scholarly journals Influence of Ovulation and Gonadal Hormones on Shell Formation in the Domestic Fowl

1976 ◽  
Vol 13 (5) ◽  
pp. 169-175 ◽  
Author(s):  
Tadashi NAKADA ◽  
Zuiko KOJA ◽  
Suiho TOKASHIKI
Keyword(s):  
Domestic Fowl ◽  
Gonadal Hormones ◽  
Shell Formation

SULFONAMIDES AND EGG-SHELL FORMATION IN THE DOMESTIC FOWL

Science ◽  
1945 ◽  
Vol 101 (2633) ◽  
pp. 617-618 ◽  
Author(s):  
R. BERNARD ◽  
P. GENEST
Keyword(s):  
Domestic Fowl ◽  
Shell Formation ◽  
Egg Shell

EFFECT OF GONADAL HORMONES, GONADOTROPHINS AND THYROXINE ON PLASMA FREE FATTY ACIDS IN THE DOMESTIC FOWL

1964 ◽  
Vol 30 (1) ◽  
pp. 115-130 ◽  
Author(s):  
P. J. HEALD ◽  
K. A. ROOKLEDGE
Keyword(s):  
Anterior Pituitary ◽  
Domestic Fowl ◽  
Plasma Lipids ◽  
Plasma Free Fatty Acid ◽  
Pituitary Hormones ◽  
Gonadal Hormones ◽  
Total Lipids ◽  
Follicular Growth ◽  
Oestrogen Treatment ◽  
Plasma Ffa

SUMMARY The effects of oestrogens, testosterone, thyroxine, avian and mammalian gonadotrophins and of fasting, on the plasma free fatty acid (FFA) levels in the domestic fowl were investigated. Oestrogen treatment increased the levels of plasma FFA simultaneously with those of the total lipids and lipophosphoprotein in the immature fowl. Testosterone and thyroxine decreased the levels of plasma lipids and of lipophosphoprotein in the laying fowl, but had no effect upon the levels of plasma FFA in either the immature or laying fowl. Gonadotrophins were without effect upon the plasma FFA in the immature pullet but increased the levels in laying or moulting birds, the increases being accompanied by marked follicular growth. Fastings increased the level of plasma FFA in immature birds, but decreased the levels of FFA and total lipid in laying birds. Injections of large doses of hog anterior pituitary extract were without effect on the plasma FFA in conscious immature pullets but induced marked increases in the plasma FFA and a gross lipaemia in the rabbit. It is considered that the increases in plasma FFA found when the bird comes into lay are an indirect result of ovarian stimulation by pituitary hormones.

scholarly journals Intracellular pH during calcification. A study of the avian shell gland

1969 ◽  
Vol 111 (5) ◽  
pp. 647-652 ◽  
Author(s):  
K. Simkiss
Keyword(s):  
Intracellular Ph ◽  
Domestic Fowl ◽  
Shell Gland ◽  
Shell Formation ◽  
Extracellular Water ◽  
Rapid Fall ◽  
Egg Shell

The intracellular pH of the shell gland of the domestic fowl was calculated at various stages in egg-shell formation. The calculation is based on the distribution of 5,5-dimethyloxazolidine-2,4-dione between intracellular and extracellular water. The results show a rapid fall in intracellular pH at the time of mineralization and this is interpreted as indicating a removal of protons from the site of calcification.

THE INFLUENCE OF GONADAL HORMONES ON THE COMPOSITION OF THE BLOOD AND LIVER OF THE DOMESTIC FOWL

1946 ◽  
Vol 5 (5) ◽  
pp. 263-273 ◽  
Author(s):  
R. H. COMMON ◽  
W. BOLTON ◽  
W. A. RUTLEDGE
Keyword(s):  
Domestic Fowl ◽  
Gonadal Hormones

scholarly journals The Effects of Gonadal Hormones on Hyperossification in the Domestic Fowl

