Plasma Estrogen, Calcium, and Shell Quality in Two Strains of White Leghorns

Grunder, A. A.; Hollands, K. G.; Tsang, Charles P.W.

doi:10.3382/ps.0621294

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…The observed increase in the calcium content of serum in 50 g kg −1 Gp treatment could be related to the higher concentration of estradiol and progesterone of serum in comparison with the other treatments. Increase in plasma calcium as a consequence of estrogen administration agrees with several previous reports . Bar and Hurwitz reported that estrogen hormones increased intestinal absorption of calcium in laying birds.…”

Section: Discussionsupporting

confidence: 91%

Dietary supplementation of Gracilariopsis persica is associated with some quality related sera and egg yolk parameters in laying quails

Abbaspour

Davood

Mohammadi‐Sangcheshmeh

2014

J Sci Food Agric

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Section: Discussionsupporting

confidence: 91%

Dietary supplementation of Gracilariopsis persica is associated with some quality related sera and egg yolk parameters in laying quails

Abbaspour

Davood

Mohammadi‐Sangcheshmeh

2014

J Sci Food Agric

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“…The parathyroid glands maintain diffusible calcium at normal levels so that estrogen can increase plasma vitellogenin-bound calcium (Polin and Sturkie, 1958;Urist et al, 1960). Circulating estrogen levels and total plasma calcium concentrations tend to be higher in hens producing eggs of 48w specific gravity (Grunder et al, 1983). Therefore, plasma calcium concentrations may reflect differing hormone titers, and protein-bound calcium may not have a significant direct effect on shell quality.…”

Section: Discussionmentioning

confidence: 98%

Percent Shell and Plasma Mineral Concentrations in Three Strains of Domestic Fowl Selected for Thick or Thin Egg Shell Production

Wideman

Buss

1985

Poultry Science

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Percent shell and plasma concentrations of calcium, magnesium, inorganic phosphate, sodium, and potassium were measured in Single Comb White Leghorn, Rhode Island Red, and brown-feathered lines of chickens selected for thick (TK) or thin (TN) egg shell production. Two consecutive generations of TK and TN lines were evaluated for all three strains. Family selection for shell quality characteristics resulted in coselection for plasma calcium concentrations. For the TK lines that had significantly higher percent shell values than the TN lines, mean plasma calcium concentrations in the TK lines exceeded mean plasma calcium concentrations of the TN lines. However, total plasma calcium was found to be an inconsistent index of st" -!! qi'"lity fnr individual hens. Strong positive correlations between total plasma calcium and plasma inorganic phosphate concentrations indicate that these two parameters were coregulated in all experimental groups. Apparently, genetic elements involved in determining shell quality characteristics are, directly or indirectly, determinants of plasma calcium and inorganic phosphate concentrations. Plasma magnesium, sodium, and potassium concentrations were not correlated with percent shell. (

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“…In a study in which E2 was injected into hens, serum level of total Ca was increased significantly [36]. Hens with a higher concentration of circulating estrogens had thicker eggshells than hens that produced thinner eggshells [37]. We found that the relationship between concentrations of E2 and Ca was positive and highly significant (Fig.…”

Section: Discussionmentioning

confidence: 63%

Effect of four environmental toxicants on plasma Ca and estradiol 17β and hepatic P450 in laying hens

Chen

Dziuk

Francis

1994

Enviro Toxic and Chemistry

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In a previous study, we found that administration of phenobarbital to laying hens was associated with an increase in content of liver cytochrome P450 and a reduction in concentration of estradiol (E2) in serum Thus, we hypothesized that other xenobiotics such as environmental toxicants that affect P450 might also affect E2 in laying hens In experiment 1, we examined the effect of four environmental pollutants, three of which induce different isoenzymes of P450 and one inhibitor, on circulating E2 and related reproductive functions Aroclor 1254 (PCB), 20 mg/d, dichlorodiphenyltrichloroethane (DDT), 40 mg/d, or benzo[a]pyrene (BZ), 5 mg/d, was administered for 5 d An inhibitor, lead acetate (100 mg in glycerol/salme), was injected for 2 d Controls received corn oil or sodium acetate No significant difference was observed due to administration of lead Treatment with PCB or DDT decreased the concentration of E2 and increased P450 Only PCB significantly decreased plasma total calcium and egg lay Therefore in experiment 2, we determined the dose‐response effect of PCB The PCB was given orally at doses of 0, 5, 10, and 25 mg in corn oil for 5 d The depression of concentrations of E2 was associated with the induction of P450 in a dose dependent manner Egg production and plasma total calcium were reduced by the two highest doses, but eggshell thickness was not different from control in all regimens Plasma E2 and plasma total calcium were negatively cor related with induction of P450 BZ is not a strong inducer of P450 and had no effect on E2 or reproduction, whereas DDT and PCB had a profound effect on P450 with consequent depression of circulating E2 These data indicate that the effects of envi ronmental pollutants on reproduction in birds can be mediated through increased P450, thereby increasing the metabolism of steroid hormones and depressing concentration in circulation

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Plasma Estrogen, Calcium, and Shell Quality in Two Strains of White Leghorns

Cited by 10 publications

References 7 publications

Dietary supplementation of Gracilariopsis persica is associated with some quality related sera and egg yolk parameters in laying quails

Dietary supplementation of Gracilariopsis persica is associated with some quality related sera and egg yolk parameters in laying quails

Percent Shell and Plasma Mineral Concentrations in Three Strains of Domestic Fowl Selected for Thick or Thin Egg Shell Production

Effect of four environmental toxicants on plasma Ca and estradiol 17β and hepatic P450 in laying hens

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