[Effect of monoamines and testosterone on hypothalamo-gonadal complex of Japanese quail (an electrophysiological and morphometric study)]. / Vplyv monoaminiv i testosteronu na hipotalamo-honadnyi kompleks iapons'kykh perepeliv (elektrofiziolohichne ta morfometrychne doslidzhennia).

Effects of biogenic amines, testosterone and melatonin both on the developing electrical activity of hypothalamic arcuate nucleus (NA) and morphology of testis and NA neurocytes during maturation in birds (Coturnix coturnix japonica) were tested. Slow [symbol: see text]-frequency was shown to prevail at quail NA electrical activity. NA spectral power gradually enlarges during maturation. The data confirm the evidence that catecholamines induce acceleration of sexual maturation in birds mainly via brain alpha-adrenoreceptors, while dopamine- and serotoninergic brain systems cause deceleration of maturation. Morning or evening treatments with melatonin (5 mkg/100 g bw) and evening ones (50 mkg/100 g bw) were revealed to result in activation of hypothalamic-testicular axis, and high-dose morning melatonin injections don't have any influence. Significant correlation was registered between the spectral power of NA neurocytes and profile area of their cellular nuclei. Total EA was demonstrated to vary at [symbol: see text]1- and, lesser, [symbol: see text]2-, [symbol: see text]-, and 6-ranges of spectrum, and was insignificant at B-range.

[The electrical activity of the hypothalamic arcuate nucleus and the morphofunctional characteristics of the gonads in birds during blockade and stimulation of the beta-adrenergic receptors]. / Elektrichna aktyvnist' arkuatnoho iadra hipotalamusa ta morfofunktsional'na kharakterystyka honad ptakhiv pry blokadi ta stymuliatsiï beta-adrenerhichnykh retseptoriv.

Beta-adrenoreceptors agonist isadrine as shown by measurement of hypothalamic arcuate nucleus (AN) summary electrical activity and by morphometry of its neurons and testis does not result in significant acceleration of maturation in maturing (4-6 week old) male japanese quails (Coturnix coturnix japonica). Anapryline-induced blockade of beta-adrenoreceptors leads to small inhibiting of the reproductive complex. This findings confirm our previous works, according to which brain beta-adrenergic system does not play leading role in regulation of maturation in birds. The direct correlation between morphometrical and electrophysiological features of AN neurosecretory cells was demonstrated as well.