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"Experientia docet" - Experience is the best teacher

Crossbreeding to increase beef production: additive and non-additive effects on weight traits

  • 2013
  • Issue: 2
  • Volume: 43
A. Theunissen, M.M. Scholtz, F.W.C. Neser & M.D. MacNeil Page: 143 - 152

Using breed differences effectively facilitates high productivity and profitability. Thus, the objective of the study was to estimate direct and maternal additive and heterosis effects for growth traits (birth weight, weaning weight, 19-month weight of heifers and cow weight) from…

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Across flock genetic parameter estimation for yearling body weight and fleece traits in the South African Dohne Merino populatio

  • 2008
  • Issue: 1
  • Volume: 38
J.B. van Wyk, J.W. Swanepoel, S.W.P. Cloete, J.J. Olivier and G.J. Delport Page: 31 - 37

Accurate genetic parameter estimates are needed upon which to perform multiple-trait across flock breed analyses. Genetic parameters for yearling body weight (BW), clean fleece weight (CFW) and mean fibre diameter (MFD) were estimated using records of 107 389 individuals (the…

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Genetic parameter estimation of 16-month live weight and objectively measured wool traits in the Tygerhoek Merino flock

  • 2009
  • Issue: 1
  • Volume: 39
P.A. Matebesi, S.W.P. Cloete and J.B. van Wyk Page: 73 - 82

Genetic evaluation systems require the accurate estimation of genetic parameters. The genetic, phenotypic and environmental parameters for live weight and objectively measured wool traits were estimated for a South African Merino flock. Records of the Tygerhoek Merino resource flock were…

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Long-term selection experiment with Afrikaner cattle 2. Genetic parameters and genotype x environment interaction for calf growt

  • 2009
  • Issue: 2
  • Volume: 39
L.M. Beffa, J.B. van Wyk and G.J. Erasmus Page: 98 - 105

A selection and line x environment interaction study with grade Afrikaner cattle was established in 1956 at Matopos Research Station, Zimbabwe. Two selection lines of 100 cows each were reared in different management environments. The non-supplemented (NS) line relied on…

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Genetic parameter estimates of early growth traits in the Tygerhoek Merino flock

  • 2002
  • Issue: 2
  • Volume: 32
G. Duguma, S.J. Schoeman, S.W.P. Cloete and G.F. Jordaan Page: 66 - 75

Genetic parameters were estimated for birth weight (BWT), weaning weight (WWT) and pre-weaning average daily gain (ADG) using Restricted Maximum Likelihood (REML) procedures. Four different animal models were fitted, differentiated by including or excluding maternal effects. The direct heritability estimates…

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Genetic parameter estimates for growth traits of Large White pigs in Kenya

  • 2008
  • Issue: 3
  • Volume: 38
E.D. Ilatsia, M.G. Githinji, T.K. Muasya, T.O. Okeno and A.K. Kahi Page: 166 - 173

Variance components and genetic parameter were estimated for piglet growth traits of Large White (LW) pigs managed under intensive production systems in Kenya. Data were on piglet performance of LW pigs born between 1982 to 1996. Growth performance traits of…

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Variance components and genetic parameters for body weight and fleece traits of Merino sheep in an arid environment

  • 1996
  • Issue: 1
  • Volume: 26
M.A. Snyman, J.J. Olivier and W.J. Olivier Page: 11 - 14

Data collected on the Carnarvon Merino flock over the period 1962 to 1983 were used for this study. Variance components resulting from direct additive genetic effects, maternal additive genetic effects, maternal permanent environmental effects, as well as the relationship between…

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