Osteoclast cell-surface specializations and nuclear kinetics during egg-laying in Japanese quail

1981 ◽  
Vol 162 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Scott C. Miller
Keyword(s):  
Cell Surface ◽  
Japanese Quail ◽  
Egg Laying

scholarly journals Osteoclast cell-surface changes during the egg-laying cycle in Japanese quail

1977 ◽  
Vol 75 (1) ◽  
pp. 104-118 ◽  
Author(s):  
SC Miller
Keyword(s):  
Cell Surface ◽  
Japanese Quail ◽  
Bone Cells ◽  
Egg Laying ◽  
Medullary Bone ◽  
Cell Processes ◽  
Cyclic Variations ◽  
Egg Shell ◽  
Cell Surface Changes ◽  
Cyclic Changes

The medullary bone serves as a source of labile calcium mobilized during calcification of the egg shell in birds. Quantitative histological methods demonstrate that the numbers of medullary bone osteoclasts and nuclei per osteoclast remain unchanged during the egg cycle in the Japanese quail (Coturnix). Therefore, cyclic changes in bone resorption cannot be explained by modulations of osteoclasts from and into other bone cells, a mechanism previously suggested for certain species of birds. Rather, dramatic changes in osteoclast cell-surface features occur during the egg cycle, which might account for cyclic variations in resorptive activity. During egg shell calcification, osteoclasts with ruffled borders are closely apposed to bone surfaces; the cytoplasm is rich in vacuoles that contain mineral crystals and seem to derive from the ruffled border. At the completion of egg shell calcification, the ruffled borders and vacuoles move away from the bone surface, although the osteoclast remains attached to the bone along the filamentous or "clear" zone. Associated with the disappearance of the ruffled borders is the appearance of extensive interdigitated cell processes along the peripheral surface of the osteoclast away from the bone. These unusual structures, which may serve as a reservoir of membrane, largely disappear when ruffled borders and associated structures reappear. Therefore, in these hens, the osteoclasts modulate their cell surface rather than their population during the egg cycle.

scholarly journals Search for QTL affecting the shape of the egg laying curve of the Japanese quail

BMC Genetics ◽  
2006 ◽  
Vol 7 (1) ◽  
Author(s):  
Francis Minvielle ◽  
Boniface B Kayang ◽  
Miho Inoue-Murayama ◽  
Mitsuru Miwa ◽  
Alain Vignal ◽  
...  
Keyword(s):  
Japanese Quail ◽  
Egg Laying

scholarly journals Anatomical and histological changes in the oviducts of Japanese quail, Coturnix japonica, after embryonic exposure to ethynyloestradiol

Reproduction ◽  
2001 ◽  
pp. 155-165 ◽  
Author(s):  
C Berg ◽  
L Holm ◽  
I Brandt ◽  
B Brunstrom
Keyword(s):  
Japanese Quail ◽  
Egg Laying ◽  
Coturnix Japonica ◽  
In Ovo ◽  
Histological Changes ◽  
Bird Populations ◽  
Embryonic Exposure ◽  
Exogenous Oestrogen ◽  
Tubular Gland ◽  
Sexually Mature

Oestrogen is needed for normal oviductal development in female birds, but excessive early exposure to oestrogen can cause oviductal abnormalities and impair egg-laying ability. In this study, the anatomical and histological effects of in ovo exposure to the synthetic oestrogen ethynyloestradiol on the oviducts of immature and adult female Japanese quail, Coturnix japonica, were investigated. A series of abnormalities was observed after injection of ethynyloestradiol (2 or 20 ng g(-1) egg) into the yolk on day 3 of incubation. Ethynyloestradiol induced precocious differentiation of the luminal epithelium and tubular glands in immature chicks. Right-side oviduct retention occurred at all the ages studied, whereas certain other effects were not evident until sexual maturity. The left oviduct was reduced in size and tubular gland density in the uterus (shell gland) was reduced in sexually mature birds that had been treated with ethynyloestradiol. The utero-vaginal junction was longer than in control birds and had a higher tubular gland density. The epithelial cells in the magnum were taller in birds treated with ethynyloestradiol. Embryonic exposure to the environmental contaminant ethynyloestradiol may cause persisting structural malformations in oviducts of quails, which can impair fertility. As oviductal malformations are indicative of embryonic exposure to exogenous oestrogen, they are potentially useful as biomarkers of xenooestrogen exposure in wild bird populations.

scholarly journals Lipid sources in diets for egg-laying japanese quail: performance and egg quality

