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"Experientia docet" - Experience is the best teacher

Phenotypic and genetic parameters for selected production and reproduction traits of Mpwapwa cattle in low-input production systems

  • 2017
  • Issue: 3
  • Volume: 47
A.R. Chawala, G. Banos, D.M. Komwihangilo, A. Peters & M.G.G Chagunda Page: 307 - 319

The objective of this study was to assess the genetic improvement programme of the Mpwapwa dairy cattle breed over the past four decades,  based on on-station selection and breeding. Estimates of genetic parameters and genetic trends for total lactation milk…

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The effect of Phantom Parent Groups on Genetic Trend Estimation

  • 2002
  • Issue: 2
  • Volume: 32
H.E. Theron, F.H.J. Kanfer and L. Rautenbach Page: 130 - 135

In an animal model evaluation of breeding values it is assumed that the base animals are all at the same genetic level. However, in the South African Holstein population, animals of different genetic levels were imported from foreign countries, thus…

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Results of 23 years of selection for post-weaning weight in a Caracu beef herd

  • 2008
  • Issue: 2
  • Volume: 38
M.C. Pereira, M.E.Z. Mercadante, A.G. Razook, L.A. Figueiredo and L.G. Albuquerque Page: 136 - 144

Data from 1 698 animals belonging to an experimental Caracu herd were analysed with the objective of calculating the population selection differentials, generation intervals, effective size and inbreeding coefficients, and to estimate the direct and correlated responses for growth traits…

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Environmental and genetic trends in clean fleece mass, live mass and fibre diameter in selection and control flocks involving a

  • 1992
  • Issue: 2
  • Volume: 22
S.W.P. Cloete, G.J. Delport, G.J. Erasmus, J.J. Olivier, H.J. Heydenrych and E. du Toit Page: 50 - 57

This study was undertaken to investigate the genetic stability of an unselected Control Group of South African Merino sheep and genetic change in a flock selected for increased clean fleece mass (Selection Group) under the same environmental conditions. Data regarding…

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