The lack of improvement in piglet performance as a
result of phytase and OA supplementation, despite
some improvement in digestibilities of phytate P and
other nutrients, has been reported in several studies
(Thacker et al., 1992; Inborr et al., 1993; Radcliffe et
al., 1998). In general, the effectiveness of phytase and
OA in diets for young pigs has been poor and quite
variable. This could be attributed to various factors,