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"Experientia docet" - Experience is the best teacher

Phenotypic and genetic aspects of production in the Dohne Merino II Estimation of heritabilities of production traits

  • 1982
  • Issue: 1
  • Volume: 12
A.J. Fourie & H.J. Heydenrych Page: 61 - 64

Production data of 366 individuals in the Dohne Merino Development programme at the Dohne Agricultural Research Institute, were used for the estimation of the heritabilities of 15 production traits. Halfsib analyses were applied to data corrected for identifiable environmental factors…

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Test-day models for South African dairy cattle for participation in international evaluations

  • 2006
  • Issue: 1
  • Volume: 36
B.E. Mostert, H.E. Theron, F.H.J. Kanfer and E. van Marle-Köster Page: 58 - 70

Variance components and breeding values of production traits and somatic cell score of South African Guernsey, Ayrshire, Holstein and Jersey breeds have been estimated using a multi-lactation repeatability test-day model, including tests of the first three lactations as repeated measures…

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Phenotypic characterization of indigenous chickens in Lesotho in the pre-laying phase

  • 2004
  • Issue: 6
  • Volume: 34
A.M. Nthimo, F.W.C. Neser, J.E.J. du Toit, M.D. Fair and W. Odenya Page: 125 - 127

Production traits of chickens of the Lesotho line, namely: body weight, body weight gain, feed conversion ratio (FCR) and mortality, were compared with four South African indigenous lines (Ovambo, Potchefstroom Koekoek, Lebowa-Venda and Naked Neck) and two exotic lines (Rhode…

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Genetic parameter estimates in the South African Jersey breed

  • 1998
  • Issue: 3
  • Volume: 28
J. duToit, J.B. van Wyk and J. van der Westhuizen Page: 146 -

Data obtained from the INTERGIS for Jersey breeders participating in the NationalDairy Cattle Performance and Progeny Testing Scheme were analysed. The registered and grade records commenced in test year 1977 through 1992 (incomplete) and consisting of lactations between 240 and…

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