The Effect of High Dietary Calcium on the Performance of Laying Hens

Harms, R. H.; Waldroup, P. W.

doi:10.3382/ps.0500967

Cited by 18 publications

(11 citation statements)

References 3 publications

(4 reference statements)

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“…1 and Table 6 agree with the findings of Roland et al (1974) and Scott et al (1971). Since SG is a function of shell weight and thickness (Tyler and Geake, 1961), these data also agree with the results of Harms and Waldroup (1971) and Hurwitz and Bar (1971), who reported that hens fed diets containing 2.5% calcium produced eggs with thinner shells or lower shell weight and SW/SA than those receiving 3.75% ormore dietary calcium. Although Antillon et al (1977) found that lowering the level of calcium in the diet adversely affected shell breaking strength, their results agree with those being reported, because SG is correlated with shell breaking strength (Voisey and Hamilton, 1976).…”

Section: *••supporting

confidence: 93%

“…Harms and Waldroup (1971), however, reported that increasing the calcium levels from 2.5 to 3.75% or from 2.5 to 5.0% of the diet had no effect on egg production between 63 and 79 weeks of age. Hurwitz and Bornstein (1966), Roland et al (1974), andScott et al (1971) found that feed intake was higher if the laying diet contained 2 to 2.5% rather than 3% calcium, but their results do not agree with those in Table 5.…”

Section: *••mentioning

confidence: 90%

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Effects of Dietary Calcium Levels During the Brooding, Rearing, and Early Laying Period on Feed Intake, Egg Production, and Shell Quality of White Leghorn Hens

Hamilton¹,

Cipera²

1981

Poultry Science

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The effects of decreasing the calcium (Ca) level of the diet during the growing and early laying period were investigated with Single Comb White Leghorn pullets. In the first experiment, lowering the dietary Ca level from 3.2 to 2.0 or 1.0% between 154 and 182 days of age or to 2.0% between 183 and 211 days influenced egg specific gravity (P<.001) and shell weight at 177 and 205 days but had no effect (P>.05) on subsequent measurements. Dietary Ca level had no effect on feed intake and efficiency, egg production and yield, egg weight, and Haugh units during the laying period from 154 and 439 days. In a second experiment containing chicks from each of four 2-way crosses, three commercial and a control strain, the dietary Ca level was lowered during the rearing (1 to 143 days) and laying (144 to 354 days) period. Mortality was higher and body weight lower (P<.001) for chicks reared on diets containing .51% Ca than those given the control diets containing .78% Ca. In the laying period, egg production, feed intake and efficiency, and egg specific gravity were lower and mortality, Haugh units, and blood spots were higher for pullets given a diet containing 2.2% Ca between 144 and 242 days or 144 and 340 days than for those receiving a 3.2% Ca laying diet. The hens given the 2.2% Ca laying diet previously had received the .51% Ca diets during the rearing period. There were differences (P<.05) among strains for the aforementioned variables, except feed intake and efficiency, but there were few strain X dietary Ca interactions. These results indicate that egg shell quality was only temporarily improved when the dietary Ca was decreased and subsequently increased during the laying period. (

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Section: *••supporting

confidence: 93%

Section: *••mentioning

confidence: 90%

Effects of Dietary Calcium Levels During the Brooding, Rearing, and Early Laying Period on Feed Intake, Egg Production, and Shell Quality of White Leghorn Hens

Hamilton¹,

Cipera²

1981

Poultry Science

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“…Roland et al (1996) reported that calcium deficiency lead to decreased egg production, egg weight, egg specific gravity, feed consumption and bone density and strength. While excess calcium significantly reduced egg production, egg weight, and feed consumption (Harms and Waldroup 1971). Mineral sources such as bone meal, oyster shell, limestone, calcium, phosphate and gypsum are necessary for bone formation and adequate utilization of the feed (NRC 1994 andOmole et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Effect of Dietary Calcium Sources on Laying Hens Performance and Egg Quality.

