Limited reports are available on the bioefficacy of organic
Mn compared with inorganic Mn for laying hens,
and certain published results are inconsistent. Bunesova
(1999) and Klecker et al. (2002) reported that organic
Mn sources improve laying performance and eggshell
thickness, whereas other studies indicate no difference
between organic and inorganic Mn sources (Lim and
Paik, 2003; Mabe et al., 2003). The statistical approach
and experimental design used to evaluate the bioefficacy
of Mn may be the main factors underlying the
inconsistency.
Based on data structure of the respective doseresponse