Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1999.1629.1631In vitro Quality Assurance of Vitamin A and D in Poultry Feeds]]>RashidM. NawazR. B. Ahmed 4199924The results revealed that 42 and 40 percent feed samples contained labelled amount of vitamin A and D respectively, while 34 and 26 percent samples contained lesser amount and 26 and 32 percent samples contained excess amount of vitamin A and D in the poultry feeds.]]>Edwards, Jr. H.M.,199012010541061Edwards, H.M., M.A. Elliot, S. Sooncharernying and W.M. Britton,199473288294Elliot, M.A. and H.M. Edwards,199473509519Friedman, A., A. Meidovsky, G. Leitner and D. Sklan,1991Escherichia coli infection in chicks with low or high intakes of vitamin A.]]>121395400Frost, T.J., D.A. Roland and G.G. Untawale,19906920082016Hart, L.E., H.K. Schnoes and H.F. DeLuca,1986250426434Hodata, K. and T. Hawada,198543181186Kannan, Y., H. Harayama and K.A.T.O. Seishiro,199835108116Konno, T., T. Asada and T. Katsuki,198433162170Lessard, M., D. Hutchings and N.A. Cave,19977613681378Raza, A., S.A. Khan, F.K. Raza, M.A. Saeed and I.N. Bashir,1997128188Rowland, G.N., M.W. Britton, H.P. Long, R.S. Lee and M.F. Mohamed,19981998pp: 112114Narbaitz, R., C.P.W. Tsang, A.A. Grunder and J.H. Soares,198766341347Saleh, G., W. Eleraky and J.M. Gropp,1995Tilapia nilotica (Oreochromis niloticus).]]>11382385Saxena, Y. and S.S. Chandna,1996308186Schleicher, A., S. Kinal, Z. Fritz and D. Jamroz,1994333745Shinki, T., H. Tanaka, T. Kadofuku, T. Sato and T. Suda,19899614941501Sijtsma, S.R., C.E. West, J.H.W.M. Rombout and A.J. Van der Zijpp,1989119940947Sklan, D., D. Melamed and A. Friedman,199536385392Stevens, V.I. and R. Blair,198735755764