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"Experientia docet" - Experience is the best teacher

The value of kikuyu foggage for overwintering dry ewes

  • 2002
  • Issue: 1
  • Volume: 32
J.F. de Villiers, T.J. Dugmore, W.A. Botha and J.J. Wandrag Page: 7 - 13

Kikuyu (Pennisetum clandestinum) is a summer growing tropical pasture species well adapted to the Midlands of KwaZulu-Natal. Kikuyu foggage (standing hay) could play an important role in a fodder flow programme to sustain dry ewes during late winter after their…

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Effect of supplementation on reproduction of wet season kidding Tswana goats

  • 2002
  • Issue: 1
  • Volume: 32
O.R. Madibela, B.M. Mosimanyana, W.S. Boitumelo and T.D. Pelaelo Page: 14 - 22

Seventy-seven mature Tswana goats were used to investigate the effect of supplementation on reproduction of wet season kidding animals. Treatments groups with similar weights were: Unsupplemented Control (UC), Continuous Supplementation (CS), Before Rain Supplementation (BRS) and After Rain Supplementation (ARS).…

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Genetic parameter estimates of early growth traits in the Tygerhoek Merino flock

  • 2002
  • Issue: 2
  • Volume: 32
G. Duguma, S.J. Schoeman, S.W.P. Cloete and G.F. Jordaan Page: 66 - 75

Genetic parameters were estimated for birth weight (BWT), weaning weight (WWT) and pre-weaning average daily gain (ADG) using Restricted Maximum Likelihood (REML) procedures. Four different animal models were fitted, differentiated by including or excluding maternal effects. The direct heritability estimates…

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Genetic parameters of testicular measurements in Merino rams and the influence of scrotal circumference on total flock fertility

  • 2002
  • Issue: 2
  • Volume: 32
G. Duguma, S.W.P. Cloete S. J. Schoeman and G.F. Jordaan Page: 76 - 82

Genetic parameter estimates for scrotal circumference (SC), testis diameter (TD) and two-tooth liveweight (LW) were obtained for 1380 two-tooth Merino rams born from 1986 to 1998 on the Tygerhoek Experimental Farm. The effect of SC of service sires (n =…

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Effect of population structure and underlying magnitude of dominance genetic effects on the estimation of additive and dominance

  • 2002
  • Issue: 2
  • Volume: 32
D. Norris, I.L. Mao and R. J. Coetzee Page: 113 - 120

Five populations with varying percentages of animals in full-sib families were simulated. For each population, three combinations of additive and dominance genetic variances of different relative magnitudes were considered, thereby creating fifteen sub-populations. Constant residual variance was used in all…

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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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Diet selection priorities in growing pigs offered a choice of feeds

  • 2002
  • Issue: 2
  • Volume: 32
N.S. Ferguson, M.M.V. Bradford and R.M. Gous Page: 136 - 143

Two experiments were conducted to test whether young pigs are capable of discriminating against a feed based on its nutrient balance (or protein value) and/or the presence or absence of anti-nutritional factors and whether there is an order of preference.…

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Effect of fortifying amaranth diets with amino acids, casein and ethylene diamine tetraacetate on broiler performance, amino aci

  • 2002
  • Issue: 2
  • Volume: 32
L.W. Kabuage, P.N. Mbugua, B.N. Mitaru, T.A. Ngatia and K. Schafer Page: 144 - 153

Two broiler feeding trials (1-31 days of age) were carried out to determine the effect of fortifying grain amaranth diets with lysine, methionine, casein and ethylene diamine tetraacetate (EDTA) on performance, amino acid availability, plasma amino acids, nitrogen and mineral…

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