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"Experientia docet" - Experience is the best teacher

A note on the phenotypic relationship between 18-month mating mass and average lifetime reproductive performance of Merino ewes

  • 1986
  • Issue: 2
  • Volume: 16
S.W.P. Cloete & H.J. Heydenrych Page: 97 - 99

        The relationship between 18-month mating mass and average lifetime conceptions/mating (Ec/Em), lambs born/conception (Lb/Ec), lambs born/mating(Lb/Em), preweaning mortalities/Iamb born (Ld/Lb) and lambs weaned/mating (Lw/Em) was investigated with data from 1222 Merino ewes available for at least…

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Genetic progress in the poultry industry

  • 1986
  • Issue: 3
  • Volume: 16
R.M. Gous Page: 127 - 133

In this article progress attributable to genetic selection in the poultry industry is discussed in three sections: genetic progress in broilers and broiler breeders, in laying hens, and in disease resistance. Selection methods are evaluated and future objectives are suggested.…

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Education and research in animal and grassland production

  • 1986
  • Issue: 3
  • Volume: 16
N.M. Tainton Page: 134 - 136

In spite of the obvious interdependence of animals and grasslands, both education and research in South Africa have been largely intra- rather than interdisciplinary. There are a number of possible reasons for this. Universities find it difficult to train prospective…

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The effect of compensatory growth on body composition in sheep

  • 1986
  • Issue: 4
  • Volume: 16
J.C. Greeff, H.H. Meissner, C.Z. Roux & R.J. Janse van Rensburg Page: 162 - 168

Sixty Merino lambs were randomly allotted to one of six feeding levels. The feeding levels were ad libitum (control) and 0,82; 0,72; 0,65; 0,55 and 0,45 of ad libitum. The feeding levels were calculated from the average weekly feed intake…

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Influence of different combinations of urea and low ruminal degradable protein sources on performance of high-producing dairy co

  • 1986
  • Issue: 4
  • Volume: 16
L.J. Erasmus, H.P. de Bruin, J.T. Grové, M.H. Neitz & H.H. Meissner Page: 169 - 176

Three complete diets with crude protein 16% and energy value 9,4 MJ ME/kg DM were formulated using different combinations of high and low-degradable protein sources. Diet A was formulated with only natural protein sources (55% UDP), diet A1 contained 1,6%…

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Evaluering van Suid-Afrikaanse proteïenbronne: Gebruik van kleurbinding as maatstaf van proteïenkwaliteit in vismele

  • 1986
  • Issue: 4
  • Volume: 16
G.A. Smith, J.P. Hayes & N. Smith Page: 177 - 182

Evaluation of South African protein sources: Use of dye-binding as measure of protein quality in fish-meal South African fish-meals differing in origin, composition and conditions of processing were evaluated for protein content, dye-binding capacity, dye-binding lysine, f1uorodinitrobenzenereactive lysine (FDNB), protein…

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