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"Experientia docet" - Experience is the best teacher

Environmental and genetic trends in clean fleece mass, live mass and fibre diameter in selection and control flocks involving a

  • 1992
  • Issue: 2
  • Volume: 22
S.W.P. Cloete, G.J. Delport, G.J. Erasmus, J.J. Olivier, H.J. Heydenrych and E. du Toit Page: 50 - 57

This study was undertaken to investigate the genetic stability of an unselected Control Group of South African Merino sheep and genetic change in a flock selected for increased clean fleece mass (Selection Group) under the same environmental conditions. Data regarding…

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Application of Householder`s transformations and the QL algorithm to REML estimation of variance components

  • 1992
  • Issue: 3
  • Volume: 22
K.V. Konstantinov and G.J. Erasmus Page: 92 - 96

Restricted maximum likelihood (REML) is widely regarded as the preferred procedure for estimating variance components in animal breeding problems. The size of the coefficient matrix, however, often leads to computational difficulties and many simplified algorithms, including diagonalization, have been proposed.…

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