Insulin-like growth factor I during growth in bulls.

@article{Ronge1989InsulinlikeGF,
  title={Insulin-like growth factor I during growth in bulls.},
  author={H. Ronge and J{\"u}rg W. Blum},
  journal={Reproduction, nutrition, developpement},
  year={1989},
  volume={29 1},
  pages={
          105-11
        }
}
  • H. Ronge, J. Blum
  • Published 1989
  • Biology, Medicine
  • Reproduction, nutrition, developpement
In 10 bulls, changes in blood plasma concentrations of insulin-like growth factor I (IGF1) were studied during rearing and during the ensuing growth period. IGF1 continuously increased from 32 micrograms/l at the age of 15 d to 194 micrograms/l at the age of 307 d together with body weight. However, IGF1 was not related to daily rate of gain, which remained fairly constant during the growth period. An age-dependent increase was also observed for blood levels of insulin, thyroxine and… 
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TLDR
During insufficient energy and (or) protein intake, characterized by low glucose, insulin and thyroid hormone levels and increased non-esterified fatty acid concentrations, insulin-like growth factor I concentrations and responses to GH administration were markedly reduced.
Dissociation of increases in plasma insulin-like growth factor I and testosterone during the onset of puberty in bulls.
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Concentrations of testosterone, IGF-I and IGFBP-3 increase together, but probably independently, during the onset of puberty in male calves, similar to that reported for the control group.
Are IGF-I, thyroid hormone and metabolite concentrations in calf plasma associated with growth rate, sex and age?
TLDR
Observations show that there are age-dependent changes in IGF-I and glucose concentrations (but not in those of other substances), and that IGF- I and glucose, in contrast with other substances, may be indicators or regulators of individual growth rates.
Immunoreactive insulin-like growth factor I and insulin in blood plasma and milk of mares and in blood plasma of foals.
TLDR
In mares and their foals, concentration of immunoreactive insulin-like growth factor I (iIGF-I) in plasma increased during late pregnancy, peaked 2 days after parturition, and then gradually declined until weaning, while colostrum iI and iI behaved similarly, in mares compared with dairy cows.
Effects of dexamethasone and colostrum intake on the somatotropic axis in neonatal calves.
TLDR
Dexa and colostrum feeding promoted maturation of the somatotropic axis and increased IGF-I mRNA levels only in formula-fed calves and increased hepatic GHR binding capacity, but only in Colostrum- fed calves.
Different periods of feed restriction before compensatory growth in Belgian Blue bulls: II. Plasma metabolites and hormones.
TLDR
Higher nutrient supply improved the functionality of the somatotropic axis and increased the concentration of anabolic hormones, allowing rapid muscle deposition in double-muscled Belgian Blue bulls, but animals underfed the longest period behaved differently from the other groups, possibly because they reached a more complete sexual maturity.
Muscle characteristics and corresponding hormone concentrations in different types of cattle
Abundance of message for insulin-like growth factors-I and -II and for receptors for growth hormone, insulin-like growth factors-I and -II, and insulin in the intestine and liver of pre- and full-term calves.
The somatotropic axis and insulin are involved in pre- and postnatal development. In pre- and full-term calves (GrP0 and GrN0; born after 277 and 290 d of pregnancy, respectively) and in preterm…
Seminal plasma insulin-like growth factor I and total protein concentration in peripubertal period of the Gyr bulls.
TLDR
Seminal plasma total proteins are involved in peripubertal modifications and IGF-I from Zebus dairy bulls can influence the seminal characteristics and the growth factor increase occurs concomitantly with body growth but cannot be used to define puberty bulls earlier.
Plasma insulin-like growth factor-1 concentration in dogs with chronic enteropathies
TLDR
The increase of the IGF-1/BW ratio after treatment suggests that plasma IGF- 1 concentration may help to judge the outcome of chronic enteropathies in dogs.
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References

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Insulin-like growth factor I stimulates growth in hypophysectomized rats
TLDR
It is reported that pure IGF I stimulates the growth of hypophysectomized rats in a dose-dependent manner, which strongly supports the notion that the action of growth hormone is mediated by peptides of the somatomedin family.
Effect of pituitary somatotropin injections on plasma insulin-like growth factor I and somatotropin profiles in growing heifers.
TLDR
This study validates a method for measuring IGF-I in cattle, and shows a positive relationship among IGF- I and ADG after ST treatment, and finds no correlation, however, was found between plasma ST and growth performance.
The somatotrophic axis in young steers: influence of nutritional status on pulsatile release of growth hormone and circulating concentrations of insulin-like growth factor 1.
TLDR
Upon realimentation, plasma GH concentrations decreased in both previously undernourished groups, with those fed 1% dry matter still having increased levels 10 days after refeeding, and plasma IGF-1 concentrations showed no periodicity.
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Body size parallels insulin-like growth factor I levels but not growth hormone secretory capacity.
TLDR
Results show that body weight is correlated with IGF I levels rather than with the GH secretory capacity, thus providing indirect evidence for IGF I as an important in vivo growth-promoting principle.
Insulin-like growth factor I in the dog: a study in different dog breeds and in dogs with growth hormone elevation.
TLDR
The dose-response curve obtained by canine IGF I paralleled the one obtained by human IGF I, and the mean IGF I level in a group of dogs with growth hormone (GH) elevation was significantly differed from the one found in German Shepherds, the largest breed studied.
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TLDR
IGFs, somatomedins are structural homologues of insulin with insulin-like biological activity that stimulate growth indices in vitro and in vivo, but, in contrast to the free factors, do not exert acute effects on insulin target tissues.
Radioimmunological determination of insulinlike growth factors I and II in normal subjects and in patients with growth disorders and extrapancreatic tumor hypoglycemia.
Serum levels of immunoreactive insulinlike growth factors (IGF) I and II were determined by a modified IGF I and a new IGF II radioimmunoassay in normal children and adults, and in patients with…
Concentrations of hormones in plasma from cattle with different growth potentials.
TLDR
The results of this study suggested that there are differences in hormone concentrations that are related to size rather than being the result of differences in physiological maturity of different breeds of cattle.
Reduced and compensatory growth: endocrine and metabolic changes during food restriction and refeeding in steers.
TLDR
The data demonstrate the ability of growing ruminants to adapt rapidly to variations in food intake by closely linked metabolic and endocrine changes, which are associated with shifts in energy and nitrogen metabolism and, finally, by reduced or compensatory growth.
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