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so is net energy superior to de ome for
predicting the performance or in other
words the performance of the animals
such as body weight gain better related
to net energy intake done to de or to
any intake again if we come back to this
table showing that the hierarchy between
fields differs between the de mes energy
system we have to keep in mind that
protein sources are overestimated in the
de and M assistance while fat sources
are underestimated in the DME systems so
is the response of the pig
very similar to what should be observed
or concluding for the feed energy value
for doing that we have taken a trial
where two diets were fed to growing pigs
two diet normal protein diet and a low
protein diet supplemented with synthetic
amino acids and you can see that the
amount of energy per day for a given
level of performance was absolutely
identical for the two types of diets
bird for de and ami systems the energy
required for the same level of
performance was higher with the
high-protein diet than with the low
protein diet meaning that the high
protein diet who was overestimated
because of that higher proportion of
protein similarly when you look at the
performance of growing pigs according to
the season and in all pigs fed diets
with different fat contents you can see
that if you express the values relative
to the diet that contain no fat Superman
it the amount of energy per kilo of gain
is absolutely constant and independent
on the fat inclusion level while for de
and
me the amount of energy per kilo of gain
decreased significantly when you have
more fat in the feet meaning that again
fat level or the fat energy value is
underestimated in the de or mi system so
both tried indicate that the de and ami
systems are unable to predict the
response or are not good predictors of
the performance of the animals when you
have diet changes either protein levels
of fat levels so the first conclusion is
that the net energy content is probably
the best system to predict the
performance and the production cost in
pigs and also in poultry production we
may have to come back to measurement of
net energy in some specific situation
indeed the measurement of heat increment
and of net energy may be required in
this situation and one example is the
enzymes where the fasting reproduction
or the cave value may be affected that's
a study which was conducted in the feed
industry where to diet or three diets
were fed with and without and with
enzymes as observed in many studies the
metabolize ability of the diet was
improved by enzymes but that was on the
Italian si
similarly the any over ami ratio was
higher with the enzymes addition so that
means that the ami value of the diet was
increased but not significantly on your
tenancy by 1.3 percent in that study but
the combined effect of increased
metabolism eet and increased efficiency
of ami for net energy
resulted in a significant increase in
the net energy value of the feed due to
the supplementation with enzymes so at
the end we can conclude that clearly net
energy prediction equation available
they are free they can be used very
safely for both swine and also for
poultry I would stress then there is no
need to measure ingredients net energy
as done many times in the recent years
and also some factors a variation of de
or ami should be much more taken into
account in the future since the de and
the ami are the predictors used for
calculating the net energy we have seen
that net energy is a better predictor of
performance than de or AMI and what is
clear also is that net energy is a more
robust criteria for evaluating energy
for your feed when you have important
diet changes
you
