Oviposition pattern of Japanese quail following hypothalamic lesioning with super-absorbent polymer.
The functions of two hypothalamic areas in controlling the female reproductive cycle were investigated by the intracerebral injection of a new type of water-absorbent polymer of high capacity (super-absorbent polymer). After injection of a minute amount of the polymer into the brain tissue, bulging of the polymer produces a discrete lesion at the site of injection. Two lines (T- and J-lines) of Japanese quail were used; T-line, having a characteristic free-running oviposition pattern irrespective of the environmental 14L10D, and J-line, having a regular oviposition pattern which synchronized with 14L10D. Lesions at the preoptic area were without effect in birds of J-line, but the oviposition of T-line was changed from free-running to regular. Lesions at the posterodorsal part of the infundibular complex were without effect in T-line, but the regular oviposition pattern of J-line became free-running. These results suggest that relative dominancy between the two hypothalamic areas may determine basic pattern of oviposition through modification of the ovulation cycle.
Ohta
M
M
Department of Veterinary Physiology, College of Agriculture, University of Osaka Prefecture, Japan.
Homma
K
K
D000818:Animals; D003370:Coturnix / Q000502:physiology*; D003624:Darkness; D005260:Female; D007031:Hypothalamus / Q000033:anatomy & histology / Q000502:physiology* / Q000528:radiation effects; D008027:Light; D010058:Oviposition / Q000187:drug effects* / Q000528:radiation effects; D010060:Ovulation; D010786:Photoreceptor Cells / Q000502:physiology; D011108:Polymers / Q000008:administration & dosage*; D011784:Quail / Q000502:physiology*
D011108:Polymers