June 2014 (No. 2)
Lynx reproduction – Long-lasting life cycle of corpora lutea in a feline species×
Katarina Jewgenow*, Johanna Painer, Olga Amelkina, Martin Dehnhard, Frank Goeritz
Leibniz-Institute for Zoo Biology and Wildlife Research, PF 700430, D-10324 Berlin, Germany
A review of lynxes’ reproductive biology and comparison between the reproductive cycles of the domestic cat and lynxes is presented. Three of the four lynx species (the bobcat excluded) express quite similar reproductive pattern (age at sexual maturity, estrus and pregnancy length, litter size). Similarly to the domestic cat, the bobcat is polyestric and can have more than one litter per year. Domestic cats and many other felid species are known to express anovulatory, pregnant and pseudo-pregnant reproductive cycles in dependence on ovulation induction and fertilization. The formation of corpora lutea (CLs) occurs after ovulation. In pregnant animals, luteal function ends with parturition, whereas during pseudo-pregnancy a shorter life span and lower hormone secretion are observed. The life cycle of corpora lutea in Eurasian lynxes is different from the pattern described in domestic cats. Lynx CLs produce progestagens in distinctive amounts permanently for at least two years, regardless of their origin (pregnancy or pseudo-pregnancy). It is suggested that longlasting CLs induce a negative feedback to inactivate folliculogenesis, turning a normally polyestric cycle observed in most felids into a monoestric cycle in lynxes.
Reproductive Biology 2014 14 2: 83-88.
× The material described in this review article was presented as an invited lecture at Ludwig Fraenkel Symposium „Endocrine Control of Corpus Luteum Function” in Wrocław, Poland (5–6 September, 2013).
* Corresponding author: E-mail address: email@example.com (K. Jewgenow).