Influence of Calcium in Laying Rations on Shell Quality and Interior Quality of Eggs

Reddy, C. V. C. M.; Sanford, P. E.; Clegg, R. E.

doi:10.3382/ps.0471077

Cited by 18 publications

(18 citation statements)

References 11 publications

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“…Plasma calcium concentration was similar to the average of 20.9 mg.% reported for chickens on diets containing normal calcium levels by Mueller (1959) and Reddy et al (1968), but approximately 8 to 10 mg.% lower than those reported by Arscott et al (1962) and Hurwitz (1964). Call and Call (1974) reported an average total serum calcium concentration of 11.0 mg.% in laying female Coturnix.…”

Section: Resultssupporting

confidence: 80%

Inheritance of Egg Production, Egg Weight, Body Weight and Certain Plasma Constituents in Coturnix

1978

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In females from a randombred line of Coturnix, egg weight and 70 day egg production were estimated to be of moderate (.20 to .40) to high (greater than .40) heritability, but were influenced greatly by maternal and/or nonadditive genetic effects. Estimates of the heritability of body weight at sexual maturity were low (less than .20) from the paternal half-sister correlation, but greater than 1.0 from the maternal half-sister correlation. Plasma concentrations of a lipophosphoprotein complex (LPP) and total calcium were estimated to be of low heritability, while plasma total phosphorus concentration was moderately heritable.Plasma LPP, total calcium and total phosphorus concentrations were positively correlated genetically and phenotypically with each other and negatively correlated genetically with egg production. The phenotypic correlations between the plasma constituents and egg production were not significant. Body weight was negatively correlated genetically with plasma LPP and egg production but positively correlated with plasma total phosphorus. Calculations of correlated responses to selection indicated that selection for decreased plasma LPP concentration might improve egg production without depressing body weight.The average plasma LPP concentration was 11.5 ± .6 mg./ml. Total plasma calcium concentration (19.4 ± .2 mg.%) was similar to that reported for chickens and turkeys, while total plasma phosphorus concentration (799 ± 8 Mg./ml.) was higher than reports for other avian species.Several estimates of the heritability of body weight in Coturnix have been published, while 1 at

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Section: Resultssupporting

confidence: 80%

Inheritance of Egg Production, Egg Weight, Body Weight and Certain Plasma Constituents in Coturnix

1978

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“…Our results support these findings. However other effects of increasing dietary Ca on laying performance have been reported, including decreased egg numbers (Reddy et al, 1968) and food consumption (Hurwitz et al, 1969). Such effects were not observed at high dietary Ca contents in our study, but egg weight was decreased.…”

Section: Resultscontrasting

confidence: 41%

Influence of dietary calcium and phosphorus on metabolism and production in laying hens

Reichmann

Connor

1977

British Poultry Science

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1. The effects of different dietary concentrations of calcium (24 to 56-9 g/kg) and phosphorus (4-5 to 14-2 g/kg) on production and some aspects of metabolism were studied in laying hens. 2. Treatments did not affect egg numbers, food consumption, conversion efficiency of food to egg, bodyweight gain or mortality. 3. Increasing dietary calcium (Ca) significantly increased plasma Ca and inorganic phosphorus (P), breaking strength at the radius and egg specific gravity and significantly decreased plasma alkaline phosphatase and egg weight. 4. Increasing dietary phosphorus increased plasma P and decreased egg specific gravity significantly. 5. Plasma Ca, P and alkaline phosphatase and radius breaking strength were suitable indices of the Ca status of the hens.

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“…Norris et al (1934), Titus et al (1937), Gutowska and Parkhurst (1942), and Berg et al (1944) have suggested dietary calcium requirements which varied between 1.6 and 2.1 percent. Later investigators, Petersen et al (1960), Durham et al (1960), Harms and Waldroup (1961), Balloun and Marion (1962), and Reddy and Sanford (1963) have shown that higher dietary calcium levels (2.75 to 4.60 percent) were more effective in improving egg shell quality. Driggers and Comar (1949) studied the transfer of calcium from the diet to the egg shell using 45 Ca as a tracer.…”

Section: Introductionmentioning

confidence: 94%

Factors Affecting the Transfer of Calcium (45 Ca) from the Hen’s Diet to the Egg Shell

1971

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Influence of Calcium in Laying Rations on Shell Quality and Interior Quality of Eggs

Cited by 18 publications

References 11 publications

Inheritance of Egg Production, Egg Weight, Body Weight and Certain Plasma Constituents in Coturnix

Inheritance of Egg Production, Egg Weight, Body Weight and Certain Plasma Constituents in Coturnix

Influence of dietary calcium and phosphorus on metabolism and production in laying hens

Factors Affecting the Transfer of Calcium (45 Ca) from the Hen’s Diet to the Egg Shell

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