2016 ◽  
Vol 38 (3) ◽  
pp. 281 ◽  
Author(s):  
Letícia Abaker Bertipaglia ◽  
Márcia Izumi Sakamoto ◽  
Liandra Maria Abaker Bertipaglia ◽  
Gabriel Maurício Peruca de Melo
Keyword(s):  
Japanese Quail ◽  
Alternative Energy ◽  
Egg Quality ◽  
Grape Seed ◽  
Egg Laying ◽  
Production Performance ◽  
Animal Origin ◽  
Total Period ◽  
Randomized Design ◽  
Grape Seed Oil

This study evaluated the effect of using lipid sources of plant and animal origin in diets for Japanese quail (Coturnix coturnix japonica) on production performance and internal egg quality. Japanese quails (n = 160) were distributed in a completely randomized design with four treatments and eight replications of five birds each. Lipid sources evaluated were: soybean oil, from poultry slaughterhouse, fish waste and grape seed. The characteristics of performance and internal egg quality were measured every 21 days for a total period of 84 days. Data were subjected to analysis of variance and the means were compared by Tukey’s test. There was no effect of treatments on the production performance of birds, except for feed intake, which was higher for birds fed grape seed oil in the diet. Lipid sources evaluated had no influence on the internal egg quality. It can be concluded that the lipid sources evaluated here in can be used as alternative energy in feed for laying quails, without affecting the performance and internal egg quality. 

Vitamin D metabolism: physiological regulation in egg-laying Japanese quail

1976 ◽  
Vol 230 (6) ◽  
pp. 1609-1615 ◽  
Author(s):  
AD Kenny
Keyword(s):  
Japanese Quail ◽  
Vitamin D3 ◽  
Physiological State ◽  
Reproductive Period ◽  
Egg Laying ◽  
Ovulatory Cycle ◽  
Vitamin D Metabolism ◽  
Dihydroxyvitamin D3 ◽  
Enhanced Production ◽  
Egg Shell

Homogenates of kidney removed from reproductivity active female Japanese quail were incubated with tritiated 25-hydroxyvitamin D3, and the metabolites were extracted and identified by chromatographic methods. Kidneys removed from birds with and without an egg in the oviduct revealed that ovulation results in enhanced production of 1, 25-dihydroxyvitamin D3, the active hormonal form of vitamin D3. Further examination of this phenomenon in relation to the ovulatory cycle revealed that 1, 25-dihydroxy-vitamin D3 production is enhanced throughout the 24 h following ovulation. Particularly important is the finding that its synthesis is already enhanced during the first 6 h after ovulation, at a time before any calcification of the egg shell begins. If, following oviposition, no ovulation occurs, 1, 25-dihydroxy-vitamin D3 production decreases rapidly and significantly within the first 6 h following oviposition. This study has revealed for the first time a physiological state, namely the reproductive period in the female bird, in which endogenous control over 1, 25-dihydroxyvitamin D3 production is exhibited without any previous manipulation, dietary or otherwise, of the animals.

scholarly journals Seasonal changes in plasma retinol-binding holoprotein concentration in japanese quail (Conturnix coturnix japonica)

1980 ◽  
Vol 43 (2) ◽  
pp. 357-366 ◽  
Author(s):  
J. Glover ◽  
D. J. Heaf ◽  
Suzanne Large
Keyword(s):  
Vitamin A ◽  
Japanese Quail ◽  
Seasonal Changes ◽  
Late Summer ◽  
Hormonal Control ◽  
Egg Laying ◽  
Coturnix Japonica ◽  
Mean Values ◽  
Natural Lighting ◽  
Plasma Retinol

1. Seasonal changes in retinol-binding holoprotein (holoRBP) concentration in plasma of group of male and female Japanese quail (Coturnix coturnix japonica) were examined over 18 months.2. In Expts 1 and 2 the birds were maintained under natural lighting conditions and in Expt 3 under artificial-light photoperiods corresponding to the changing daylength at 56° N latitude. All groups were at 18–20° and received Superlayers' (Rank Hovis McDougall) pellet diet.3. The mean plasma holoRBP concentration in all groups changed in an annual cycle with minimal values in September–October and maximal values in February–April, when daylength or light photoperiod increased to more than 10 h.4. The group mean values in the female cycle change 2- to 3-fold from 50–100 μg/ml in late summer to 220–280 μg/ml in the spring, whereas in the male the range is only 1.3–1.5 times, from 140–170 to 180–250 μg/ml.5. In the female the rate of egg laying was maximal in April–May and lowest in November–December.6. The spring increase in plasma holoRBP reflects the increased vitamin A requirement of birds for reproduction and it is presumably under hormonal control. The wider amplitude in the female cycle compared with the male probably arises from the additional demand for the transfer of vitamin A into the eggs and hence the need for a higher initial secretion rate from the female liver to meet it.

Sign in / Sign up

Export Citation Format

Share Document