There is no perfect method to measure absorption and digestion of microminerals due to the complexity of endogenous micromineral excretion in animals. In the present experiment, the BMM diets contained Zn and Cu, which were close to or less than the requirement for growing pigs (NRC, 2012). Therefore, the negative retention:absorption of Zn and Cu observed in the corn grits diet without supplementation of Zn indicates that the BMM diet was Zn and Cu deficient and endogenous
Zn and Cu may have been secreted into the intestinal tract via pancreatic juice, bile, or the transepithelial flux
from mucosal cells (Hambridge et al., 1986).
There is no perfect method to measure absorption and digestion of microminerals due to the complexity of endogenous micromineral excretion in animals. In the present experiment, the BMM diets contained Zn and Cu, which were close to or less than the requirement for growing pigs (NRC, 2012). Therefore, the negative retention:absorption of Zn and Cu observed in the corn grits diet without supplementation of Zn indicates that the BMM diet was Zn and Cu deficient and endogenousZn and Cu may have been secreted into the intestinal tract via pancreatic juice, bile, or the transepithelial fluxfrom mucosal cells (Hambridge et al., 1986).
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