A Physiological Study of Egg Shell Formation in the Domestic Fowl with Special Reference to the Initiation of Secreting Egg Shell Material

耕作, 田中; Tanaka, Kousaku

doi:10.2508/chikusan.47.385

Cited by 6 publications

(3 citation statements)

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“…Just before the expected oviposition of the terminal egg (Ct) of a clutch, the vagina was loosely ligated through an incision made in the left abdominal wall. A thread placed around the vagina was removed 3 h after ligation (Tanaka, 1976a). By this treatment the Ct was generally held in the uterus and expelled the following morning in association with Cl ovulation.…”

Section: Methodsmentioning

confidence: 99%

Changes in the plasma concentration of immunoreactive arginine vasotocin during oviposition in the domestic fowl

Tanaka¹,

Goto²,

Yoshioka³

et al. 1984

British Poultry Science

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The plasma concentrations of immunoreactive arginine vasotocin (AVT) were measured during oviposition and shortly before ovulation of the first egg (Cl) of a clutch. Immunoreactive AVT was determined on bentonite extracts of 0.5 ml plasma samples using the method of Rosenbloom and Fisher (1974). The R-70 antiserum used to measure AVT cross reacted with arginine vasopressin (AVP), however the fowl pituitary does not synthesise AVP. Over a period of 10 to 90 min before oviposition the plasma AVT concentration was about 20 pg/ml; during oviposition it increased four-fold. Measurements made at frequent intervals showed that plasma AVT concentration increased 5 to 6 min before oviposition, reached a peak during oviposition itself and decreased rapidly in the following 5 to 6 min. The surge in plasma AVT occurred on average 48 min before Cl ovulation.

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Section: Methodsmentioning

confidence: 99%

Changes in the plasma concentration of immunoreactive arginine vasotocin during oviposition in the domestic fowl

Tanaka¹,

Goto²,

Yoshioka³

et al. 1984

British Poultry Science

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“…This hypothesis was supported in experiment 2, where the proportion of hens laying < 2 h after stress ended was significantly greater when the oviposition delay was currently < 2·4 h, compared with > 2·4 h. Furthermore, hens did not lay during stress when the oviposition delay exceeded 3 h, in either experiment. Consistent with this hypothesis is the finding that ovipositions delayed surgically by tying a thread around the utero-vaginal sphincter, to obstruct passage of the egg, do not occur until much later when the thread is removed 3 h after expected oviposition time (Tanaka, 1976;Tanaka et al, 1984). The critical duration of oviposition delay beyond which an egg cannot be laid until much later varied considerably among hens in both experiment 1 (2·4 to 3·6 h) and experiment 2 (1·5 to 4·3 h).…”

Section: Discussionmentioning

confidence: 70%

Stress-induced oviposition delays in laying hens: Duration and consequences for eggshell quality

Reynard¹,

Savory²

1999

British Poultry Science

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1. As part of a programme investigating the causation of pecking damage in fowls, this experiment tested a proposal that birds may receive more feather pecks when their plumage colour contrasts with floor litter colour, because litter particles on plumage (as a consequence of dustbathing) may then have greater stimulus value. 2. Groups consisting of 7 light- and 7 dark-coloured bantams were reared from 1 to 11 weeks of age in pens with either wood shavings (light coloured, n=6) or peat (dark coloured, n=6) floor litter. 3. Feather loss from pecking commenced in the 3rd week of life and increased thereafter, but observed pecking damage scores were not consistent with the hypothesis being tested. 4. Despite many more pecks at birds being seen (over 10 weeks) in the wood shavings groups' (661 at particles on plumage, 1795 not at particles) than in peat groups (205, 787), there was no effect of litter substrate on pecking damage. The only evidence supporting the proposal was the finding that, in groups on wood shavings, significantly more pecks at particles on plumage were directed from light coloured birds towards dark ones, than from light to light, dark to light, or dark to dark. 5. Feather eating was confirmed from the presence of feather material in 2% to 15% of faecal droppings collected from each group at 11 weeks, but these proportions were not correlated with pecking damage scores. 6. The results imply that only some feather pecks/pulls were damaging and only some eaten feathers were pulled from other birds.

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“…With regard to the whole avian oviduct, estrogen is mainly responsible for growth and differentiation, whereas progesterone, as a secretory hormone, stimulated the secretion of albumen in the magnum region of the oviduct (Gilbert 1971). Progesterone has also been found to increase the shell thickness and the duration of shell formation (Tanaka 1976;Nys 1987). Testosterone in combination with estrogen has been reported to stimulate the formation of medullary bone, an essential source of calcium which is mobilized during shell formation (Simkiss and Taylor 1971).…”

Section: Introductionmentioning

confidence: 99%

Influence of chlorinated hydrocarbons, Hg2+ and methyl-Hg+ on steroid hormone receptors from eggshell gland mucosa of domestic fowls and ducks

Lundholm

1991

Arch Toxicol

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A series of chlorinated hydrocarbons were investigated for their ability to inhibit the binding of tritiated progesterone, dexamethasone and testosterone to their respective cytoplasmic receptors, prepared from the eggshell gland mucosa of the domestic fowl. o,p'-DDE and toxaphene were most potent in inhibiting the binding of progesterone and testosterone to their receptors, while p,p'-DDE was most potent in inhibiting the binding of dexamethasone. The effect of the latter compound on dexamethasone binding was biphasic. There were significant differences between ducks and domestic fowls in the dissociation constant (KD) and maximal number of binding sites (Bmax) for several of the steroid hormones. No effect of steroid binding was observed in the p,p'-DDE-treated ducks that were laying thin-shelled eggs. Some metals were also tested for their ability to inhibit progesterone binding. Hg2+ was most potent (IC50 = 5.8 x 10(-5) M) in this respect, while Cd2+, Pb2+ and Al3+ inhibited the binding only when administered in very high concentrations (10(-3) M). Me-Hg+ was less potent than Hg2+. It is concluded that chlorinated hydrocarbon pesticides may interact with several different steroid hormone receptors. These findings are discussed in relation to some reproductive and other hormonal disturbances observed in birds and mammals.

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A Physiological Study of Egg Shell Formation in the Domestic Fowl with Special Reference to the Initiation of Secreting Egg Shell Material

Abstract: The insertion of an artificial yolk (A. Y.) into the oviduct and the prevention of oviposition by a surgical means or by injection of progesterone were performed to investigate the initiation of secreting egg shell material in the uterus .

Cited by 6 publications

References 0 publications

Changes in the plasma concentration of immunoreactive arginine vasotocin during oviposition in the domestic fowl

Changes in the plasma concentration of immunoreactive arginine vasotocin during oviposition in the domestic fowl

Stress-induced oviposition delays in laying hens: Duration and consequences for eggshell quality

Influence of chlorinated hydrocarbons, Hg2+ and methyl-Hg+ on steroid hormone receptors from eggshell gland mucosa of domestic fowls and ducks

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