2006
Citazione:
Effect of chestnut tannin on fermentation quality, proteolysis, and protein rumen degradability of alfalfa silage / E. TABACCO, G. BORREANI, G. M. CROVETTO, G. GALASSI, D. COLOMBO, L. CAVALLARIN. - In: JOURNAL OF DAIRY SCIENCE. - ISSN 0022-0302. - 89:12(2006), pp. 4736-4746. [10.3168/jds.S0022-0302(06)72523-1]
Abstract:
Two experiments were conducted on alfalfa to investigate
the effects of the addition of commercial chestnut
hydrolyzable tannin at ensiling on 1) silage fermentation
quality in lab-scale silos and protein degradation
in the rumen, and 2) silage fermentation quality and
proteolysis in bale silages. Wilted alfalfa was prepared
with 4 tannin levels (0, 2, 4, and 6% on a dry matter
(DM) basis; T0, T1, T2, T3, respectively) and ensiled
in lab-scale silos. Silages (33% DM) were analyzed for
fermentation quality, protein rumen degradability in
situ, and organic matter digestibility in vitro through
gas production after 120 d of conservation. Wilted alfalfa
containing 0 and 4% tannin (T0 and T2) was harvested
at 40%DM(wilting level I) and 53% DM(wilting
level II) for bale (600mmdiameter) silage. Silages were
analyzed for fermentation quality after 78 d of conservation.
All the silages were well fermented with no butyric
acid. Lab-scale silages showed reductions in ammonia,
nonprotein nitrogen (NPN) and DM losses in T2 and T3
treatments, while the fermentation acid profiles were
unaffected. In experiment 1, the untreated silage (T0)
had the highest protein degradability after being incubated
in the rumen. The addition of tannin reduced
crude protein ruminal disappearance in a dose-dependent
manner. However, the tannin reduced the organic
matter digestibility by 5.1% for all of the tannin addition
levels. The tannin positively affected the silage
quality in the round bale silages, in particular reducing
ammonia and NPN in the lowest wilting level. In both
experiments, T2 treatment reduced proteolysis without
any influence of DM on the binding reaction and reduced
the NPN by 15% in comparison to the control.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
E. TABACCO, G. BORREANI, G. M. CROVETTO, G. GALASSI, D. COLOMBO, L. CAVALLARIN
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