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"Experientia docet" - Experience is the best teacher

Genetic parameter estimates for tick resistance in Bonsmara cattle

  • 2009
  • Issue: 4
  • Volume: 39
M.A. Budeli, K.A. Nephawe, D. Norris, N.W. Selapa, L. Bergh and A. Maiwashe Page: 321 - 327

The objectives of the study were to estimate genetic parameters for tick resistance and to evaluate the effect of the level of tick infestation on the estimates of genetic parameters for South African Bonsmara cattle. Field data of repeated tick…

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Variance component and heritability estimates for first and second lactation milk traits in the South African Ayrshire breed

  • 1998
  • Issue: 1
  • Volume: 28
G.J. Hallowell, J. van der Westhuizen and J.B. van Wyk Page: 46 -

For the estimation of additive and error variances and resulting heritability estimates 9 050 first and 5 541 second lactation records were used. Analyses were conducted using DFREML procedures. The heritabilities for first (and second) lactation for milk, fat and…

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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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