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"Experientia docet" - Experience is the best teacher

The potential of the weed, Commelina diffusa L., as a fodder crop for ruminants (Short communication)

  • 2006
  • Issue: 1
  • Volume: 36
T.P. Lanyasunya, Wang, H. Rong, S.A. Abdulrazak, E.A. Mukisira and Zhang jie Page: 28 - 32

The objective of this study was to evaluate the potential of Commelina diffusa L. as a ruminant feed. Commelina diffusa belongs to the Commelinaceae family, a family of plants that is generally poorly investigated with respect to ruminant nutrition. The…

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The effects of dietary energy and protein concentrations on ostrich skin quality (Short communication)

  • 2006
  • Issue: 1
  • Volume: 36
S.W.P. Cloete, S.J. van Schalkwyk, T.S. Brand, L.C. Hoffman and C.J. Nel Page: 40 - 44

The effects were investigated of energy and protein concentrations (with associated amino acid concentrations) in ostrich diets on leather quality of the skins of 50 ostriches. Energy concentrations were 9.0, 10.5 and 12.0 MJ ME/kg diet and protein concentrations were…

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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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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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Heritability of live weight and condition score in a Holstein herd and correlations with milk traits – preliminary estimates

  • 2006
  • Issue: 2
  • Volume: 36
C.J.C. Muller, S.W.P. Cloete, J.J. Olivier, J.A. Botha and H. de Waal Page: 79 - 88

Genetic and environmental parameters for live weight and condition score have been determined for Holstein cows. Genetic correlations with milk traits were also derived. Monthly records were modelled by cubic splines, while the direct, additive effects of animal and the…

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Influence of reproduction traits and pre-weaning growth rate on herd efficiency of different beef breed types in an arid sub-tro

  • 2006
  • Issue: 2
  • Volume: 36
I. du Plessis, L.C. Hoffman and F.J. Calitz Page: 89 - 98

The efficiency of Simmentaler cross (SX), Bonsmara cross (BX), Afrikaner (AF) and Nguni (NG) cowherds to produce weaner calves under natural sweetveld conditions was investigated. The respective cowherds were selected to differ with regard to frame size (SX > BX…

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The effect of concentrate supplementation on the productivity of grazing Jersey cows on a pasture based system

  • 2006
  • Issue: 2
  • Volume: 36
R. Meeske, A. Rothauge, G.D. van der Merwe and J.F. Greyling Page: 105 - 110

The effect of concentrate feeding on milk production, milk composition, live weight, condition score and intercalving period of 60 Jersey cows grazing high quality pastures over two lactations was determined. Cows were fed at a no (NC), low (LC), medium…

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In vitro degradability and gas production parameters of Sericea lespedeza (Lespedeza cuneata) mixed with varying types and level

  • 2006
  • Issue: 2
  • Volume: 36
J.O. Ouda, I.V. Nsahlai and P.M. Mahundu Page: 111 - 121

Sericea lespedeza (Lespedeza cuneata) regrowth was harvested at early (ELP) or late (LLP) flowering stages, mixed with varying types and levels of roughage and fermented for 72 h in vitro, using the gas production (GP) technique. The roughage : lespedeza…

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QTL analysis of production traits on SSC3 in a Large White x Meishan pig resource family (Short communication)

  • 2006
  • Issue: 2
  • Volume: 36
B. Zuo, Y.Z. Xiong, Y.H. Su, C.Y. Deng, M.G. Lei, F.E. Li, R. Zheng and S.W. Jiang Page: 122 - 125

In order to locate the genetic regions that are responsible for economically important traits, a resource population was established by crossing Large White boars and Meishan sows. Phenotypic data of a total of 287 F2 offspring were collected from 1998…

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Utilisation of synthetic amino acids by broiler breeder hens

  • 2006
  • Issue: 2
  • Volume: 36
M.K. Nonis and R.M. Gous Page: 126 - 134

This study was conducted to examine the response of broiler breeder hens to feeds supplemented with synthetic lysine and methionine when fed once or twice daily during peak production. Replacing intact protein with increasing amounts of free lysine and methionine,…

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