Ahmed¹,

Atti²,

Elamin³

et al. 2013

J. Anim. Prod. Adv.

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This study was designed to investigate the effect of feeding two different (oystershell and limestone) sources of calcium to layer hens (Bovan) on performance and egg shell quality. The experiment extended for 4 weeks during which 24 Bovan layers at 24 weeks were used. Birds were divided into two groups (12 bird/ treatment) with four replicates in each battery cage. Traits measured were egg production, feed intake, feed conversion ratio,, body weight change, egg weight, egg height, egg diameter, albumen weight, albumen height, yolk weight, shell weight, and shell thickness. Results showed that the source of calcium (oystershell versus limestone) significantly affected (P<0.05) egg production(59.82 Vs 76.19), feed intake(139.53 Vs142.02), feed conversion ratio(4.67 Vs 2.99) and body weight change (-4.67 Vs 8.91). On the other hand, the source of calcium had no significant effect (P<0.05) on egg weight, egg height, egg diameter, albumen weight, yolk weight, shell weight, shell thickness and shell ash. The results suggest that the inclusion of lime stone in layers ration as calcium source is more beneficial than oystershell.

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“…Previously, Roland et al. () suggested decreasing the amount of calcium in the diet of hens significantly reduced egg weight, although Harms and Waldroup () reported additional calcium (5.%) in diets leads to reduction in egg weight. Our results demonstrated that extreme reduction of calcium concentration in diets (T6) could not scale down the egg weight.…”

Section: Resultsmentioning

confidence: 99%

“…Conversely, supplementation of 50% oyster shell along with limestone has increased egg production in broiler breeders and caged laying hens (Ahmad & Balander, ). Roland, Bryant, and Rabon () reported that shortage of calcium leads to a reduction in egg production, while Harms and Waldroup () also demonstrated that extra calcium (5.5%) can negatively affect the egg production of laying hens. In the present study, as noticeable in Table , the percentage of egg production was negatively affected by T6 from week 27 to the end of the experiment.…”

Section: Resultsmentioning

confidence: 99%

Effects of nanocalcium carbonate on egg production performance and plasma calcium of laying hens

Ganjigohari

Ziaei

Ghara

et al. 2017

Animal Physiology Nutrition

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SummaryThis experiment was conducted to evaluate the effects of nanocalcium carbonate (NCC) instead of calcium carbonate (CC) on egg production, egg weight, egg mass, FCR, blood calcium and egg quality characteristics in laying hens. A total of 120 laying hens were used in a 10-weeks trial, from week 23 to 33 of age. Laying hens were randomly assigned to six treatments with four replications, five hens each. The experimental treatments involved replacing 50% of the CC in the diet by decreasing amounts of NCC and were T1 Basal diet (BD) with 8.06% CC; T2 (6.045% of CC as a negative control); T3 (4.03% of CC replaced by 2.015% NCC); T4 (4.03% of CC replaced by 1.01% NCC); T5 (4.03% of CC replaced by 0.252% NCC) and T6 (4.03 of CC replaced with 0.126%NCC).Egg weight was unaffected by dietary treatments (p > .05).However, the egg production percentage and egg mass in T6 were less than that of other treatments (p < .05). The laying hens in the control group had the best average feed conversion ratio (p < .05). Also, the lowest concentration of calcium in hens' blood was recorded for birds fed T6 (p < .05). The best egg shell quality (relative egg shell weight and egg shell weight/surface) was observed in T1 (p < .05).Collectively, our results demonstrated that NCC could replace CC at a lower inclusion level but extreme reduction of calcium concentration in diets (to 1.43% Ca in the T6 group) reduced production performance, egg quality characteristics, Tibia thickness and blood calcium of laying hens. K E Y W O R D Slaying hen, nanocalcium carbonate (NCC), performance, plasma calcium

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The Effect of High Dietary Calcium on the Performance of Laying Hens

Cited by 18 publications

References 3 publications

Effects of Dietary Calcium Levels During the Brooding, Rearing, and Early Laying Period on Feed Intake, Egg Production, and Shell Quality of White Leghorn Hens

Effects of Dietary Calcium Levels During the Brooding, Rearing, and Early Laying Period on Feed Intake, Egg Production, and Shell Quality of White Leghorn Hens

Effect of Dietary Calcium Sources on Laying Hens Performance and Egg Quality.

Effects of nanocalcium carbonate on egg production performance and plasma calcium of laying hens

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