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  • Key wordsGallus gallus domesticus  (1)
  • Seasonality  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Components of biological, including seasonal, variation in hematological measurements and plasma fibrinogen concentrations in normal humans (1995)
    Springer
    Cellular and molecular life sciences 51 (1995), S. 141-149 
    Details
    ISSN: 1420-9071
    Keywords: Seasonality ; annual rhythms ; hematology ; red blood cells ; platelets ; fibrinogen ; biological variation ; coefficient of variation ; index of individuality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract This study has been carried out in order to examine the components of biologicalaand, in particular, seasonal variation in hematologic measurements in normal humans. Toward this end, 26 normal volunteers had monthly blood samplings during one calendar year for determination of number of red blood cells (RBC) and platelets, hemoglobin (Hb), hematocrit (Ht), mean corpuscular volume (MCV), MC Hb (MCH), MC Hb concentration (MCHC), RBC distribution width (RDW), mean platelet volume (MPV), platelet distribution width (PDW), plateletcrit (PCT), and plasma fibrinogen concentrations. The data were analyzed by means of spectral analyses of a group of time series or a single time series, and by means of repeated measures analyses of variance. Most of the hematologic variables show seasonal rhythms, such as annual rhythms or harmonics, which are expressed as a group phenomenon. An important part of the variance (〉15%) in Ht, MCV, MCH, MCHC, RDW, number of platelets, MPV and plasma fibrinogen was explained by a yearly variation. The peak-trough differences (expressed as a percentage of the mean) in the yearly variations in number of RBC, Ht, MCV, MCH, MCHC and RDW were very low (all〈8.5%). Number of platelets (14.4%) and plasma fibrinogen values (28%) showed a high-amplitude yearly variation. All hematological variables, except MCHC, show a high interindividual variability which exceeds by far the intraindividual variability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01929358
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Internal and external factors modulate food-calling in domestic hens (1999)
    Springer
    Animal cognition 2 (1999), S. 1-10 
    Details
    ISSN: 1435-9456
    Keywords: Key wordsGallus gallus domesticus ; Food call ; Food ; preference ; Psychophysiological state ; Cognitive ; abilities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two series of experiments investigated factors affecting utterance of food calls in the domestic hen, Gallus domesticus. The first series of experiments tested the effect of food preference and the hen’s internal state on the utterance of food calls. Different food types were presented first singly and then in a choice test to 20 hens, first when hens were laying, and then when they were maternal. The second series of experiments tested the effect of hunger level on the utterance of food calls in laying hens, and maternal hens with or without chicks. These two series of experiments showed that laying hens and maternal hens showed a similar marked preference for certain types of food, but laying hens very rarely emitted food calls, in contrast to maternal hens. This shows the effect of the bird’s psychophysiological state on her tendency to emit food calls. The more a maternal hen preferred a food type, the more food calls she emitted. This was observed from the beginning of a test in single-food tests as well as in choice tests. Hunger level positively affected food-call production under certain feeding conditions in maternal hens, but not in laying hens. When maternal hens were tested in the absence of their chicks, utterance of food calls was more sustained than in the presence of chicks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100710050019
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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