AL-Fuhri, M.A. and AL-Zuhairi, Z.A. (2010) “Effect the powderd Nigella sativa L. seeds supplementation in hens layer diet on egg characteristics and some biochemical blood parameters”, Kufa Journal for Veterinary Medical Sciences, 1(2), pp. 1–9. doi:10.36326/kjvs/2010/v1i24052.