Pullets fed on diets containing 30% Leucaena leaf-meal had immature ovaries at
22 weeks of age. After administering mammalian follicle stimuating hormone (FSH) to
half of this group of hens they were found to have fully developed ova after 3 weeks,
whereas the untreated pullets showed virtually no ovarian development (Scott et al
1969). It was concluded that a factor in Leucaena leaves possibly mimosine, has an
inhibitory action upon production and/or release of F.S.H. by the anterior pituitary of
the hen.