Egg Industry - January 2018 - 24
24 ❙ EggIndustry
LOW-PROTEIN ANIMAL DIET
WE MUST ALWAYS REFER to the
non-supplemented basic diet and
not the one we use now.
imbalances will also occur as protein-rich
ingredients are not just protein; they also
contribute several minerals, such as potassium. In general, let the best experts
handle this. It is not impossible, but it is
an invitation to disaster without consulting
a most qualified nutritionist.
So, next time you read in one of my articles or elsewhere that a low-protein diet is required in order for any
antibiotic nutrition program to work, you will have an
idea how this relates to your own feeds. It is always the
diet without feed-grade amino acids that should be taken
as the starting point and not the current diet being used.
As most diets today contain at least some feed-grade lysine or methionine, when advice is made to reduce crude
protein by X percentage units, we must always refer to
the non-supplemented basic diet and not the one we use
now. Doing otherwise runs the risk of facing the prob-
lems mentioned in steps four and five above.
As a side note, one should do this exercise described
here by dropping crude protein by only 1 percentage unit
at a time: say, from 21 to 20 to 19 to 18 to 17. Such process
will result in feed-grade amino acids being pulled in one
at a time (the most limiting each time) revealing the order of limitation. Then, we could work with another feed
ingredient (say, rapeseed meal or barley) and see how the
order of limiting amino acids changes (or not). Repeat
with another species and observe a totally different, yet
similar pattern in getting amino acids in a limiting order.
Isn't nutrition interesting? ■