About this Environmental Science article
Annual Cycle of Plasma Luteinizing Hormone Concentrations in Wild Mallard Drakes by E. Haase; P. J. Sharp; E. Paulke is a Environmental Science article available to read on EtoBox.
## Abstract Plasma LH concentrations were followed in 9 individually marked wild mallard drakes in Kiel (54°N) for one year at monthly intervals. Mean LH levels increased during the spring and reached the annual maximum in April and May. In June when testicular regression occurs, the LH titer sharply decreased and was lower than at any other phase of the annual cycle. In late fall mean plasma LH concentrations increased and, whilst not reaching the values observed during the breeding season, remained relatively high during the winter. Thus, in the mallard LH can be released under short and long daily photo‐periods.
It is typically read by researchers, students, and practitioners in Environmental Science.
- Author
- E. Haase; P. J. Sharp; E. Paulke
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0022-104X)
- Published
- 1975
- Language
- EN
- Field
- Environmental Science (Life Sciences)