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      Influence of the Season on Plasma Prolactin Level in Cattle from Birth to Maturity


      Hormone Research in Paediatrics

      S. Karger AG

      Seasonal parameters, Radioimmunoassay, Prolactin, Cattle

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          Results are described giving prolactin plasma concentrations, as determined by radioimmunoassay, in 5 non-lactating female and 4 male calves from a few days after birth to an age of 20 or 24 months. The blood samples were always collected at the same time of day (8–9 a.m.). Prolactin concentrations were shown to be dependent on the season, higher values being found in the summer, lower values in the winter. A significant correlation (r = 0.9; p < 0.001) was found between prolactin levels and the number of daylight hours and temperature.

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          Author and article information

          Horm Res Paediatr
          Hormone Research in Paediatrics
          S. Karger AG
          21 November 2008
          : 5
          : 4
          : 217-226
          Institute of Physiology, Süddeutsche Versuchs- und Forschungsanstalt für Milchwirtschaft Weihenstephan der Technischen Universität München, Weihenstephan
          178634 Horm Res 1974;5:217–226
          © 1974 S. Karger AG, Basel

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          Pages: 10


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