Relationship Between Blood Ionized Calcium Levels and Shell Strength of Eggs Laid by White Leghorn Hens ,

Hamilton, R. M. G.; Grunder, A. A.; Thompson, B. K.; Hollands, K. G.

doi:10.3382/ps.0602380

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…In the present study, ionic Ca, which has been shown to decrease in plasma during egg calcification was not measured (Luck and Scanes, 1979;Nys et al, 1986). However, Hamilton et al (1981) found no relationship between blood ionic or total Ca level and eggshell quality. Joyner et al (1987) also found no difference between young and old laying hens in plasma level of total or ionic Ca and concluded that poor eggshell quality occurring in older hens was not caused by a decrease in ionic Ca in blood.…”

Section: Us Metabolites [J2s-(oh)2dcontrasting

confidence: 75%

Optimal Dietary Level of 1α,25-Dihydroxycholecalciferol for Eggshell Quality in Laying Hens

1990

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The optimal dietary level of 1 alpha,25-dihydroxycholecalciferol [1,25-(OH)2D3] for eggshell quality was established. White Leghorn hens, 59 wk of age, were fed one of eight diets that contained the same basal ingredients, including 3.1% calcium, but different levels (microgram/kg) or forms of calciferol supplements: no calciferol supplement of any form (56 hens); 27.5 (control) or 55.0 micrograms of cholecalciferol (56 hens each); 3, 5, or 7 micrograms of 1,25-(OH)2D3 (28 hens each); 5 micrograms of 24,25-dihydroxycholecalciferol [24,25-(OH)2D3] with 28 hens; 5 micrograms each of 1,25-(OH)2D3 and 24,25-(OH)2D3 (28 hens). All groups were fed the control diet prior to the 21-wk treatment. The group fed 5 micrograms 1,25-(OH)2D3/kg diet ranked first in specific gravity (SG), e.g., 1.081 versus 1.077 for the control group at Week 21 (P less than .05). The group fed 7 micrograms 1,25-(OH)2D3/kg consumed 30% less feed and laid 20% fewer eggs than the control, but shell quality was not affected. The groups receiving no calciferol supplement or receiving only 24,25-(OH)2D3 laid eggs with significantly lower SG than the control after 2 wk of treatment (1.072 or less versus 1.082 at Week 2). The rest of the treatment groups mentioned were comparable to the control in eggshell quality and egg production. Groups fed the combination of 1,25-(OH)2D3 and 24,25-(OH)2D3 per kilogram of feed, or 1,25-(OH)2D3 alone at 5 micrograms/kg, had significantly higher tibial weights relative to the control group. All groups receiving the diets without cholecalciferol supplementation had markedly reduced hatchability. It was concluded that the optimal dietary level of 1,25-(OH)2D3 for improving eggshell quality without affecting egg production was approximately 5 micrograms/kg and the toxic level was 7 micrograms/kg.

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Section: Us Metabolites [J2s-(oh)2dcontrasting

confidence: 75%

Optimal Dietary Level of 1α,25-Dihydroxycholecalciferol for Eggshell Quality in Laying Hens

1990

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“…Various studies with high and low shell strength lines showed that the low lines produced thin and light egg shells compared with the high lines (Hamilton et al, 1981;Saito et al, 1985). Therefore differences may exist between the lines with respect to calcium movement across the uterine wall during shell formation.…”

Section: Introductionmentioning

confidence: 96%

Adenosine Triphosphatase in the Uterus and Duodenum of Chicken Hens During Eggshell Formation

et al. 1989

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Plasma calcium concentration and uterine and duodenal adenosine triphosphatase (ATPase) activities were determined during shell formation for high (H) and low (L) shell strength lines of hens selected from the last of four consecutive generations. The H and L lines were divided into three groups according to shell formation at 0, 15, and 22 h following oviposition. Plasma total calcium was determined from blood samples collected from the common carotid artery. Activity of ATPase was determined in uterine and duodenal mucosa. Shell strength, shell weight, percentage of shell per egg and shell thickness of the H line hens significantly exceeded those of the L line. During shell formation, no significant fluctuation in plasma calcium levels was observed within a line, but overall mean plasma calcium concentrations were higher in the H line than L line. Uterine ATPase activity increased with time after oviposition in both lines, with that of the H line being greater. Duodenal ATPase activity of H line hens remained fairly constant throughout the period, but this value showed fluctuations in the L line hens. It thus appears that laying hens with high and low shell strength may vary in their ability to use calcium for shell formation.

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

1983

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Relationship Between Blood Ionized Calcium Levels and Shell Strength of Eggs Laid by White Leghorn Hens ,

Cited by 4 publications

References 19 publications

Optimal Dietary Level of 1α,25-Dihydroxycholecalciferol for Eggshell Quality in Laying Hens

Optimal Dietary Level of 1α,25-Dihydroxycholecalciferol for Eggshell Quality in Laying Hens

Adenosine Triphosphatase in the Uterus and Duodenum of Chicken Hens During Eggshell Formation

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

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