Feed Management - November/December 2017 - 29
FeedManagement ❙ 29
WHILE BLOOD TESTS ARE probably the most
common method used to assess mineral status in
ruminants, they may not be the most appropriate.
Depletion generally occurs in the order of storage
- transport followed by functional - thus resulting in clinical deficiencies.
Blood is a transport pool for many minerals, and
low values here may not be an accurate predictor or
reflection of a clinical issue, serum copper being one
example. Whole blood versus serum selenium can
also be used as an example. The latter is a measure
of the transport pool and is correlated with dietary
intake while the former can represent transport and
functional pool and is less sensitive to changes in dietary intake.
Additionally, turnover of red blood cells (RBC)
means response to supplementation is generally
slower in whole blood compared with that in serum,
and this should be considered in the timing of sampling.
A further limitation is the homeostatic control
of some mineral elements resulting in little change
in blood values. The magnitude of effect of different influencing factors on blood mineral levels varies
with mineral. For example, selenium level is greatly
affected by diet but less so by animal factors while the
reverse is true for copper.
Creatine as a Conditionally
Learn how direct supplementation of GAA can
help achieve optimal levels of creatine and
improve feed efficiency, growth rate and breast
meat yield in broilers.
Read Now: https://goo.gl/3PUVPZ
November/December 2017 ❙ www.WATTAgNet.com