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Annual Periodicity of Total Blood Thyroxine (T4) in Male Fallow Deer: Problems and Experiences

  • Klaus Fischer
Conference paper

Abstract

The annual T4 profile in adult fallow (Dama dama) bucks plateaus between January and August (x-̄ ≈ 50 ng/ml). T4 has minimal values during the rut (October: x-̄=28.3 ng/ml; November: 30.4 ng/ml) with differences of 44% (P≦ 0.001). There were no differences between serum and plasma samples (P 0.001; r>0.9). Annual profiles with two commercial kits show r = 0.98, but differences of 33.1% to 34.6% (P 0.001). T4 measurement was repeated later with the same blood samples and the same coded test kit. Results showed r = 0.94, but values differed at 10.14 ng/ml (P 0.001). Other values were also lower in this test. One yearling fell sick and 4 weeks before death T4 = 14.9 ng/ml. Another buck had a severe parasitic infection, but in conjunction with a social environment change, T4 almost normalized after 1 year. T4 measurements were made in animals that had lived together more than 1 year before sampling. R over 1.5 years were: 0.89, 0.79, and 0.85 between half-brothers, and 0.73, 0.79, and 0.86 between adult bucks. Annual T4 curves of other bucks from other groups had faint positive correlations with the two groups mentioned, but all individuals demonstrated a strong T4 depression around rut. The annual T4 pattern in a fawn/yearling living in a small enclosure with several old animals showed extremely high T4 due to the social stress. There was no difference in T4 between fawns/yearlings and adults, but in fawns/yearlings T4 oscillated.

Keywords

Blood Sample Environment Change Plasma Sample Nature Conservation Social Environment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer-Verlag New York, Inc. 1992

Authors and Affiliations

  • Klaus Fischer
    • 1
  1. 1.Zoological InstituteGottingen UniversityGottingenGermany

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