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"Experientia docet" - Experience is the best teacher

A comparison of the yield, nutritional value and predicted production potential of different maize hybrids for silage production

  • 2000
  • Issue: 1
  • Volume: 30
R. Meeske, H.M. Basson, J.P. Pienaar and C.W. Cruywagen Page: 18 - 21

The yield, nutritional value and production potential of silage made from twenty one maize hybrids were compared. The digestibility of organic matter and predicted intake, mean retention time and milk production potential were found to differ between hybrids (p <…

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Evaluation of in vivo techniques for the determination of apparent ileal amino acid digestibilities in feedstuffs for piglets

  • 2000
  • Issue: 1
  • Volume: 30
J. Viljoen, S.E. Coetzee, J.C. Fick, F.K. Siebrits and J.P. Hayes Page: 7 - 15

Three in vivo techniques were evaluated in terms of their suitability for determination of the apparent ileal amino acid digestibility (AID) of protein sources for piglets. The techniques were: ileo-rectal anastomosis (IRA), cannulation at the distal ileum and a slaughter…

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Phosphorus supplementation to natural pasture grazing for beef cows in the Western Highveld region of South Africa

  • 2000
  • Issue: 1
  • Volume: 30
C.H.M. de Brouwer, J.W. Cilliers, L.M. Vermaak, H.J. van der Merwe and P.C.N. Groenewald Page: 43 - 52

Simmentaler cows grazing Cymbopogon-Themeda veld in the western Highveld region of South Africa (1985/861989/90) received three levels of phosphorus (P) supplementation. Dicalcium phosphate content of the supplement was manipulated to give intakes of 8 (CS), 4 (HS) or 0 (ZS)…

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The influence of proportion of Simmentaler breeding in a multibreed synthetic beef cattle population on preweaning growth traits

  • 2000
  • Issue: 2
  • Volume: 30
S.J. Schoeman, G.F. Jordaan and H. Skrypzeck Page: 98 - 109

Data from a multibreed composite beef cattle population managed under intensive irrigated grazing conditions were used to estimate direct additive heritabilities (h2a) and maternal heritabilities (h2m) for birth weight (BW) and weaning weight (WW) of the calf and cow efficiency…

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Pre-weaning growth traits of the Hereford breed in a multibreed composite beef cattle population

  • 2000
  • Issue: 3
  • Volume: 30
H. Skrypzeck, S.J. Schoeman, G.F. Jordaan and F.W.C. Neser Page: 220 - 229

Data from a multibreed composite beef cattle population, managed under intensive irrigated grazing conditions, were used to estimate direct additive heritabilities (h2a), maternal heritabilities (h2m) and maternal permanent environmental effects (c2) birth weight (BW) and weaning weight (WW) of the…

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Genetic characterization of native southern African chicken populations: evaluation and selection of polymorphic microsatellite

  • 2000
  • Issue: 1
  • Volume: 30
E. van Marle-Köster and L.H. Nel Page: 1 - 6

This study presents the first results on the evaluation and selection of polymorphic microsatellite markers for the genetic characterization of native chicken populations in southern Africa. Blood samples for DNA extraction were obtained from five chicken lines from South Africa…

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Genetic studies on the South African Mutton Merino: growth traits

  • 2000
  • Issue: 3
  • Volume: 30
F.W.C. Neser, G.J. Erasmus and J.B. van Wyk Page: 172 - 177

Genetic parameters were estimated for 36-, 42-, 50-, 100- and 150-day weight in the South African Mutton Merino breed. The direct heritability estimates obtained were 0.270, 0.366, 0.278, 0.185 and 0.115 respectively. The maternal heritability estimates for the respective weights…

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