The Effect of High Dietary Calcium on the Performance of Laying Hens Fed Rations of Varying Energy Levels

Hurwitz, S.; Bornstein, S.

doi:10.3382/ps.0450805

Cited by 17 publications

(8 citation statements)

References 7 publications

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“…Contrary to the findings of Kienholz and McPherron (1964), Mehring (1965), and Hurwitz and Bornstein (1966) the dietary calcium level of 4.5% did not depress feed consumption nor egg weight as compared to the 3.0% calcium diet. In three out of four experiments the hens fed the 1.5% calcium diet consumed less feed than the hens fed the 4.5% calcium diet.…”

Section: Various Calcium Levels For the Laying Hencontrasting

confidence: 96%

Dietary Calcium Levels in Pre-Lay and Lay Diets in Leghorn Pullets

Miller

Sunde

1975

Poultry Science

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Four experiments over a period of four years with 1350 first-year pullets were designed to determine the influence of the calcium and phosphorus levels in the pre-lay diets on the growing birds and on their subsequent performance. Several dietary calcium levels in the lay period were studied, as well as the interaction between the pre-lay and lay diets. During the growing phase the pullets fed 3.0% calcium and 0.4% phosphorus had significantly (P less than 0.05) lower body weight at 20 weeks of age than thep ulletsin the other pre-lay treatments. Feed consumption and feed efficiency were also adversely affected by this treatment, and sexual maturity was significantly (P less than 0.05) delayed. Early lay mortality from this treatment was evident. On the basis of egg production, egg weight, shell deformation and percent poorly shelled eggs (PSE) at point-of-lay, the pre-lay diets did not influence lay performance nor was there an interaction between any combination of pullet and lay diets. As the calcium levels of the lay diets increased, egg production, feed consumption and shell rigidity increased. The 1.5% calcium level did not maintain bone mineralization as compared to the 3.0 and 4.5% calcium levels. It was noted that shell quality on the basis of PSE and deformation does not begin to deteriorate immediately after the onset of production. In fact there is a short period of time where the egg shells improve and then there is a gradual decline in shell rigidity. The layers fed the lay diet containing 1.5% calcium produced eggs weighing an average of 57.4 g. This was significantly (P less than 0.05) lower than the eggs of the 2.3, 3.0 or 4.5% calcium fed groups which produced eggs weighing 59.1, 58.6 and 59.4 g. respectively.

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Section: Various Calcium Levels For the Laying Hencontrasting

confidence: 96%

Dietary Calcium Levels in Pre-Lay and Lay Diets in Leghorn Pullets

Miller

Sunde

1975

Poultry Science

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“…These findings agreed with the report of Harms et al (1961) that levels of calcium in excess of five percent do not significantly influence feed intake of laying hens or performance under the conditions in which their tests were performed. They disagree with the report of Hurwitz and Bornstein (1966) and Hurwitz et al (1969). The hens used by Hurwitz and co-workers consumed considerably more feed than those used by the birds in this experiment and those used by Harms et al (1961).…”

Section: Resultscontrasting

confidence: 80%

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

Harms

Waldroup

1971

Poultry Science

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“…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: *••contrasting

confidence: 51%

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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The Effect of High Dietary Calcium on the Performance of Laying Hens Fed Rations of Varying Energy Levels

Cited by 17 publications

References 7 publications

Dietary Calcium Levels in Pre-Lay and Lay Diets in Leghorn Pullets

Dietary Calcium Levels in Pre-Lay and Lay Diets in Leghorn Pullets

The Effect of High Dietary Calcium on the Performance of Laying 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

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