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"Experientia docet" - Experience is the best teacher

Control of feed intake as affected by previous treatment

  • 1983
  • Issue: 1
  • Volume: 13
J.P. Pienaar, H.S. Hofmeyr & G.L. Whiteford Page: 45 - 46

An experiment was conducted with eighteen rumen cannulated sheep fed on a chopped lucerne diet. Previous level of intake significantly influenced the level at which sheep initially established voluntary feed intake. This difference had disappeared after three weeks on an…

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Influence of roughages on rumen retention time of concentrates

  • 1983
  • Issue: 1
  • Volume: 13
J.P. Campher, C.Z. Roux & H.H. Meissner Page: 48 - 50

The effect of roughages on the retention time of concentrates in the rumen was studied in cattle and sheep fed diets with different concentrate:roughage ratios. The organic matter retention times were calculated from the ratio, OM content in the rumen/mean…

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An enzymatic approach to cell wall structure

  • 1983
  • Issue: 1
  • Volume: 13
R.E. Hungate, R.J. Stack, L.C. Greve & J.L. Labavitch Page: 51 - 52

Ruminococcus albus was incubated with isolated alfalfa cell wall material for 72 h in batch culture. Cellulose in the cell walls was digested to a somewhat greater extent (88%) than were the fermentable sugars of the hemicellulose fraction (62 -…

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Media lacking rumen fluid for enumeration of rumen bacteria

  • 1983
  • Issue: 1
  • Volume: 13
S.K. Baker & R.J. Moir Page: 54 - 57

A medium without rumen fluid but containing trypticase, hemin and volatile fatty acids was developed for the enumeration of rumen bacteria. Counts of total culturable and amylolytic bacteria were as high or higher than those obtained using  medium CC (Zeigler-Leedle…

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Nutritionally fastidious Ruminococcus flavefaciens strains

  • 1983
  • Issue: 1
  • Volume: 13
C.E.G. Roché, G.S. Miller & A. Kistner Page: 57 - 59

The majority of Ruminococcus flavefaciens strains isolated in our laboratories failed to grow or grew poorly both in rumen fluid medium and in a chemically defined medium containing all the nutrients reported to be required for good growth of this…

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Rumen fungal degradation of Digitaria pentzii

  • 1983
  • Issue: 1
  • Volume: 13
D.E. Akin, G.L.R. Gordon & J.P. Hogan Page: 62 - 63

The intake of Digitaria pentzii grown with sulphur fertilizer (0,14%; + S) was almost 50% higher than that of unfertilized forage (0,08%; - S). Results showed no differences in plant anatomy or in rumen bacterial populations in sheep fed +…

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Colorimetric determination of in vitro feed protein degradation

  • 1983
  • Issue: 1
  • Volume: 13
P.B. Cronjé & R.I. Mackie Page: 63 - 65

A colorimetric method for determining protein degradation using a diazonium chromophore was compared with the Dacron bag technique. Diazotized fish meal, maize gluten meal and soya-bean were incubated with strained rumen fluid and a suitable growth medium. Only 49% and…

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Adaptation effects of ionophores on rumen fermentation

  • 1983
  • Issue: 1
  • Volume: 13
A. de Jong & F. Berschauer Page: 67 - 70

The effect of monensin on the in vitro degradation of cellulose was investigated using ruminal fluid obtained from sheep adapted and unadapted to the antibiotic. In vivo ruminal adaptation to monensin was also examined over a six-week treatment period. Results…

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A comparison of lipolysis and lipogenesis in sheep and rats

  • 1983
  • Issue: 1
  • Volume: 13
S.L. Campbell & J.G. van der Walt Page: 73 - 75

Hormone sensitive lipase is thought to be the rate-limiting enzyme of lipolysis; phosphatidate phosphohydrolase that of lipogenesis. Both these enzyme systems were studied in vitro with the addition of epinephrine. The results show that: (a) hormone sensitive lipase is four…

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Homeorhetic hormones, metabolites and accelerated growth

  • 1983
  • Issue: 1
  • Volume: 13
A.L. Marais & J.G. van der Walt Page: 76 - 78

Six newly weaned karakul ewes, three with fat tails and three without tails, were used to investigate the metabolic and hormonal changes during accelerated growth. Two lambs acted as controls, while the remaining four were Subjected to a maintenance diet…

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Integration of metabolism and digestion in the hyrax

  • 1983
  • Issue: 1
  • Volume: 13
N. Fairall, A.K. Eloff & I.S. McNairn Page: 79 - 80

Metabolic adaptations and digestive ability were integrated to explain the ecological efficiency of the hyrax (Procavia capensis). Metabolic rate was shown to decrease linearly with a drop in ambient temperature, but at a lower rate than an animal of equivalent…

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