Effect of calcitonin on the domestic fowl

1969 ◽  
Vol 47 (3) ◽  
pp. 313-315 ◽  
Author(s):  
Leon Kraintz ◽  
K. Intscher
Keyword(s):  
Calcium Homeostasis ◽  
Intravenous Infusion ◽  
Domestic Fowl ◽  
Plasma Calcium ◽  
Gallus Domesticus ◽  
Thyroid Extract ◽  
Calcium Response ◽  
Dose Levels ◽  
Hypocalcemic Activity ◽  
Ultimobranchial Gland

The plasma calcium response of intact and acute partially parathyroidectomized cockerels (Gallus domesticus) to the intravenous infusion of porcine thyroid calcitonin, avian ultimobranchial calcitonin, and chicken thyroid extract was determined. No hypocalcemic response was obtained in the intact cockerels with any of the agents tested. However, marked hypocalcemic responses were obtained in the partially parathyroidectomized cockerels following administration of porcine thyroid calcitonin or avian ultimobranchial calcitonin at the same dose levels (300 MRC milliunits/kg). No hypocalcemic activity was obtained with chicken thyroid extract. It is possible to speculate, from these results, that calcitonin from the ultimobranchial gland is involved in the maintenance of plasma calcium homeostasis in the chicken.

Changes in 3β-hydroxy-Δ5-steroid dehydrogenase activity in granulosa tissue during the ovulatory cycle of the laying hen (Gallus domesticus)

1985 ◽  
Vol 106 (3) ◽  
pp. 269-273 ◽  
Author(s):  
D. G. Armstrong
Keyword(s):  
Enzyme Activity ◽  
Dehydrogenase Activity ◽  
Domestic Fowl ◽  
Ovarian Follicle ◽  
Laying Hen ◽  
Gallus Domesticus ◽  
Ovulatory Cycle ◽  
Lh Surge ◽  
Maximal Plasma ◽  
Steroid Dehydrogenase

ABSTRACT The object of this study was to examine changes in the activity of granulosa 3β-hydroxy-Δ5-steroid dehydrogenase during the ovulatory cycle of the domestic fowl. The enzyme activity in granulosa tissue from the largest follicle increased significantly during the period 8–14 h before an expected ovulation. The increase in activity occurs before the preovulatory surge of LH and near the time of lights off. During the 4–8 h period before an ovulation, i.e. the time of maximal plasma LH concentrations, 3β-hydroxy-Δ5-steroid dehydrogenase activity decreased in granulosa tissue from the largest follicle. This observation is explained by proposing that the enzyme is inhibited by the large amounts of progesterone found in the tissue at this time. The results indicate that important biochemical changes are taking place within granulosa tissue of the largest ovarian follicle before the preovulatory LH surge. J. Endocr. (1985) 106, 269–273

Nucleotide sequences and unusual electrophoretic behavior of the W chromosome-specific repeating DNA units of the domestic fowl, Gallus gallus domesticus

Chromosoma ◽  
1987 ◽  
Vol 96 (1) ◽  
pp. 18-25 ◽  
Author(s):  
Hiroshi Kodama ◽  
Hisato Saitoh ◽  
Masahide Tone ◽  
Satoru Kuhara ◽  
Yoshiyuki Sakaki ◽  
...  
Keyword(s):  
Domestic Fowl ◽  
Gallus Gallus ◽  
Nucleotide Sequences ◽  
Gallus Domesticus ◽  
Gallus Gallus Domesticus ◽  
W Chromosome ◽  
Electrophoretic Behavior
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