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"Experientia docet" - Experience is the best teacher

Establishment of a ruminal protein degradation data base for dairy cattle using the in situ polyester bag technique. 2. Energy

  • 1990
  • Issue: 3
  • Volume: 20
L.J. Erasmus, J. Prinsloo, P.M. Botha and H.H. Meissner Page: 124 - 129

The extent of ruminal protein degradation of 11 energy sources was determined in the rumen of cannulated lactating dairy cows, and was calculated at three different fractional outflow rates, using the in situ polyester bag technique. The extent of ruminal…

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Establishment of a ruminal protein degradation data base for dairy cattle using the in situ polyester bag technique. 3. Roughag

  • 1990
  • Issue: 3
  • Volume: 20
L.J. Erasmus, J. Prinsloo, P.M. Botha and H.H. Meissner Page: 130 - 135

The extent of ruminal protein degradation of 13 roughages was determined in the rumen of cannulated lactating dairy cows, and was calculated at three different fractional outflow rates using the in situ polyester bag technique. Values ranged from 25,5% for…

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Plasma copper, zinc and blood selenium concentrations of sheep, goats and cattle (Short communication)

  • 1990
  • Issue: 3
  • Volume: 20
F.E. van Niekerk, S.W.P. Cloete, S.A. Barnard and E.W.P. Heine Page: 144 - 147

Concentrations of plasma copper, plasma zinc and blood selenium in sheep, goats and cattle, grazing together on natural pastures, were determined at two- to three-monthly intervals over a two-year period. Cattle had the lowest plasma copper concentrations, but no definite…

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Relationship between nitrogen and other chemical components in kikuyu grass from long-established pastures (Short communication)

  • 1990
  • Issue: 3
  • Volume: 20
J.P. Marais Page: 147 - 151

The relationship between nitrogen and other components in kikuyu grass (Pennisetum clandestinum) from long-established pastures was investigated. Leaf material, when compared to stem tissue, was higher in total organic nitrogen and protein content, but lower in non-protein organic nitrogen, nitrate,…

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A note on the dependence of juvenile marron, Cherax tenuimanus (Smith) (Decapoda: Parastacidae), on filter feeding (Short commun

  • 1990
  • Issue: 3
  • Volume: 20
R.A. van der Berg, H.J. Schoonbee and H.H. du Preez Page: 152 - 153

Problem areas in the production of Cherax tenuimanus, a freshwater crayfish (the 'marron') introduced to South Africa from Australia , are outlined. The high juvenile mortality rate problem is discussed. With reference to the morphology of the mouthparts of the…

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Meat studies of indigenous Southern African cattle. II. Textural evaluation of ribcut samples from carcasses of Afrikaner, Ngun

  • 1990
  • Issue: 4
  • Volume: 20
N.H. Casey, J. Swanepoel, J.F. de Bruyn and R.T. Naudé Page: 188 - 192

Textural evaluations were conducted on the longissimus thoracis muscles from carcasses of young Afrikaner, Nguni and Pedi bulls fed intensively and slaughtered at 160, 290, 340 and 390 kg. Carcasses were stimulated electrically (500 V, 12,5 Hz) for 2 min,…

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Puberty and the induction of puberty in female boer goat kids

  • 1990
  • Issue: 4
  • Volume: 20
P.C. Greyling and C.H. van Niekerk Page: 193 - 200

Female Boer goat kids were randomly allocated (post weaning) to 2 X 3 factorial design experiments for two observation periods, to monitor puberty and the induction thereof. Treatments for each period (December and April weaning seasons respectively) included three male…

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The use of pigs both intact and with ileo-rectal anastomosis to estimate the apparent and true digestibility of amino acids in u

  • 1990
  • Issue: 4
  • Volume: 20
T.S. Brand, H.A. Badenhorst, F.K. Siebris and J.P. Hayes Page: 223 - 228

This experiment was conducted to determine apparent and true amino acid digestibilities of untreated (BPS), heat-treated (HBPS) and thermal-ammoniated (NH3BPS) high-tannin sorghum with pigs both intact and with an ileo-rectal anastomosis (IRA). The mean endogenous protein secretion for the surgically…

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