Dietary Calcium and Phosphorus and Variations in Plasma Alkaline Phosphatase Activity in Relationship to Physical Characteristics of Egg Shells

Paul, Harbhajan S.; Snetsinger, D. C.

doi:10.3382/ps.0480241

Cited by 47 publications

(21 citation statements)

References 19 publications

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“…Our finding that plasma Ca reflected dietary Ca substantiates the findings of others (Dumanovsky, 1962;Paul and Snetsinger, 1969) and suggests that the relationship is linear.…”

Section: Resultssupporting

confidence: 92%

“…Increasing dietary P from 4-5 to 14-2 g/kg did not affect plasma Ca, in agreement with the observations of Paul and Snetsinger (1969), however, they also observed that much less P (3-5 g/kg) caused a significant decrease in plasma Ca. This finding suggests an interrelationship between Ca and P during intestinal absorption.…”

Section: Resultssupporting

confidence: 89%

“…Egg specific gravity (SG), which is a measure of shell strength, radius breaking strength and plasma Ca and inorganic P, similarly, might be useful indices of Ca status. Paul and Snetsinger (1969) observed significant interrelationships among some of these variables, however there are no reports of the relationships of radius breaking strength with all of the other variables. Furthermore, radius breaking strength is 634 K. G. REIGHMANN AND J. K. CONNOR highly correlated with bone ash and is directly dependent on Ca in the diet (Rowland etal, 1967).…”

Section: Introductionmentioning

confidence: 57%

“…This eliminated variation due to the process of shell calcification. Definite relationships between oviposition and plasma Ca and alkaline phosphatase have been established Paul and Snetsinger, 1969). Plasma alkaline phosphatase activity is minimal at the time of oviposition, increases to a maximum in the early stages of shell calcification and decreases as bone resorption increases during the later stages of shell calcification.…”

Section: Recording and Measurementsmentioning

confidence: 99%

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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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“…Our finding that plasma Ca reflected dietary Ca substantiates the findings of others (Dumanovsky, 1962;Paul and Snetsinger, 1969) and suggests that the relationship is linear.…”

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 57%

Section: Recording and Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

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

Reichmann

Connor

1977

British Poultry Science

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“…The levels of plasma were significantly high (p<0.05) during the period in which calcification was in progress and decreased to a lower value at less or no calcification stage. This change agreed with some other reports20, 21,22). On the contrary, the phosphorus level of the shell gland fluid was lower significantly (p<0.05) during the active calcification stage or at the 5-15 hour stage after the egg entered the shell gland, and higher value was observed before the beginning of shell formation and at the end stage of calcification, the higher value being almost the same to the initial level of plasma.…”

Section: Resultssupporting

confidence: 92%

Effect of a Shell Gland Irritant on the Secretion Rate, Calcium and Inorganic Phosphorus Levels of the Shell Gland Fluid in the Laying Hen

Ogasawara¹,

利保²,

脩

et al. 1974

Nihon Chikusan Gakkaiho

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Changes in the secretion rate, calcium and inorganic phosphorus concentrations of the shell gland fluid during shell formation were determined in the hen which had a loop of thread in the shell gland and which continued to lay the soft-shelled eggs only (called treated hens). Determinations were also done in the normal laying hen as a control. The secretion rate of the shell gland fluid was lower in the treated hens than in the control. The calcium content in the shell gland fluid of the control was lowest at the first 5 hour stage of shell formation and increased during the active calcification stage. In the treated hens, calcium contents in the fluid were markedly different from those of the control at some stages of shell formation, the pattern of change, however, being similar to controls. Inorganic phosphorus level of the shell gland fluid in normal laying hens fluctuated significantly (P<0.05) during shell formation. The value was observed to be highest at the end of calcification and was lowest when active calcification was in progress. A remarkable phosphorus change in the fluid was also observed in the treated hens in relation to premature oviposition: the level of the fluid became higher just after the premature oviposition than that in the period during which the egg was staying in the shell gland. From these results, it is assumed that the presence of a loop of thread in the shell gland causes the low secretory activity of the shell gland and causes the abnormal composition of the shell gland fluid. The rapid increase of inorganic phosphorus content in the shell gland fluid in the hen with a shell gland irritant may be partly related to the inhibition of shell deposition, and to premature expulsion of the soft-shelled egg.It was demonstrated by several workers1, 2, 3, 4, 5, 6) that a loop of surgical thread placed through the wall of the shell gland resulted in the expulsion of soft-shelled eggs. The mechanisms for this, however, have not been explained up to date except the nervous system may be involved7).In our previous study on the hens with a thread in the shell gland, it was found that, shell weight almost never increased, even when the soft-shelled egg present in the shell gland was made to stay artificially for about 24 hours in it by tying loosely the upper part of the vagina, and that the presence of a loop of a thread in the shell gland wall seemed to bring about the abnormal crystallization of calcite on the shell membrane (unpublished). These results suggest the possibility that the production of the soft-shelled eggs in such treated hens may be partly induced by the inhibition of shell deposition mechanisms: low secretory activity of the shell gland and abnormality of the fluid composition in the shell gland.In normal hens, the secretion rate of the shell gland fluid was influenced by the physiological state of the gland with regard to egg formation8, 9), and calcium content of the fluid was also changed during shell calcification in chicken9, 10, 11) and turkey12) hens. On the ...

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Freezing Egg Products

Cotterill¹

1986

Egg Science and Technology

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Dietary Calcium and Phosphorus and Variations in Plasma Alkaline Phosphatase Activity in Relationship to Physical Characteristics of Egg Shells

Cited by 47 publications

References 19 publications

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

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

Effect of a Shell Gland Irritant on the Secretion Rate, Calcium and Inorganic Phosphorus Levels of the Shell Gland Fluid in the Laying Hen

Freezing Egg Products

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