Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2009.1448.1454YazdiM. HosseinAmanlouH. MahjoubiE. 1220091222The aim of this study was to compare the effects of two levels of Crude Protein (CP) using Poultry by-Product Meal (PBPM) fed during late gestation on the performance, blood metabolites and colostrum composition of Holstein cows. Twenty multiparous cows 26±6 days before expected calving were assigned randomly to two treatments containing 1) 140 g kg-1 DM CP (34 g kg-1 DM PBPM) 2) 160 g kg-1 DM CP (75 g kg-1 DM PBPM). The cows BCS was 3.56±0.5 on average, at the beginning of the trial. Yields of milk, protein, lactose and fat were not affected by prepartum dietary CP level. Colostrum composition (fat, CP and total solids percents), blood metabolites (Ca, glucose, total protein, albumin, globulin, urea N and cholesterol) and metabolic diseases incidence were not influenced by prepartum dietary CP level. There was no significant difference between treatments in body weight and BCS changes. As expected, blood urea N before calving was higher in the cows fed 160 g kg-1 DM CP diets (p<0.002). Serum cholesterol during prepartum (p<0.03) and postpartum (p<0.01) periods was significantly lower in 160 g kg-1 DM CP treatment. In general, although postpartum glucose level increased in cows which received 160 g kg-1 DM CP in the diet, it seems that there is no other obvious advantages over feeding the 140 g kg-1 DM CP diet. So feeding this level of CP diet to close up cows is recommended.]]>AOAC., 199015th Edn.,Butler, S.T., J.J. Murphy, G.K. Stakelum, F.P.O. Mara and M. Rath,2002417185Chew, B.P., F.R. Murdock, R.E. Riley and J.K. Hillers,198467270275Danfær, A., V. Tetens and N. Agergaard,1995111201210Dann, H.M., G.A. Varga and D.E. Putnam,19998217651778Friggens, N.C., P. Berg, P. Theilgaard, I.R. Korsgaard, K.L. Ingvartsen, P. Løvendahl and J. Jensen,20079052915305Goff, J.P. and R.L. Horst,199780176186Greenfield, R., M.J. Cecava, T.R. Johnson and S.S. Donkin,200083703710Johnson, D.G. and D.E. Otterby,198164290295Griinari, J.M. and D.E. Bauman,20062006pp: 389-419pp: 389-419Grummer, R.R., P.C. Hoffman, M.L. Luck and S.J. Bertics,199578172180Gustafsson, A.H. and D.L. Palmquist,199376475484Hartwell, J.R., M.J. Cecava and S.S. Donkin,20008329072917Hayirli, A., R.R. Grummer, E. Nordheim, P. Crump and D.K. Beede et al.,199982113113Hook, T.E., K.G. Odde, A.A. Aguilar and J.D. Olson,198967539539Huyler, M.T., R.L. Kincaid and D.F. Dostai,199982527536Jordan, E.R., T.E. Chapman, D.W. Holtan and L.V. Swanson,19836618541862McNeill, D.M., R. Slepetis, R.A. Ehrhardt, D.M. Smith and A.W. Bell,199775809816Murphy, J.J,199957169179Mustafa, A.F., S.Y. Qiao, P.A. Thacker, J.J. McKinnon and D.A. Christensen, 20008016481654NRC,20017th Edn.,Pages: 405Pages: 405National Research Council (NRC),19896th Rev. Edn.,Oltner, R., M. Emanuelson and H. Wiktorsson,1985124757Park, A.F., J.E. Shirley, E.C. Titgemeyr, M.J. Meyer, M.J. Van-Baale and M.J. Vande-Haart,20028518151828Putnam, D.E., G.A. Varga and H.M. Dann,199982982995Putnam, D.E. and G.A. Varga,19988116081618Robinson, P.H., J.M. Moorby, M. Arana and T. Grahm,20041144257Ryan, G., J.J. Murphy, S. Crosse and M. Rath,2003796171Santos, J.E.P., P. Depeters and E.J. Jardon,200184213224SAS Institute,2003Version 9.1 Edn.,Van Saun, R.J., S.C. Idleman and C.J. Sniffen,199376236244Wildman, E.E., G.M. Jones, P.E. Wagner, R.L. Boman, H.F. Troutt Jr. and T.N. Lesch,198265495501