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"Experientia docet" - Experience is the best teacher

The formation of volatile N-nitrosamines in kikuyu grass silage

  • 1983
  • Issue: 1
  • Volume: 13
J.P. Marais Page: 2 - 3

Kikuyu grass (Pennisetum clandestinum) often contains high levels of nitrate and other NPN compounds. During silage fermentation it is likely that nitrosamines are formed which are well known carcinogens. An investigation on kikuyu silage confirmed the presence of at least…

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Supplementation of dairy weaners grazing tropical pastures

  • 1983
  • Issue: 1
  • Volume: 13
R.J. Moss, G.D. Chopping & P.N. Thurbon Page: 6 - 7

Experiments were carried out to determine the potential of tropical pastures for growth of dairy replacement heifers, and to assess the need for supplementation of growing animals grazing these pastures. Grain supplementation (1,4 kg maize/head/day) increased ADG to 0,62; 0,56…

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Pasture systems for milk production in northern Australia

  • 1983
  • Issue: 1
  • Volume: 13
P.N. Thurbon, G.D. Chopping, T.M. Davison & R.T. Cowan Page: 7 - 9

Substantial increases in milk production can be achieved using improved pastures. When grazed at lenient stocking rates ( <1,6 cows/ha) milk yields of Friesian cows was ca. 4000 L/lactation. Productivity per unit area is increased when fertilizer nitrogen is used to…

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Digestion of Medicago truncatula pasture by sheep

  • 1983
  • Issue: 1
  • Volume: 13
G.D. Denney, J.P. Hogan, J.R. Lindsay & P. Davis Page: 11 - 12

Reasons for low productivity of sheep grazing barrel medic (Medicago truncatula) were investigated based on studies of intake and digestion. Pasture analysis showed that barrel medic represented only 13 to 30% of the diet selected and this was similar to…

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Effect of supplementation on the digestibility of roughage diets

  • 1983
  • Issue: 1
  • Volume: 13
N.A. Todorov, E. Zagdsuren, R. Tserendulam & C. Badam Page: 13 - 16

Supplementation of low quality Mongolian hay and barley straw with urea, minerals and a small quantity (11 - 14% of total DM) of easily digestible carbohydrate had a positive influence on in vivo digestibility, increasing the net energy value of…

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Ammoniated maize residue for the fattening of lambs

  • 1983
  • Issue: 1
  • Volume: 13
W.W. Seed Page: 16 - 18

The use of ammoniated maize residue as a replacement for maize meal in the diet for fattening lambs, was investigated. Ammoniation of maize residue increased average daily DMI and ADG at the 0 and 20% concentrate levels. The feed conversions…

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Cane molasses and NaOH-treated bagacillo diets for lambs

  • 1983
  • Issue: 1
  • Volume: 13
C.F. Chicco, G. Garcia, C. Fernandez & C.R. Prays Page: 18 - 20

The effect of alkali-treated bagacillo in diets varying in proportion of bagacillo and molasses was studied in lambs. The bagacillo was treated with a concentrated solution of NaOH in a horizontal drum-type mixer to give a final concentration of 6%…

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Balance study on sheep fed with beet molasses solubles

  • 1983
  • Issue: 1
  • Volume: 13
B.F. Kania, G. Kulasek, H. Leonowicz, R. Krzeminski, M. Leontowicz & E. Sobczak Page: 21 - 22

A balance study was carried out to investigate digestibility and retention of major nutrients in wethers fed rations in which condensed beet molasses solubles (CBS) formed 27% of the dietary DM. Results showed that CBS contained 8,3 MJ of ME…

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Anatomical and nutritional adaptations in African rodents

  • 1983
  • Issue: 1
  • Volume: 13
M.R. Perrin & A.H. Maddock Page: 23 - 25

Anatomical and nutritional adaptations were studied in four African rodents (Cricetomys gambianus, Mystromys albicaudatus, Thallomys paedulcus and Saccostomus campestris). The  stomachs of all species are markedly sacculated with a highly modified corpus containing either numerous papillae or several diverticula and…

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Utilization of tropical forages and alfalfa meal by rabbits

  • 1983
  • Issue: 1
  • Volume: 13
P.R. Cheeke, D.J. Harris & N.M. Patton Page: 25 - 26

The productive performance of rabbits was evaluated on diets of alfalfa meal and tropical forages. The results showed that rabbits can utilize high forage diets with little or no cereal grain. Several tropical legumes (Desmodium distortum, Macroptilium lathyroides, Clitoria ternata…

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Digestion in the capybara (Hydrochoerus huydrochaeris)

  • 1983
  • Issue: 1
  • Volume: 13
A. Baldizan, R.M. Dixon & R. Parra Page: 27 - 28

A study was undertaken to examine the digestion and fermentation in the capybara (Hydrochoerus hydrochaeris) fed either forage or a predominantly concentrate diet. The large volume of digesta (3,66 and 2,73 kg), pH (6,6 and 6,3), NH3 - N (78…

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Fibre digestion in the hyrax

  • 1983
  • Issue: 1
  • Volume: 13
A.K. Eloff Page: 28 - 30

Transit time and digestibility of two diets differing in fibre content were studied using captive hyrax (Procavia capensis). Significant negative correlations were found between transit time and NDF content of the diets. During these studies the hindgut played a major…

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Aspects of the digestion in the Cape porcupine

  • 1983
  • Issue: 1
  • Volume: 13
A.S. van Jaarsveld Page: 31 - 33

The digestive capabilities of the Cape porcupine (Hystrix africaeaustralis) were studied using captive and field animals. The stomach contents comprised 6,47% of the body mass and had a low pH (2,0).The Cape porcupine also has a long small intestine (670…

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Aspects of the feeding ecology of a browsing ruminant: the kudu

  • 1983
  • Issue: 1
  • Volume: 13
N. Owen-Smith, S.M. Cooper & P.A. Novellie Page: 35 - 38

Forbs form the preferred dietary component of the kudu (Tragelaphus strepsiceros). This preference was associated with the high nutrient content of their leaves and less fibrous stem material relative to trees and shrubs. Woody browse was most sought after during…

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Food selection in the blesbok on pasture with low plant diversity

  • 1983
  • Issue: 1
  • Volume: 13
W. Killian & N. Fairall Page: 38 - 40

Factors influencing food plant selection by the blesbok (Damaliscus dorcas) were studied in an area with simple plant composition. Dicanthium pyllosum leaves were specifically selected by the blesbok. Cuticle analysis gave a ratio of 1 Dicanthium to 1,85 of all…

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