Implications
Our main conclusion regarding enzyme feed additives
is that a direct ruminal effect of the enzymes is improbable
at the suggested application rates with these diets:
gas responses were too low, and the enzyme activities
added were insignificant in comparison with the enzymes
already present in the feedstuffs or ruminal microorganisms.
This does not eliminate adaptive, or preor
postruminal effects. More experiments need to be
carried out to focus on these aspects, particularly prefeeding
storage times and conditions. Finally, the results
demonstrate that microbial enzyme activity limits
the rate of fiber digestion by ruminal microorganisms.
The plant fiber itself does not limit the fermentation
rate, at least when presented in the small particulate
form used here, and direct stimulation of cellulolytic
ruminal microbes and their enzyme activities would be expected to benefit the nutrition of ruminants receiving
corn or grass silage-containing diets.
Implications
Our main conclusion regarding enzyme feed additives
is that a direct ruminal effect of the enzymes is improbable
at the suggested application rates with these diets:
gas responses were too low, and the enzyme activities
added were insignificant in comparison with the enzymes
already present in the feedstuffs or ruminal microorganisms.
This does not eliminate adaptive, or preor
postruminal effects. More experiments need to be
carried out to focus on these aspects, particularly prefeeding
storage times and conditions. Finally, the results
demonstrate that microbial enzyme activity limits
the rate of fiber digestion by ruminal microorganisms.
The plant fiber itself does not limit the fermentation
rate, at least when presented in the small particulate
form used here, and direct stimulation of cellulolytic
ruminal microbes and their enzyme activities would be expected to benefit the nutrition of ruminants receiving
corn or grass silage-containing diets.
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