The role of thyroid hormones in the growth hormone response to protein restriction in the domestic fowl (Gallus domesticus)

Lauterio, Thomas J.; Scanes, Colin G.

doi:10.1677/joe.0.1170223

Cited by 17 publications

(9 citation statements)

References 17 publications

(18 reference statements)

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“…These results support the hypothesis that serum IGF‐I plays a role in growth and in efficiency of feed utilization in beef cattle. Chickens consuming a low protein diet exhibit depressed plasma IGF‐I concentrations, which return to normal on restoration of dietary protein (Lauterio and Scanes, 1988; Rosebrough et al., 1989; Rosebrough and McMurtry, 1993). Studies showed that protein deficiency (Thissen et al., 1994; Ketelslegers et al., 1995) and methionine deficiency could depress the IGF concentration in small rabbits.…”

Section: Resultsmentioning

confidence: 99%

Effect of dietary methionine on growth performance and insulin-like growth factor-I mRNA expression of growing meat rabbits

Zhang

2010

Journal of Animal Physiology and Animal Nutrition

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An experiment was conducted to determine the effects of different amounts of dietary methionine on growth performance, serum protein, growth hormone (GH), insulin-like growth factor-I (IGF-I) concentrations and IGF-I mRNA expression of growing meat rabbits. One hundred weaned growing meat rabbits were allocated to individual cages and randomly divided into five groups. The methionine addition concentrations of the five groups were 0, 2, 4, 6 and 8 g/kg diet (as-fed basis) and sulphur amino acids (SAA) concentrations ranging from 3.8 to 11.6 g/kg diet, respectively. The results obtained were as follows: the average daily gain of 2, 4 and 6 g/kg diet groups was higher than that of 0 g/kg diet group (p < 0.01). The feed gain ratio of the 4 g/kg diet group was lower than those of 0 and 8 g/kg diet group (p < 0.01). Methionine concentrations did not affect serum urea nitrogen, total protein, insulin and IGF-I concentration (p > 0.05). The quadratic effects of methionine on the serum concentration of albumin (Alb) and GH were obtained (p = 0.013, p = 0.018). The quadratic effect of methionine amount on IGF-I mRNA expression was obtained (p = 0.045). The serum concentration of Alb of the 4 g/kg diet group was higher than those of 0 and 8 g/kg diet group (p < 0.01). The serum concentration of GH of 8 g/kg diet group was higher than that of the 0 g/kg diet group (p < 0.05). The liver IGF-I mRNA expression of 4 g/kg diet group was higher than those of the 0 and 8 g/kg diet group (p < 0.05). Providing a diet mainly consisted of corn, wheat bran and peanut vine, the optimum dietary methionine addition concentration and SAA concentration for a weaner to 2-month-old growing meat rabbits were shown to be 2 and 5.7 g/kg diet respectively.

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Section: Resultsmentioning

confidence: 99%

Effect of dietary methionine on growth performance and insulin-like growth factor-I mRNA expression of growing meat rabbits

Zhang

2010

Journal of Animal Physiology and Animal Nutrition

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“…Studies conducted by Scanes et al (1981) and Lauterio and Scanes (1988) have confirmed that fasting birds and those consuming diets with some nutrient restrictions (protein or energy) display reduced IGF-I mRNA expression. Rosebrough and McMurtry (1993) have also observed lower plasmatic IGF-I levels in broilers under nutrient restriction.…”

Section: Discussionmentioning

confidence: 96%

Expression of growth genes in response to glycerol use in Japanese quail diets

Gasparino¹,

Neto²,

Vesco³

et al. 2012

Genet. Mol. Res.

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ABSTRACT. Glycerol can be used as a substitute for corn for feeding poultry, but there are concerns about how it may affect growth performance and health of the birds. We evaluated the expression of mRNA of growth hormone (GH) and insulin-like growth factor I (IGF-I) in 35-day-old Japanese quails fed different glycerol levels (0, 4, and 8% dietary glycerol instead of corn). Total RNA was extracted from the breast muscle and cDNA was amplified with the use of specific primers for these genes using real-time PCR. Quails fed the diet with 8% glycerol supplementation had significantly lower GH mRNA and IGF-I mRNA expression than those fed no glycerol or 4% glycerol. No significant effect of the treatments was found on quail weight gain or feed intake. Feed conversion ratio was influenced by dietary glycerol levels: the group fed 8% glycerol displayed the worst feed conversion ratio (2.54) compared with that of quail fed the control diet (2.35) or 4% glycerol (2.36). Considering quail performance and the expression of the genes GH and IGF-I, a level of 4% glycerol can be used in quail feeding without any harmful effects.

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“…In females, TRH had no effect on growth parameters. Previous observations on chickens (Harvey et al, 1978;Burkę, 1983;Leung et al, 1984;Lauterio and Scanes, 1987) and ducks (Folzer-Joudaione et al, 1988) established that TRH not only stimulates the release of thyroid hormones but also is a potent stimulant of GH secretion. Remarkable differences in GH response between małe and female broilers were seen in the form of higher plasma GH concentrations in males (Harvey et al, 1977;Johnson et al, 1990).…”

Section: Discussionmentioning

confidence: 98%

The influence of thyrotropin-releasing hormone (TRH) on growth rate and thyroid activity in broiler chicks

Wir-Konas¹,

Ryś²,

Pietras³

1992

J. Anim. Feed Sci.

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Twenty-eight-day old broiler chicks were used to determine growth rate and thyroid activity responses to various doses and routes of administration of synthetic thyrotropin-releasing hormone (TRH). In experiment 1, daily intramuscular (im.) injections of 2 fig TRH / chick over 10 or 20 days stimulated the relative body weight gain in cockerels by 5,7 and 10%, respectively, compared with saline injected controls. In experiment 2, TRH administered im. (2 fig /chick) or orally (80 fig /chick) over 10 days significantly increased (P ^ 0.01) the relative body weight gain of cockerels by 20.3 and 29.6%, respectively and slightly improved feed conversion efficiency. No effect of TRH on the growth rate of female chicks was found. Treatment with TRH induced a marked increase of relative thyroid size, basal metabolic rate and plasma triiodothyronine and thyroxine levels. Our data confirmed earlier reports that improvement in growth rate of TRH-treated chicks appears to be mediated by thyroid hormones.

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The role of thyroid hormones in the growth hormone response to protein restriction in the domestic fowl (Gallus domesticus)

Cited by 17 publications

References 17 publications

Effect of dietary methionine on growth performance and insulin-like growth factor-I mRNA expression of growing meat rabbits

Effect of dietary methionine on growth performance and insulin-like growth factor-I mRNA expression of growing meat rabbits

Expression of growth genes in response to glycerol use in Japanese quail diets

The influence of thyrotropin-releasing hormone (TRH) on growth rate and thyroid activity in broiler chicks

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