PMID: 6884749Jun 1, 1983

The presence of vasotocin and mesotocin in serum and the hypothalamo-neurohypophyseal axis of chick embryos before hatching and in posthatch chicks

General and Comparative Endocrinology
E J NouwenE R Kühn


Decreasing hematocrit values were observed in chick embryos, from Day 17 to 1 day posthatching. Arginine vasotocin (AVT) and mesotocin (MT) were determined radioimmunologically in serum, neural lobe, and hypothalamic tissue. Serum levels of AVT and MT were significantly increased on Day 18 of incubation compared to Day 17. Thereafter AVT levels decreased, reaching at hatching levels even below Day 17. Serum MT remained elevated on Day 19, but decreased thereafter to the concentration values of Day 17. The amount of AVT in the preoptic hypothalamus and infundibulum was maximal on Day 19, whereas in the neural lobe the maximum was attained on Day 20. The MT content of the infundibulum and neural lobe reached a maximum plateau on Day 18. These results suggest that a stimulation of the hypothalamo-neurohypophyseal axis in the chick embryo occurs at the end of incubation. A possible causal relation with the observed decreasing hematocrit values is discussed.


Jan 1, 1979·Biology of the Neonate·R I StarkR L Vande Wiele
Jan 1, 1978·Pediatric Research·R E WeitzmanF Smith
Nov 6, 1975·Nature·M S MankuD F Horrobin
Jan 1, 1972·The Journal of Clinical Investigation·E L GreshamF C Battaglia
Jul 1, 1966·The Journal of Endocrinology·P D Sturkie, Y C Lin
May 1, 1983·General and Comparative Endocrinology·E J Nouwen, E R Kühn
Apr 1, 1980·Clinical Endocrinology·L ReesC G Brook

Related Concepts

Chick Embryo
Organum Vasculosum Laminae Terminalis
Infundibular Stem

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