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"Experientia docet" - Experience is the best teacher

Predicting the risk of mineral deficiencies in grazing animals

  • 1988
  • Issue: 1
  • Volume: 18
N.F. Suttle Page: 15 - 22

Problems relating to the anticipation and elimination of poor production due to mineral deficiencies in grazing livestock will be examined in this paper. Its concern is with subclinical problems rather than catastrophic clinical problems. The ways in which hypothetical models…

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The establishment of a protein degradability data base for dairy cattle using the nylon bag technique. 1. Protein sources

  • 1988
  • Issue: 1
  • Volume: 18
L.J. Erasmus, J. Prinsloo & H.H. Meissner Page: 23 - 29

The protein degradability of various South African ruminant feed protein sources was determined in the rumen of cannulated lactating dairy cattle. The effective protein degradability was calculated at different fractional outflow rates, using the nylon bag technique. The degradability values…

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Protein digestion in ruminants

  • 1988
  • Issue: 1
  • Volume: 18
J.G. van der Walt and J.H.F. Meyer Page: 30 - 41

Although the protein requirement of domestic ruminants may be calculated from a simple one-compartment model, this approach ignores factors such as microbial fermentation in the rumen and the non-equality of feed proteins. By examining digestion in each of the functional…

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The effect of an induced copper deficiency on the total plasma copper and unconjugated plasma progesterone concentrations during

  • 1988
  • Issue: 3
  • Volume: 18
F.E. van Niekerk, C.H. van Niekerk & J.C. Morgenthal Page: 83 - 87

The effect of a copper deficiency on certain aspects of reproduction in ewes was investigated. An effective copper deficiency was induced by using the copper antagonists cadmium, calcium and sulphate. An average decline in the plasma copper concentration from 160…

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The effect of supplementation on milk yield in Boer goat ewes

  • 1988
  • Issue: 3
  • Volume: 18
J.G. Raats Page: 97 - 100

The effect of supplementation on the milk production of Boer goat ewes maintained under veld conditions (grass-/bush community) was studied over a 12-week lactation period. An average of 625 g concentrates was consumed per ewe per day. Supplemented ewes produced…

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Die potensiaal van chemies behandelde fluitjiesriet (Phragmites australis)-hooi in onderhoudsdiëte vir skape. 2. ’n Vergelykin

  • 1988
  • Issue: 3
  • Volume: 18
J.P. Swiegers & H.H. Meissner Page: 107 - 112

The potential of chemically treated common reed (Phragmites australis) hay in maintenance diets for sheep. 2. A comparison between NaOH treatment and ammoniation with or without molasses with respect to digestibility, intake and nitrogen retention. A digestibility experiment was conducted…

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