Plasma growth hormone concentrations during growth in turkeys

Harvey, S.; Godden, Patricia M. M.; Scanes, Colin G.

doi:10.1080/00071667708416402

Cited by 37 publications

(10 citation statements)

References 10 publications

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“…The failure of GH to increase growth is consistent with the finding that the growth stimulatory potency of GH decreases as the age or body weight of birds increases (Harvey et al, 1977;Proudman and Wentworth, 1979). However, Proudman and Wentworth (1978) have demonstrated parallel dose-response curves between turkey GH and pituitary extracts, as well as among sera samples from turkeys, fowls and quail.…”

Section: Means For Body Weight Ovary-oviduct Weight Shank Length Asupporting

confidence: 82%

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Roles of age, body weight and composition in the initiation of sexual maturation of Japanese quail (coturnix coturnix japonica)

Oruwari

Brody

1988

British Poultry Science

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1. The roles of chronological age, body weight and body composition in the initiation of sexual maturation of Japanese quail (Coturnix coturnix japonica) were investigated by imposing an inhibitory photoperiod (IP), and by the intramuscular injection of turkey growth hormone (GH) or antisera to turkey growth hormone (AGH). 2. Absence of sexual maturity in the IP treatment was accompanied by reduced testis and ovary-oviduct weights, and an increased breast muscle weight expressed as a proportion of body weight. 3. Antisera to turkey growth hormone (AGH) did not completely inhibit the metabolic activities of endogenous GH. 4. The roles of chronological age, body weight and body composition in the initiation of sexual maturity were inseparable.

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Section: Means For Body Weight Ovary-oviduct Weight Shank Length Asupporting

confidence: 82%

“…In avian species, an inverse correlation between growth hormone (GH) and age or body weight has been found (Harvey et al, 1977;Proudman and Wentworth, 1979), and GH suppressive actions of anti-GH serum have been reported . However, a prerequisite for the onset of sexual maturity is the maturity of the gonads.…”

Section: Introductionmentioning

confidence: 98%

Roles of age, body weight and composition in the initiation of sexual maturation of Japanese quail (coturnix coturnix japonica)

Oruwari

Brody

1988

British Poultry Science

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“…In the present investigation the variations in the concentrations of plasma GH during the growth period of control and testosterone treated turkeys were similar to those observed in previous avian studies Harvey et al, 1977a). In both groups the circulating GH level and the percentage weekly body weight gain were directly correlated, but there appears to be no simple relationship between GH concentration and growth rate, differences between the controls and implanted birds in GH level not being consistently reflected by similar differences between the groups in body weight gain.…”

Section: Resultssupporting

confidence: 90%

“…same plasma GH concentrations as birds kept in constant darkness (Harvey, 1977). However, it is possible that this fall in GH concentration might be due to the change in diet between 4 and 5 weeks of age, although in a previous study (Harvey et al, 1977a) no such fall in GH level was observed at this time in male turkeys reared under similar conditions.…”

Section: Resultsmentioning

confidence: 69%

“…In chickens and turkeys, recent studies have established that marked differences in the concentration of plasma growth hormone (GH) occur during growth and maturation (Harvey et al, 1977a;1977b;Scanes et al, 1977). In these species there is some correlation between the circulating GH concentration and the rate of body growth, being high in young rapidly growing birds and low in mature adults.…”

Section: Introductionmentioning

confidence: 97%

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Plasma Growth Hormone Levels in Normal and Testosterone Implanted Growing Turkeys

1979

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The growth of normal and testosterone implanted female turkeys was followed between 2 and 16 weeks of age and the concentration of immunoreactive growth hormone (GH) in the peripheral plasma measured. The testosterone treated birds were larger than the controls between 3 and 11 weeks of age. In both groups the plasma GH levels were inversely correlated with the bird's age and body weight and directly correlated with the percentage weekly weight gain Plasma GH concentrations in the testosterone treated birds were higher than in the controls at 4 weeks of age and lower at 3, 6, 7, 8, and 9 weeks of age. Significant differences between the groups in percentage weekly weight gain were not consistently associated with corresponding differences in plasma GH level.

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Growth hormone: Its physiology and control

Scanes

Lauterio

1984

J. Exp. Zool.

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Growth hormone (GH) is a protein hormone produced by the somatotrophs of the anterior pituitary gland of birds and other vertebrates. The secretion of GH in birds is under hypothalamic control; it involves three peptidergic releasing factors: growth hormone-releasing factor (GRF) (stimulatory); thyrotropin-releasing hormone (TRH) (stimulatory); and somatostatin (SRIF) (inhibitory). In addition, there is evidence for effects of biogenic amines (including serotonin and norepinephrine) and prostaglandins at the level of the hypothalamus and possibly also the pituitary gland. In all avian species examined, plasma concentrations of GH are high in young posthatching chicks but low in the adult and embryo. The difference in plasma concentrations of GH between young and adult birds is due to both greater GH secretion and reduced clearance. The lower secretion of GH in adult birds reflects fewer somatotrophs in the pituitary, changes in somatotroph structure, and reduced GH responses to TRH or GRF administration. There is only limited data on the role of GH in birds. GH appears to be required for normal growth; acting at least in part by increasing somatomedin production. However, plasma concentrations of GH do not necessarily correlate with growth rate. For instance, in chicks with reduced growth rate owing to either goitrogen or protein deficiency in the diet, plasma concentrations of GH are elevated. GH also can influence lipid metabolism by increasing lipolysis, decreasing lipogenesis, and stimulating the uptake of glucose by adipose tissue. The physiological significance of these actions is, however, not established. In addition, GH affects the secretion of other hormones, the immune system, and perhaps also the reproductive system.

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Plasma growth hormone concentrations during growth in turkeys

Cited by 37 publications

References 10 publications

Roles of age, body weight and composition in the initiation of sexual maturation of Japanese quail (coturnix coturnix japonica)

Roles of age, body weight and composition in the initiation of sexual maturation of Japanese quail (coturnix coturnix japonica)

Plasma Growth Hormone Levels in Normal and Testosterone Implanted Growing Turkeys

Growth hormone: Its physiology and control

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