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"Experientia docet" - Experience is the best teacher

Ram fertility unaffected by high molybdenum intakes

  • 1990
  • Issue: 1
  • Volume: 20
J.B.J. van Ryssen, A.W. Lishman and J.P. Kitching Page: 10 - 15

Two trials were conducted to determine the effect of dietary molybdenum (Mo) on the fertility of young rams, when fed for ca. 14 weeks to prevent copper (Cu) toxicity. In the first trial, the sexual development of young weaner rams…

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Energy deficiency in kikuyu grass containing high levels of nitrogen

  • 1990
  • Issue: 1
  • Volume: 20
J.P. Marais, D.L. Figenschou and G.A.J. Woodley Page: 16 - 20

Elevated rumen ammonia levels in sheep on high nitrogen kikuyu (Pennisetum clandestinum Hochst) grass were indicative of a protein/energy imbalance in the grass. To correct the imbalance, grass containing 22% crude protein required maize meal supplementation of at least 20%…

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Medium-term responses to and changes in fitness with selection for parameters of the allometric-autoregressive model

  • 1990
  • Issue: 2
  • Volume: 20
M.M. Scholtz, C.Z. Roux, D.S. de Bruin and S.J. Schoeman Page: 65 - 70

The allometric-autoregressive model describes growth accurately and is useful in the characterization of growth responses. Hence, the potential of the model for selection was investigated. Rats were used in a selection experiment, where selection was practised for slope (b) and…

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