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"Experientia docet" - Experience is the best teacher

Evidence for a functional role of the pineal in bovines

  • 1974
  • Issue: 1
  • Volume: 4
M.M.M. Hayes, B.K. Knight and R.B. Symington Page: 55 - 60

The possibility that the pineal exerts a regulatory influence on the gonadotrophic function of the adenohypophysis was investigated using in vitro techniques. Additionally, since a direct negative feedback of pituitary LH onto the hypothalamus occurred when adenohypophysial and hypothalamic tissues…

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The response of muscle cells during compensatory growth in rats

  • 1974
  • Issue: 1
  • Volume: 4
A.M. Stewart Page: 75 - 79

This study was concerned with the cellular growth of muscle tissue in rats during the early stages of recovery from undernutrition. Groups of animals were undernourished either pre- or post-weaning and realimentated on either unrestricted intakes or on a restricted…

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The relationship between size and efficiency in the beef cow

  • 1974
  • Issue: 1
  • Volume: 4
J.D.G. Steenkamp and C. van der Horst Page: 81 - 91

The efficiencies of small (<420 kg), medium (455 - 490 kg) and large (>525 kg) size grade Africander cows were compared for reproductive performance of cow, survival rates, growth of progeny and overall profitability. Cow efficiency index (C.E.I.) calculated by…

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Automatic collection of bovine blood samples

  • 1974
  • Issue: 1
  • Volume: 4
D.H. Hale Page: 93 - 95

A technique is described which allows automatic collection of jugular venous blood from tethered cows. In this system, blood is pumped continuously from an intravenous cannula which has a double lumen while an anticoagulant is pumped through the second opening.…

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Utilization of protein from opaque -2 Maize by chicken and rat

  • 1974
  • Issue: 2
  • Volume: 4
J.J. du Preez, H.O. Gevers, G.V. Quicke & R.M. Gous Page: 97 - 101

Opaque -2 maize gave significantly better nett protein utilisation (NPU) values than normal maize varieties in trials performed with rats and chickens. Altogether seven varieties of maize were tested of which three carried the opaque -2 gene and these proved…

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Die vitamien A-status van beeste op Elsenburg

  • 1974
  • Issue: 2
  • Volume: 4
J.J. Erasmus en F.J. van der Merwe Page: 103 - 107

The vitamin a-status of cattle at Elsenburg The B-carotene concentrations in feeds and feed mixtures used for calf- and heifer feeding were determined and a survey of the B-carotene and vitamin A concentrations in the plasma and livers of calves…

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Voerstelsels vir superlamproduksie

  • 1974
  • Issue: 2
  • Volume: 4
A.J. van Heerden en J. Reyneke Page: 121 - 125

Eighty Dohne Merino lambs were divided into 4 groups to investigate the effect of different succulent feeds and concentrates given to ewes and lambs on veld grazing. From the time of lambing ewes received the following supplementary rations per head…

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