DiConstanzo,A.,J.C.Meiske,S.D.Plegge,T.M.Peters.and.R.D. Goodrich.1990. Within - herd variation in energy untilization for maintenance and gain in beeef cows. J. Anim Sci.68:2156
Ferrell,C.L.and.T.G.Fenkins.1985.Cow.type.and.the.nutritional. environment. J.Anim.Sci.61:725
Fluharty,F.L.,T.B.Turner,S.J.Moeller and G.D.Lowe.1996.Effects of age at weaning and diet on growth of calves.Ohio State Univ.Research and Reviews.OARDCCirc.No.156
Gardner,B.A.,S.L.Northcutt,H.G.Dolezal,D.R.Gill,F.K.Ray.J.B.Morgan and C.W.Swearhart.1996.Factors influencing profitability of feedlot steers. Oklahoma State Univ.Animal Scoence Research Rep.p.951
Gregpry,K.E.,G.L.Bennett,L,D.VaVleck,S.E.Echternkamp and L.V.Cundiff.1997.Genetic and environmental parameters for ovulation rate,twinning rate.and weight traits in a cattle population selected for twinning.J.Anim.Sci.75:1213
Guerra-Martinez,P.,G.E.Dickerson,G.B.Anderson,and R.D.Green.1990.Embry-transfer,twinning and performance in beef production.J.Anim.Sci.68:4039
Hotovy,S.K.,K.A.Johnson,D.E.Johnson,G.E.Carstens,R.M.Bourdon and G.E.Seidel,Jr.1991.Variations among twin beef cattle in maintenance energy requirments.J.Anim.Sci.69:640
Jenkins,D.E.1984.Maintenance requirements for beef cattle:Importance and physiological causes of variation.in :Proc.Beef Cow Efficiency Forum.p.6.Michigan State Univ.,East Lansing,MI,and Colorado State Univ.,Fort Collins,Colo.
Koots,K.R.and J.P.Gibson.1998b.Effects of production and marketing circumstances on economic values for beef production traits.Can.J.Anim.Sci.78:47
Kress,D.D.,D.E.Doornbos and D.C.Anderson.1990.Performance of crosses among Hereford,Angus and Simmental cattle with different levels of Simmental breeding.V.Calf production,milk production and reproduction of three-to eight-year-old dams.J.Anim.Sco.68:1910
Lambert,C.1991.Lost opportunitier in beef production.Proc.International Stockmen"s School,Feb.14,199,Houston,texas
Lardy,G.,D.Adams,D.Clark,T.Klopfenstein,J.Johnson and A.Applegate.1998.Spring versus summer calving for the nebraska Sandhills:Production characteristics.Univ.of Nebraska Beef Cattle Rep.MP69-A
Lusk,J.,Fox,T.Schroeder,J.Mintert and M.Koohmaraie.1999.Will consumers pay for tender
Steak? Research Bull.3-99,Research Inst.on Livestock,Priceing, Agricutural and Applied Economics,Virginia Tech,Blacksburg
Maynard,G.1998.Net feed efficicy in beefcattle.BeefImprovement Federation Research Symp.And Annual Meeting,June 30-July 2,1999,Calgary,Alb.
Mcneill,J.W.1999/Texas A&M Ranch to Railnorth/south 1998-99 Summary Report.Texas A&M Univ.,College Station
Meyers,S.E.,D.B.Faulkner,F.A.Ireland and D.F.Parrett.1999.Comparison of three weaning ages on cow-calf performance and steer carcass traits.J.Anim.Sci.77:323
