Effect of Level of Dietary Calcium on Broiler-Type Laying Chickens

Mehring, Arnon L.

doi:10.3382/ps.0440240

Cited by 11 publications

(15 citation statements)

References 7 publications

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“…Insufficient dietary Ca causes decreased egg shell strength and thickness in the laying hen (Arscott et al, 1962;Mehring, 1965), and bone depletion, increased bone fragility (Rowland et al, 1968) and decreased egg production can occur (Mehring, 1965). High dietary P contents may also decrease egg production or shell quality, or both (Harms et al, 1965;Taylor, 1965;Connor and Barram, 1972).…”

Section: Introductionmentioning

confidence: 95%

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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Section: Introductionmentioning

confidence: 95%

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

Reichmann

Connor

1977

British Poultry Science

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“…It is known, for example, that variation in the calcium intake will markedly affect egg production (Evans, Carver & Drant, 1944;Morris & Nalbandov, 1958;Hurwitz & Griminger, 1960;Sullivan & Kingan, 1962;Maclntyre, Chancey & Gardiner, 1963;Mehring, 1965;Arends, Miller & Balloun, 1967). Low levels of calcium in the diet can also be used experimentally to control the period during which eggs are laid (Gilbert, 1969(Gilbert, ,1972a(Gilbert, , 1973Blair & Gilbert, 1973;Gilbert & Blair, 1975).…”

Section: Introductionmentioning

confidence: 99%

Follicular growth and atresia in the ovaries of hens (Gallus domesticus) with diminished egg production rates

Waddington¹,

Perry²,

Gilbert³

et al. 1985

Reproduction

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Summary. Diets containing 3\m=.\5,1\ m=.\0and 0\m=.\1% calcium were fed from the age of 42 weeks to individually caged laying hens. Ovaries were examined at 46\p=n-\49and 70 weeks of age for changes in the follicular population corresponding to the lowered egg production rates of birds given calcium-deficient diets (1\m=.\0% and 0\m=.\1%) and older birds given a normal diet (3\m=.\5%).Growth rates of follicles from 3\ m=. \ 5 mm diameter to ovulation were not changed by the level of dietary calcium in 46\p=n-\49-week-oldbirds. The number of atretic small follicles ( \ m=l e\ 8 mm diam.) increased in old and calcium-deprived birds, resulting in lower numbers of viable follicles in the intermediate stages of growth (3\p=n-\8 mm diam.). There was also an increase in the number of small follicles (1\p=n-\2 mm diam.) starting to grow in 70-week-old birds which may have partly compensated for the increased loss by atresia. Birds of all ages on all diets were able to produce large follicles up to ovulable size. The main feature of poor laying birds was a reduction in the ovulation rate due to the loss of large follicles (> 8 mm diam.) by atresia, an event seen rarely in the birds with good laying performance. As atresia is the normal fate of most of the small follicles, the mechanisms controlling atresia in the small follicles and the large follicles appear to be independent.

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“…Whatever the mechanism, under certain circumstances it can break down and lead to a condition resembling, or identical with, " cage-layer-fatigue " (Bell and Siller, 1962). Furthermore, a diet marginally deficient in calcium might reduce egg production (Mehring, 1965;Petersen, 1965) without stopping it completely and the effects might be relatively long-lasting; further research on the fundamental relationship between calcium metabolism and rate of egg production is needed and is being carried out.…”

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confidence: 96%

The effect of a foreign object in the shell gland on egg production of hens on a calcium‐deficient diet

Gilbert

1969

British Poultry Science

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Effect of Level of Dietary Calcium on Broiler-Type Laying Chickens

Cited by 11 publications

References 7 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

Follicular growth and atresia in the ovaries of hens (Gallus domesticus) with diminished egg production rates

The effect of a foreign object in the shell gland on egg production of hens on a calcium‐deficient diet

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