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  • Cambridge University Press  (2)
  • 2000-2004
  • 1975-1979  (2)
  • 2002
  • 1976  (2)
  • 1
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    A boundary-layer model of flow in a porous medium at high Rayleigh number (1976)
    Cambridge University Press
    Details
    Publication Date: 1976-06-01
    Description: A boundary-layer model, based on computational results, describes a number of features of two-dimensional convection in a porous medium: the heat flux, velocity, length and temperature scales and the pattern of flow. The cell structure is different from that for convection in a viscous fluid. The model is valid for a limited range of the Rayleigh number. © 1976, Cambridge University Press. All rights reserved.
    Print ISSN: 0022-1120
    Electronic ISSN: 1469-7645
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Cambridge University Press
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  • 2
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    The effect of a reduction in food intake during late pregnancy on nitrogen metabolism in ewes (1976)
    Cambridge University Press
    Details
    Publication Date: 1976-02-01
    Description: SUMMARYTwelve Finnish Landrace × Dorset Horn ewes with a mean litter size of 1·92 and a mean body weight of 75±3 kg were individually penned from 80 days of gestation to parturition and offered a diet with a metabolizable energy (ME) and crude protein content in the dry matter of 9·7 MJ/kg and 11·4% respectively. At 120 days of gestation daily ME intake was abruptly reduced from a mean of 0·48 to 0·25 MJ/kg W0·75 for a period of 10 days.The observed increase in the plasma concentration of urea due to the reduction in food intake was better correlated with lamb birth weight (r = 0·87) than was the increase in plasma free fatty acid concentration (r = 0·53) or the decrease in plasma glucose concentration (r = 0·76). Mean daily nitrogen balance decreased from a mean of 5·6 g before food restriction to – 1·8 g after food restriction. Although the effect was not significant, single bearing ewes excreted more total and urea nitrogen in the urine than multiple bearing ewes before food restriction. During food restriction the trend was reversed. The change in urea nitrogen excretion (Y, g/day) that resulted from the reduction in food intake was correlated (r = 0·73, P 〈 0·01) with lamb birth weight (X, kg); the relationship was Y = 0·54(±0·16)X – 3·48. It was estimated that the daily loss of nitrogen from the maternal body during the period of food restriction was approximately 80% of published values for the urinary nitrogen excretion of fasting non-pregnant sheep.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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