... was to determine whether decreased luteinizing hormone (LH) secretion during incubation in the domestic hen is associated with a decrease in hypothalamic chicken gonadotropin-releasing hormone-I (cGnRH-I) mRNA or peptide. A semiquantitative competitive PCR assay was developed to measure cGnRH-I mRNA. Hypothalamic...

...Vincent M. Cassone; Ross F. Lane; Michael Menaker Day-night differences in the concentrations of melatonin and serotonin (5HT) were measured in several regions of the chicken brain, pineal gland and serum. Melatonin concentrations are higher at midnight than at midday in 8 of the 10 tissues studied...

...C.G. Scanes Chicken anterior pituitary glands were incubated in vitro with different doses of synthetic thyrotrophin releasing factor (TRF). The release of both thyroid stimulating hormone (TSH) and luteinizing hormone (LH) was then monitored. Relatively low doses of TRF (2 and 4 ng/ml...

...K. Shimada; J. Yano; S. Oshima; T. Tonoue The electroencephalogram (EEG) of the chicken hypothalamus was recorded under the influence of repetitive photic stimulation, while thyroid activity was assessed by determining blood protein bound 131 I levels in sequential samples. EEG waves in regions...

... of the White Leghorn hypothalamus was found to be 3–16 µ g/g wet weight of tissue, the amount depending largely upon circulating gonadotrophin levels. The hypothalamic catecholaminergic system is probably involved in regulation of releasing factors in the chicken. The ‘short-feedback’ mechanism does...