1969 ◽  
Vol 48 (4) ◽  
pp. 1414-1420 ◽  
Author(s):  
George J. Mulkey ◽  
Edward F. Godfrey
Keyword(s):  
Domestic Fowl ◽  
Gonadal Hormones

STUDIES ON THE GLYCOPROTEINS OF THE DOMESTIC FOWL: II. THE HEXOSAMINE CONTENT OF CERTAIN TISSUES OF THE SEXUALLY IMMATURE PULLET AND SOME EFFECTS THEREON OF GONADAL HORMONES

1955 ◽  
Vol 33 (1) ◽  
pp. 627-637 ◽  
Author(s):  
P. A. Anastassiadis ◽  
W. A. Maw ◽  
R. H. Common
Keyword(s):  
Domestic Fowl ◽  
Dry Matter ◽  
Testosterone Propionate ◽  
Estradiol Benzoate ◽  
Gonadal Hormones ◽  
Relative Increase ◽  
Total Serum ◽  
Free Base ◽  
Concurrent Administration ◽  
Hexosamine Content

The concentration of total hexosamine (as free base) in the dry matter of tissues of the pullet was high in cartilage (8.0 mgm. per gm.) and in oviduct (6.4 mgm. per gm.); medium in comb and wattles, tendon, and lungs (3.0 to 5.5 mgm. per gm.); and low in voluntary muscle (1.5 mgm. per gm.). Dry defatted skin contained 8.3 mgm. per gm. Total serum hexosamine was 52 mgm. per 100 ml. and was increased significantly to about 67 mgm. per 100 ml. by treatment with estradiol benzoate (ODB) and to about 72 mgm. per 100 ml. by ODB plus testosterone propionate (TST). Serum protein was also increased significantly by the hormonal treatments, but to a relatively greater extent. The magnum of the hypertrophied oviducts of pullets treated with ODB was relatively high in dry matter (22.0%), and this dry matter was relatively rich in hexosamine (13.8 mgm. per gm.) and low in hydroxyproline (2.9 mgm. per gm.). The dry matter of the uterus and vagina was relatively low in hexosamine (6.0 mgm. per gm.) and rich in hydroxyproline (5.7 and 10.5 mgm. per gm. for uterus and vagina respectively). Concurrent administration of ODB and TST led to a greater degree of hypertrophy of the oviducts than did administration of ODB alone; both the weight and total hexosamine content of the magnum showed a greater relative increase than did the values for vagina and uterus. Some modifications of the method of determining the hexosamine content of tissues are described.

THE EFFECTS OF GONADAL HORMONES ON THE LEVELS OF PITUITARY LUTEINIZING HORMONE IN THE DOMESTIC FOWL

1968 ◽  
Vol 41 (3) ◽  
pp. 313-318 ◽  
Author(s):  
P. J. HEALD ◽  
K. A. ROOKLEDGE ◽  
B. E. FURNIVAL ◽  
G. D. WATTS
Keyword(s):  
Luteinizing Hormone ◽  
Domestic Fowl ◽  
Testosterone Propionate ◽  
Gonadal Hormones ◽  
Laying Hen ◽  
Ovulatory Cycle ◽  
Specific Point ◽  
Physiological Level ◽  
Oestradiol Benzoate ◽  
Random Intervals

SUMMARY Groups of laying mature domestic fowl were injected i.m. with varying doses of either oestradiol benzoate, testosterone propionate or progesterone and were killed at random intervals throughout the day without reference to any specific point in the ovulatory cycle. Luteinizing hormone (LH) was assayed in the anterior pituitaries of each group. It was shown that oestradiol in doses calculated to be equal to or above the physiological level, increased pituitary LH without necessarily affecting the laying cycle. Testosterone had no significant effect on pituitary LH, while progesterone significantly increased pituitary LH at doses which had no apparent effect upon ovulation. Doses effective in the laying hen had little or no effect on the pituitary content of LH in immature birds. The results in the laying hen are in harmony with the concept previously proposed, by which changes in the levels of circulating plasma oestrogens may regulate the ovulatory pattern of the fowl by inhibiting release of pituitary LH.

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