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Journal of Dairy Science Vol. 98 No. 9, 2015
UPDATING AND ASSESSING THE CNCPS FEED LIBRARY
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of ADICP are indicative that Maillard reactions have
occurred and are common in many heat-dried feeds
and fermented feeds where excessive heating occurred
(Van Soest and Mason, 1991). Given the importance
of external factors on the composition of different
feeds, the process used in our project was not sensitive
enough to accurately predict the composition of feeds
on a sample-by-sample basis. However, it was capable
of producing estimated compositions under average
conditions in an efficient and repeatable manner that
was useful for reviewing and updating a large database
such as the CNCPS feed library.
Examples of the changes made to selected forages
and concentrates are in Figures 5 and 6. The figures
were constructed so that the 0 point on the y-axis rep-
resents the mean of the data set used to update the
composition (given in brackets on the x-axis) and the
error bars represent ±1 SD from the mean. The new
and old values for each chemical component within the
example feeds are presented relative to the mean and
SD. For forage feeds, typically multiple options were
available for each feed in the feed library. Therefore,
some deviation from the mean could be expected,
as the variation is what makes the individual option
unique (e.g., high NDF, low NDF). In contrast, the
concentrate feeds typically had only one option. In this
case, the composition could be expected to be simi-
lar to the mean (Figure 6). Noteworthy changes that
Figure 2.
Change in model output from a 1 SD increase in the chemical components of feeds used in the reference diet ranked in order of
importance. ADICP = acid detergent-insoluble CP; NDICP = neutral detergent-insoluble CP.