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"Experientia docet" - Experience is the best teacher

Voluntary intake and quality of diet selected by cattle grazing bana grass, kikuyu and forage sorghum

  • 1992
  • Issue: 1
  • Volume: 22
H.H. Köster, H.H. Meissner, R.J. Coertze and N.F.G. Rethman Page: 35 - 41

Bana grass (Pennisetum purpureum x P. amerieanum) was compared with kikuyu (P. clandestinum) and forage   sorghum (Sorghum bicolor) with respect to quality of samples ;elected by four oesophageally fistulated steers. Hand-cut samples of the three forages were also compared…

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Studies on the chemical composition and digestible energy content of South African grain sorghum

  • 1992
  • Issue: 2
  • Volume: 22
T.S. Brand, H.A. Badenhorst, E.H. Kemm, F.K. Siebrits and J.P. Hayes Page: 43 - 49

The experiment was conducted (i) to compare the chemical and physical composition of grain sorghum produced at different locations, (ii) to compare the digestible energy (DE) content of different grain sorghum cultivars produced at different locations, and (iii) to evaluate…

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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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Quantitative aspects of semen imports for South African dairy breeds

  • 1992
  • Issue: 3
  • Volume: 22
H.E. Theron, J.H. Hofmeyr and S.J. Schoeman Page: 87 - 91

Dairy cattle semen imported from January 1979 to June 1989 consisted of 72% Holstein-Friesian, 13.6% Jersey, 11.5% Ayrshire and 2.8% Guernsey semen. There has been a significant increase in the importation of Holstein-Friesian semen and, to a lesser extent, in…

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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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