02186naa a2200253 a 450000100080000000500110000800800410001902400410006010000230010124501020012426000090022652014140023565000350164965000200168465000130170465000140171765000200173165300270175170000130177870000220179170000160181370000290182977300740185817836692010-05-13       2009    bl uuuu     u00u1 u    #d7 a10.1590/S1516-359820090010000032DOI1 aMARTUSCELLO, J. A.  aAmong and within family selection and combined half-sib family selection in Panicum maximum Jacq.  c2009  aThe objective of this study was to select superior genotypes in half-sib populations obtained from crosses between sexual plants and apomictic accessions. The experiment also proposed to compare among and within family and combined selection strategies. Ten plots of sexual plants were randomly distributed among 230 plots of apomictic accessions. After natural pollination, seeds of each sexual plant constituted a half-sib family. Thirty plants of each female progenitor were evaluated in a randomized block design experiment, with five plants per plot and five replications. Five evaluation harvests were made in the rainy seasons and two in the dry seasons of all plants. The production and quality characteristics were evaluated. The selection criteria used was: among and within family selection and combined selection with 50% selection in both. The selection criteria used (among and within family selection and combined selection), were efficient for use in P. maximum breeding, with medium to high gains for most characteristics evaluated. The highest genetic gains were obtained from combined selection. However, among and within family selection promoted high genetic gains and may be used in P. maximum breeding. The sexual progenitors identified as numbers 7, 1, 3 and 5 were promising and may be used in future crosses, as well as to increase the genetic variability in the P.maximum  genebank.  aMelhoramento Genético Vegetal  aPanicum Maximum  aPastagem  aSeleção  aValor Nutritivo  aProdução de forragem1 aJANK, L.1 aFONSECA, D. M. da1 aCRUZ, C. D.1 aCUNHA, D. de N. F. V. da  tRevista Brasileira de Zootecniagv.38, n.10, p. 1870-1877, out. 2009.