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"Experientia docet" - Experience is the best teacher

Genetic trends in a South African Mutton Merino nucleus breeding scheme

  • 1999
  • Issue: 1
  • Volume: 29
H.Q. Gray, F.W.C. Neser, G.J. Erasmus and J.B. van Wyk Page: 48 - 53

Genetic parameters and trends were estimated for 2296 lambs from a SA Mutton Merino nucleus breeding scheme using multiple trait mixed model procedures. Direct heritability estimates obtained for the traits were 0.32 for weaning weight, 0.03 for post-weaning average daily…

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Multitrait estimation of direct and maternal (co)variances for growth and efficiency traits in a multibreed beef cattle herd

  • 1999
  • Issue: 3
  • Volume: 29
S.J. Schoeman and G.F. Jordaan Page: 124 - 136

Estimates of (co)variance components were obtained for growth and efficiency traits in a multibreed synthetic beef cattle herd. Components were estimated simultaneously by fitting four alternative seven-trait models. Direct heritabilities varied according to the model fitted but were higher for…

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Supplementation of selenium to sheep grazing kikuyu or ryegrass: I. Selenium status of unsupplemented sheep and animal performa

  • 1999
  • Issue: 3
  • Volume: 29
J.B.J. van Ryssen, R.J. Coertze and J.F. de Villiers Page: 137 - 144

The selenium (Se) status of lambs grazing kikuyu (Pennisetum clandestinum) or ryegrass (Lolium multiflorum) in the KwaZulu-Natal Midlands was determined during four trials and their growth response to Se supplementation was measured. Two methods of Se supplementation were evaluated using…

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Supplementation of selenium to sheep grazing kikuyu or ryegrass: II.Effect on selenium concentration in the grass and body tissu

  • 1999
  • Issue: 3
  • Volume: 29
J.B.J. van Ryssen, R.J. Coertze & J.F. de Villiers Page: 145 - 153

The investigation entailed four trials in which selenium (Se) was supplemented to lambs grazing kikuyu (Pennisetum clandestinum) pastures during two summer periods or Italian ryegrass (Lolium multiflorum) pastures during two winter periods. Two methods of supplementing the lambs were tested,…

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