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"Experientia docet" - Experience is the best teacher

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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Economic weights for Holstein Friesian traits in South Africa

  • 1998
  • Issue: 3
  • Volume: 28
Mariette du Plessis and C.Z. Roux Page: 140 -

In this study economic weights for production and functional traits of the HolsteinFriesians in South Africa were calculated using a simulation model. The production traits were milk, butterfat, protein and lactose yield and the functional traits included feed efficiency, survival…

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An investigation into possible genotype x environment interactions for weaning weight in South African Mutton Merino sheep

  • 1998
  • Issue: 3
  • Volume: 28
F.W.C. Neser, G.J. Erasmus, J.B. van Wyk, C.S. van Deventer Page: 179 -

Weaning weight records available for the South African Mutton Merino breed wereutilised to investigate the possibility of a genotype by environment interaction in the breed. A direct heritability estimate of 0.308 ± 0.022 was obtained. Including flock-year-season x sire interaction…

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An evaluation of Bana, Greengold and Pennaris.

  • 1998
  • Issue: 2
  • Volume: 28
T.D. de Bruyn and W.A. van Niekerk Page: 60 -

The objective was to study the partial digestion by sheep of the 500-mm regrowthof three Pennisetum selections (Bana, Greengold and Pennaris) over three seasons (autumn, spring and summer). There were no differences (p > 0.05) between selections in the quality…

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Ruminal VFA production rates, whole body metabolite kinetics

  • 1998
  • Issue: 2
  • Volume: 28
M. J. Linington, J.H.F. Meyer, J.G. van der Walt Page: 82 -

Ten Dohne merino wethers with an average mass of 50 kg, were used to study differencesin ruminal VFA production rates, whole body kinetics of VFA, glucose and FFA as well as blood hormone concentrations when fed a high- or a…

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Mitochondrial DNA analysis of two Southern African

  • 1998
  • Issue: 2
  • Volume: 28
S.C. Parfitt, H.H. Huismans Page: 67 -

Mitochondrial DNA cleavage patterns from representative animals of the Afrikanerand Nguni sanga cattle breeds, indigenous to Southern Africa, were compared to the mitochondrial DNA cleavage patterns of the Brahman (zebu) and the Jersey (taurine) cattle breeds. Identical restriction patterns were…

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Quantifying herd-year-season x sire interaction in Bonsmara cattle

  • 1998
  • Issue: 3
  • Volume: 28
F.W.C. Neser, G.J. Erasmus and J.B. van Wyk, C.S. van Deventer Page: 167 -

In an effort to quantify herd-year-season x sire interaction in Bonsmara cattle, four differentmodels were fitted to the data used in Neser et a/. (1996). The herds were also divided into two (bushveld and sour grassveld) regions in order to…

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