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"Experientia docet" - Experience is the best teacher

The heritability of acceptability in South African Merino sheep

  • 2001
  • Issue: 1
  • Volume: 31
G.J. Erasmus, F.W.C. Neser , J.B. van Wyk and J.J. Olivier Page: 13 - 14

Selection for production and reproduction in South African Merino sheep is always combined with selection based on visual appraisal and will, in all probability, remain so for many years to come. Heritabilities for acceptability were estimated using a threshold model…

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An evaluation of Panicum maximum cv. Gatton: 1. The effect of stocking rate and period of absence on the production of sheep

  • 2001
  • Issue: 2
  • Volume: 31
E.A. Relling, W.A. van Niekerk, R.J. Coertze and N.F.G. Rethman Page: 77 - 83

The aim of this study was to evaluate the livestock production potential of Panicum maximum cv. Gatton cultivated under dry-land conditions and grazed at various stocking rates after various periods of re-growth. Treatments included a high stocking rate, fast rotation…

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The effect of flavophospholipol (Flavomycin ®) on milk production and milk urea nitrogen concentrations of grazing dairy cows

  • 2001
  • Issue: 2
  • Volume: 31
B.J. van der Merwe, T.J. Dugmore and K.P. Walsh Page: 101 - 106

Milk production and milk composition responses to supplementation of Holstein-Friesian cows grazing kikuyu pasture in summer and a combination of annual ryegrass and maize silage in winter with 64 mg/d flavophospholipol were determined. There was no difference in the average…

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The effect of selection on genetic parameter estimates

  • 2001
  • Issue: 2
  • Volume: 31
R. van Dyk, F.W.C. Neser and F.H. Kanfer Page: 107 - 114

A simulation study was carried out to investigate the effect of selection on the estimation of genetic parameters for butterfat production in dairy cattle. It was found that selection leads to a substantial overestimation of fixed effects and variance components…

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Intake and rumen degradation in cattle fed napier grass (Pennisetum purpureum) supplemented with various levels of Desmodium int

  • 2001
  • Issue: 3
  • Volume: 31
J.N. Kariuki, S. Tamminga, C.K. Gachuiri, G.K. Gitau and J.M.K. Muia Page: 149 - 157

This study was conducted to assess the effect of greenleaf desmodium (Desmodium intortum) and sweet potato vine (Ipomoea batatus) supplementation of napier grass on dry matter intake, degradation and rumen fermentation in Friesian steers. Four fistulated steers were offered napier…

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