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"Experientia docet" - Experience is the best teacher

Relationship of ewe reproduction with subjectively assessed wool and conformation traits in the Elsenburg Merino flock

  • 2018
  • Issue: 1
  • Volume: 48
P. A. M. Matebesi-Ranthimo, S. W. P. Cloete, J. B. van Wyk & J. J. Olivier Page: 29 - 38

Subjectively assessed wool and conformation traits are widely used to select breeding ewes and rams in the sheep industry. Data from a Merino flock that is maintained at Elsenburg Research Farm were used to investigate animal model (co)variance components for…

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The relationships between faecal worm egg count and subjectively assessed wool and conformation traits in the Tygerhoek Merino flock

  • 2014
  • Issue: 3
  • Volume: 44
P.A.M. Matebesi-Ranthimo, S.W.P. Cloete, J.B. van Wyk & J.J. Olivier Page: 220 - 227

Subjectively assessed wool and conformation traits form part of the selection objective in wool sheep enterprises. The present study investigated the genetic, phenotypic and environmental correlations for nematode resistance (using faecal worm egg count (FEC)) with subjectively assessed wool and…

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Genetic parameters and relationships of faecal worm egg count with objectively measured wool traits in the Tygerhoek Merino flock

  • 2014
  • Issue: 2
  • Volume: 44
P.A.M. Matebesi-Ranthimo, S.W.P. Cloete, J.B. van Wyk & J.J. Olivier Page: 178 - 188

The costs of internal parasite control and treatment are potentially very high in grazing sheep. Faecal worm egg count (FEC) has been suggested as a suitable criterion for selection for resistance to nematode infestation in livestock. Genetic parameter estimates for…

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The allometric–autoregressive model in genetic studies: Heritabilities and correlations in the rat

  • 1981
  • Issue: 2
  • Volume: 11
M.M. Scholtz & C.Z. Roux Page: 69 - 76

The allometric-autoregressive quantification of growth and efficiency divides rat growth into 3 different physiological phases. Significant differences between families for some of these parameters existed. Consequently, heritabilities and, phenotypic and genetic correlations of the different parameters were estimated. Significant heritabilities…

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Relationships of subjectively assessed wool and conformation traits with objectively measured wool and live weight traits in the

  • 2009
  • Issue: 3
  • Volume: 39
P.A. Matebesi, J.B. van Wyk and S.W.P. Cloete Page: 188 - 196

Records of the Tygerhoek Merino resource flock were used to estimate genetic, phenotypic and environmental parameters between subjective wool and conformation traits with objective wool and live weight traits. The database contained records of 4 495 animals, the progeny of…

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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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Comparison of breeding values and genetic trends for production traits estimated by a Lactation Model and a Fixed Regression Tes

  • 2006
  • Issue: 2
  • Volume: 36
B.E. Mostert, H.E. Theron, F.H.J. Kanfer and E. van Marle-Köster Page: 71 - 78

A comparison of breeding values and genetic trends of production traits from two models is made. One set of breeding values and trends was estimated by the September/October 2003 South African National Genetic Evaluation, using a Lactation Model (LM). 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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