General interest in supplemental Cr for pigs began
when chromium tripicolinate (CrTP) addition resulted
in carcass improvements in finishing pigs (Page et
al., 1993). This was followed by a demonstration of increased
litter size in reproducing sows with CrTP supplementation
(Lindemann et al., 1995). Much research
with many forms of Cr for many species in a variety of
situations has followed (Lindemann, 2007).
A variety of organic forms of Cr is now available
worldwide. As with all minerals, different forms would
be expected to have different bioavailabilities. The relative
bioavailability of the different forms will affect the
ultimate tissue supply of the mineral and, consequently,
will influence both potential biological response(s)
and economics of mineral supply. However, measuring
the relative bioavailability of trace elements can be difficult
because whole-animal responses generally are
not responsive enough to allow clear statistical evaluation
and interpretation, and discriminating methods
of assessment (e.g., using radiolabeled compounds)
that might allow clear statistical differentiation among
sources are very costly. Another method that has been
used with some trace minerals to address this problem
is to evaluate tissue concentrations of a mineral
General interest in supplemental Cr for pigs began
when chromium tripicolinate (CrTP) addition resulted
in carcass improvements in finishing pigs (Page et
al., 1993). This was followed by a demonstration of increased
litter size in reproducing sows with CrTP supplementation
(Lindemann et al., 1995). Much research
with many forms of Cr for many species in a variety of
situations has followed (Lindemann, 2007).
A variety of organic forms of Cr is now available
worldwide. As with all minerals, different forms would
be expected to have different bioavailabilities. The relative
bioavailability of the different forms will affect the
ultimate tissue supply of the mineral and, consequently,
will influence both potential biological response(s)
and economics of mineral supply. However, measuring
the relative bioavailability of trace elements can be difficult
because whole-animal responses generally are
not responsive enough to allow clear statistical evaluation
and interpretation, and discriminating methods
of assessment (e.g., using radiolabeled compounds)
that might allow clear statistical differentiation among
sources are very costly. Another method that has been
used with some trace minerals to address this problem
is to evaluate tissue concentrations of a mineral
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