Effect of a Phosphorus Deficiency on Thyroid Function and Growth Hormone in the White Leghorn Male

Carew, L. B.; Gestone, T. A.; Alster, F. A.; Scanes, Colin G.

doi:10.3382/ps.0642010

Cited by 6 publications

(7 citation statements)

References 9 publications

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“…Nevertheless, the increase in pituitary weight conforms to the observation made here and earlier (Carew et al, 1985) that there is less than expected serum GH in P-deficient chicks and suggests inhibited release by the pituitary gland. There is a tendency for pituitary weight to increase as pituitary GH activity increases and plasma GH content decreases (Engster et al, 1979).…”

Section: Resultssupporting

confidence: 91%

“…Data concerning the effect of a P deficiency on either pituitary weights or plasma GH levels are extremely limited (Carew et al, 1985). Nevertheless, the increase in pituitary weight conforms to the observation made here and earlier (Carew et al, 1985) that there is less than expected serum GH in P-deficient chicks and suggests inhibited release by the pituitary gland.…”

Section: Resultssupporting

confidence: 81%

“…This contrasts with the enlarged thyroid glands we found earlier (Carew et al, 1985) in much older White Leghorn males mildly deficient in P, and suggests that age, breed, and severity of deficiency are important determinants of thyroid function during the deficiency. There were also no changes in thyroid weight as a result of pairfeeding, and this agrees with results reported by Appledorf et al (1969) and Balzer (1980).…”

Section: Resultscontrasting

confidence: 78%

“…Little precise information is available, however, as to the extent to which P deficiency affects the function of thyroid or growth hormones in either mammalian (Lee et al, 1980) or avian species. To date only one report has appeared about chickens (Carew et al, 1985). This report showed that thyroid weight increased and plasma growth hormone level decreased during a mild P deficiency in Leghorn males 66 to 96 days of age, with no 'Research supported by the Vermont Agricultural Experiment Station, University of Vermont, Hatch Project VT 339.…”

Section: Introductionmentioning

confidence: 86%

“…Levels of Ca, P, thyroxine (T 4 ), 3,5,3'triiodothyronine (T 3 ), and GH were analyzed in serum as described previously (Carew et al, 1985). The method for measuring reverse T 3 is also described elsewhere (Carew et al, 1983).…”

Section: Serum Calcium Phosphorus and Hormone Determinationsmentioning

confidence: 99%

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Thyroid Function, Growth Hormone, and Organ Growth in Broilers Deficient in Phosphorus

et al. 1987

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The effects of a dietary P deficiency on thyroid function, serum growth hormone, and growth parameters in 10 to 29-day-old broiler cockerels was determined. Chicks fed severely P-deficient diets (.05% or .10% available P) grew more slowly and ate less feed than controls fed .65% P. The deficiency was also accompanied by hypercalcemia, hypophosphatemia, and decreases in percent bone ash, fat-free tibial weight, and tibial length and width. Increases in the relative weights of kidneys, hearts, and pituitary glands (.05% P only) occurred as well. Most of these changes occurred to a lesser extent or not at all in pair-fed controls, showing that they resulted specifically from the P deficiency and were not simply a result of reductions in feed intake. Phosphorus deficiency also was accompanied by peripheral edema and hydropericardium. Relative thyroid weight was unaffected. Serum triiodothyronine was consistently lower in the P-deficient chicks, although effects were significant only in one experiment. Thyroxine levels tended to be low also, but not consistently so. Serum growth hormone in P-deficient chicks in both studies was consistently lower than that in pair-fed controls, but this was significant only when .10% but not .05% available P was fed. The findings suggest that serum levels of both thyroid hormone and growth hormone are altered by P deficiency, but the results were not clearly definitive.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 81%

Section: Resultscontrasting

confidence: 78%

Section: Introductionmentioning

confidence: 86%

Section: Serum Calcium Phosphorus and Hormone Determinationsmentioning

confidence: 99%

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Thyroid Function, Growth Hormone, and Organ Growth in Broilers Deficient in Phosphorus

et al. 1987

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Interactive Effects of Copper Sources and a High Level of Phytase in Phosphorus-Deficient Diets on Growth Performance, Nutrient Digestibility, Tissue Mineral Concentrations, and Plasma Parameters in Nursery Pigs

Ren¹,

Chen²,

Hancock³

et al. 2021

Biol Trace Elem Res

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The present study investigated the interactive effects of copper sources and a high level of phytase on growth performance, nutrient digestibility, tissue mineral concentrations, and plasma parameters in nursery pigs. Weaning piglets (N = 192; 6.06 ± 0.99 kg), blocked by body weight, were randomly allotted to 1 of 4 dietary treatments, with 12 pens per treatment and 4 pigs per pen. A basal diet for each phase was formulated to meet nutrient requirements for nursery pigs with the exception that standardized total tract digestibility (STTD) P was reduced by 0.12% and Ca was adjusted to achieve Ca/STTD P = 2.15. The 4 dietary treatments were arranged in a 2 × 2 factorial design, with 2 Cu sources (125 mg/kg Cu from copper methionine hydroxy analogue chelate (Cu-MHAC) or copper sulfate (CuSO4)) and 2 phytase levels (0 or 1500 phytase units (FTU)/kg). Results showed that there was an interaction (P < 0.05) between Cu sources and phytase on ADG during days 0–41. When phytase was not present in the diets (P deficient), there was no difference between the two Cu sources in terms of ADG during days 0–41, whereas with phytase in the diets, Cu-MHAC tended to improve (P < 0.10) ADG during days 0–41 compared with CuSO4. Pigs fed Cu-MHAC had greater apparent total tract digestibility (ATTD) of neutral and acid detergent fiber and STTD of P than those fed CuSO4. Phytase increased (P < 0.05) growth performance, ATTD of Ca and P, and plasma inositol and growth hormone concentrations. In conclusion, Cu-MHAC may be more effective in improving growth rate than CuSO4 when phytase was supplemented at 1500 FTU/kg. Cu-MHAC enhanced fiber and P digestibility regardless of phytase, compared with CuSO4. Phytase addition in P-deficient diets was effective in improving growth performance, Ca and P digestibility, and plasma inositol and growth hormone concentrations.

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Factors Influencing the Growth of Normal and Neoplastic Thyroid Tissue

Duh

Clark

1987

Surgical Clinics of North America

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Effect of a Phosphorus Deficiency on Thyroid Function and Growth Hormone in the White Leghorn Male

Cited by 6 publications

References 9 publications

Thyroid Function, Growth Hormone, and Organ Growth in Broilers Deficient in Phosphorus

Thyroid Function, Growth Hormone, and Organ Growth in Broilers Deficient in Phosphorus

Interactive Effects of Copper Sources and a High Level of Phytase in Phosphorus-Deficient Diets on Growth Performance, Nutrient Digestibility, Tissue Mineral Concentrations, and Plasma Parameters in Nursery Pigs

Factors Influencing the Growth of Normal and Neoplastic Thyroid Tissue

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