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

Gilbert, A. B.

doi:10.1080/00071666908415744

Cited by 15 publications

(13 citation statements)

References 10 publications

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“…Artificial light was provided from 06.00 to 18.00 h. The hens had access ad libitum to a low-calcium mash (Gilbert, 1969), to calcium grit (crushed cockle-shell) and to water. Food and calcium intakes were measured at 09.00 h and then hourly.…”

Section: Methodsmentioning

confidence: 99%

A girgadian rhythm of calcium intake in the domestic fowl

Hughes

1972

British Poultry Science

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Observations on the food and calcium intake of six laying hens indicate that when the opportunity is provided, the fowl can control these parameters independently. The results suggest that calcium intake is regulated on an hour-to-hour basis by the needs of egg formation and anticipates maximal calcium requirement. Detailed records obtained from a single bird in a Skinner box suggest that calcium intake is controlled by a response to ovulation. This could be either a hormonal or a neural response.

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Section: Methodsmentioning

confidence: 99%

A girgadian rhythm of calcium intake in the domestic fowl

Hughes

1972

British Poultry Science

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“…B. GILBERT, J. PEDDIE, G. G. MITCHELL AND P. W. TEAGUE a complete cessation of egg production (Gilbert, 1969;1973;Gilbert and Blair, 1975). Clearly central mechanisms involving the pituitary operate at such low calcium concentrations because hens which would normally stop laying on such diets can be forced to continue laying if given gonadotrophins (Taylor et al, 1962).…”

Section: Introductionmentioning

confidence: 96%

The egg‐laying response of the domestic hen to variation in dietary calcium

Gilbert

Peddie

Mitchell

et al. 1981

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). Furthermore, the number of eggs produced when birds are fed a low-calcium diet is proportional to the amount of calcium in the diet (Gilbert, Peddie, Mitchell & Teague, 1981a).…”

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

Cited by 15 publications

References 10 publications

A girgadian rhythm of calcium intake in the domestic fowl

A girgadian rhythm of calcium intake in the domestic fowl

The egg‐laying response of the domestic hen to variation in dietary calcium

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

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