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  • Articles: DFG German National Licenses  (2)
  • 1975-1979  (2)
Source
  • Articles: DFG German National Licenses  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The efficiency of operant thermoregulatory behaviour in pigs as determined from the rate of oxygen consumption (1975)
    Springer
    Pflügers Archiv 353 (1975), S. 139-149 
    Details
    ISSN: 1432-2013
    Keywords: Pig ; Thermoregulation ; Metabolism ; Behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Pigs were trained to perform an operant response for a reinforcement of radiant heat and comparisons were made between oxygen consumption during sessions when extra heat was available and others when it was not. It was found that as judged by the rate of oxygen consumption the efficiency with which heat was obtained was very high when the radiation was allowed to increase air temperature, but declined when air temperature remained low. If the pig had to make several responses for a single reinforcement, there was no saving in oxygen consumption. Reducing the intensity of the heating led to a reduction in the frequency at which responses were made. When the reinforcement was a brief respite from a draught, the pigs performed a greater number of responses at low ambient temperatures, but this was not accompanied by any saving in the rate of oxygen consumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00599874
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adaptations to ambient temperature in growing pigs (1977)
    Springer
    Pflügers Archiv 367 (1977), S. 257-264 
    Details
    ISSN: 1432-2013
    Keywords: Acclimatization ; Temperature ; Metabolism ; Peripheral blood flow ; Pigs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Pigs were weaned at 8–10 days of age and littermate pairs were raised in individual cages at ambient temperatures of 25°C or 35°C to 8 weeks of age. 2. Pigs reared at the higher temperature had longer extremities and less hair than controls even though body weights were similar. 3. On exposure to an ambient temperature of 45°C, the animals reared in the cooler environment increased rectal temperature twice as quickly as their littermates. 4. When the scrotum was heated locally to 42°C animals reared in the warmer environment began to pant at a lower ambient temperature than the controls. 5. Heating the hypothalamus by means of an implanted thermode at an ambient temperature of 35°C was accompanied by an increase in respiratory frequency in pigs reared at 25°C. The pigs reared at 35°C already had a slightly elevated rate of breathing and heating the hypothalamus caused no change. 6. The rate of blood flow in the tail was higher in pigs reared at 25°C than those kept at 35°C when measured at ambient temperatures between 20°C and 35°C. When the hypothalamus was cooled the slope of the line relating blood flow to the temperature of the thermode was similar in both groups. 7. The critical temperature as determined from measurements of oxygen consumption was higher in the pigs reared at 35°C than in controls. But the effect of cooling the hypothalamus on metabolism was similar in both groups. 8. There was no difference between the two groups in the rate of cutaneous water loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581363
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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