Effects of monosodium glutamate on circulating concentrations of luteinizing hormone and growth hormone in young growing domestic fowl (Gallus domesticus)

1982 ◽  
Vol 38 (10) ◽  
pp. 1246-1247 ◽  
Author(s):  
C. G. Scanes ◽  
A. Camaratto
Keyword(s):  
Growth Hormone ◽  
Luteinizing Hormone ◽  
Domestic Fowl ◽  
Monosodium Glutamate ◽  
Gallus Domesticus

Effect of synthetic thyrotrophin-releasing hormone and its analogues on growth hormone secretion in the domestic fowl (Gallus Domesticus)

1981 ◽  
Vol 97 (4) ◽  
pp. 448-453 ◽  
Author(s):  
C. G. Scanes ◽  
S. Harvey ◽  
B. A. Morgan ◽  
M. Hayes
Keyword(s):  
Growth Hormone ◽  
Domestic Fowl ◽  
Hormone Secretion ◽  
Growth Hormone Secretion ◽  
Gallus Domesticus ◽  
Plasma Growth Hormone ◽  
Thyrotrophin Releasing Hormone ◽  
Releasing Hormone ◽  
Gh Secretion ◽  
Trh Analogues

Abstract. Variations in plasma growth hormone (GH) concentrations following iv or sc administration of synthetic thyrotrophin-releasing hormone (TRH, Pyr-His-Pro-NH2) have been followed in immature and adult domestic fowl. TRH markedly stimulated GH secretion in newly hatched (1 and 2 day old) chicks and in 6-week-old cockerels but in adult male or female birds of two strains had very little effect, if any. Intravenous injection of 4 TRH analogues (Pyr-His-Mep-NH2, Pyr-Meh-Mep-NH2, Pyr-Meh-Mep-NH and Pyr-Meh-Pro-NH2) were also potent GH secretagogues in 6-week-old birds. The stimulatory effect of TRH or the TRH-analogues on GH secretion was not dose-related.

EFFECT OF LUTEINIZING HORMONE ON PROGESTERONE SECRETION IN VITRO BY THE GRANULOSA CELLS OF THE DOMESTIC FOWL (GALLUS DOMESTICUS)

1980 ◽  
Vol 84 (2) ◽  
pp. 249-254 ◽  
Author(s):  
J. W. WELLS ◽  
A. B. GILBERT ◽  
J. CULBERT
Keyword(s):  
Luteinizing Hormone ◽  
Granulosa Cells ◽  
Peripheral Blood ◽  
Domestic Fowl ◽  
Gallus Domesticus ◽  
Preovulatory Follicle ◽  
Progesterone Secretion ◽  
Physicochemical Methods

During short periods of incubation (3 h) the secretion of progesterone by granulosa cells from the largest preovulatory follicle of the fowl was higher (160 pmol/μg DNA) with ovine LH in the medium than without it (60 pmol/μg DNA). Granulosa cells from follicles collected 24 and 48 h before their expected ovulation secreted progesterone at similar rates to cells from the largest follicle which was likely to ovulate within 5 h. The identity of progesterone was confirmed by physicochemical methods. After granulosa cells had been incubated with LH in Medium 199 for 24 h, the concentration of progesterone in the medium was 1·65 μmol/l whereas oestrone and oestradiol were present at concentrations of 254 and 199 pmol/l respectively. The results indicate that the larger yellow yolk-filled follicles of the ovarian hierarchy in the domestic fowl contribute to the preovulatory surge of progesterone which has been observed in the peripheral blood.

VARIATIONS IN CONCENTRATIONS OF PROLACTIN, LUTEINIZING HORMONE, GROWTH HORMONE AND PROGESTERONE IN THE PLASMA OF BROODY BANTAMS (GALLUS DOMESTICUS)

1979 ◽  
Vol 80 (1) ◽  
pp. 51-57 ◽  
Author(s):  
P. J. SHARP ◽  
C. G. SCANES ◽  
J. B. WILLIAMS ◽  
S. HARVEY ◽  
A. CHADWICK
Keyword(s):  
Growth Hormone ◽  
Luteinizing Hormone ◽  
Laying Hens ◽  
Reproductive Activity ◽  
Prolactin Secretion ◽  
Gallus Domesticus

The concentrations of prolactin, LH, progesterone and GH were measured in the blood of broody bantam hens. The concentration of prolactin was at its highest when the birds began to incubate their eggs and in six out of nine hens it tended to remain raised until the eggs hatched. The increase in the concentration of prolactin was small: in incubating hens it was only 23% higher than in hens caring for their young and 14% higher than in laying hens (P < 0·05 for both comparisons). The concentration of GH tended to be depressed in hens caring for young but otherwise was not related to reproductive activity. The concentrations of LH and progesterone decreased at the onset of incubation and remained depressed while the hens sat on their eggs (P < 0·001 for both comparisons). After the chicks hatched, the level of LH began to increase slowly whereas the level of progesterone remained low. The hens stopped showing broody behaviour between 4 and 10 weeks after the chicks had hatched; this corresponded to the time when the concentration of LH had increased to values found in laying hens. These observations provide some evidence that prolactin secretion increases at the onset of incubation and support the view that the hormone is not secreted at an increased rate while hens are caring for their young.

INFLUENCE OF FASTING, GLUCOSE AND INSULIN ON THE LEVELS OF GROWTH HORMONE AND PROLACTIN IN THE PLASMA OF THE DOMESTIC FOWL (GALLUS DOMESTICUS)

1978 ◽  
Vol 76 (3) ◽  
pp. 501-506 ◽  
Author(s):  
S. HARVEY ◽  
C. G. SCANES ◽  
A. CHADWICK ◽  
N. J. BOLTON
Keyword(s):  
Growth Hormone ◽  
Carbohydrate Metabolism ◽  
Domestic Fowl ◽  
Fasting Glucose ◽  
Gallus Domesticus ◽  
Consistent Effect

The concentrations of both GH and prolactin in the circulation of the domestic fowl have been determined after various treatments known to affect carbohydrate metabolism. Fasting decreased the level of glucose, stimulated the secretion of GH and inhibited the secretion of prolactin. Administration of insulin significantly depressed the level of GH in the plasma of normal or fasted birds and also in chickens which had received simultaneous injections of glucose or 2-deoxy-d-glucose. No consistent effect of insulin on the secretion of prolactin was observed. Hyperglycaemia subsequent to administration of glucose had no effect on the levels of either GH or prolactin. Glucagon-induced hyperglycaemia suppressed the level of GH in the plasma and stimulated that of prolactin.

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