The Effect of Low Phosphorus Rations on Egg Production and Hatchability

O’Rourke, W. F.; Bird, H. R.; Phillips, Paul H.; Cravens, W. W.

doi:10.3382/ps.0331117

Cited by 25 publications

(13 citation statements)

References 3 publications

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“…It would not appear that such small differences could account for the marked difference in results, and it is therefore suggested that some other factor was involved. O'Rourke et al (1954) fed oyster shell ad libitum, and it is entirely possible that excessive calcium consumption depressed the utilization of phosphorus, thereby accentuating the deficiency. The detrimental effect of excess calcium is of increased magnitude when phytin is the principle source of phosphorus, as shown by Krieger and Steenbock (1940) with chicks and Common (1941) with pullets.…”

Section: Resultsmentioning

confidence: 99%

“…Although statistically-significant differences may develop between groups, it is a moot question as to whether or not these differences are due to the experimental variable being tested or to other causes of variability within the experimental population, since differences of similar magnitude frequently develop when the same number of pens are given a single treatment. The experiments of Crowley et al (1961), O'Rourke et al (1954, 1955, Gillis et al (1953), and Miller and Bearse (1934) may be criticized on this point.…”

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confidence: 91%

“…Egg production approximated 65 to 70% over a 35-week period. O'Rourke et al (1954) fed a semipurified ration containing 0.19% phosphorus to pullets in cages, and within three weeks observed a precipitous drop in both egg production and hatchability. Increasing the total phosphorus level to 0.30%, of which approximately 0.18% was nonphytin, restored both to normal.…”

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confidence: 99%

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Phosphorus in the Nutrition of the Adult Hen

Singsen¹,

Spandorf²,

Matterson³

et al. 1962

Poultry Science

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T HE phosphorus requirement of the laying hen has been studied by many research workers during" the last thirty years. Results reported during the period 1933 to 1953 appeared to indicate a higher requirement than suggested by several more recent reports, and these apparently divergent findings have stimulated additional research at a number of experiment stations. Because of the divergent results, it appeared desirable to review details of both experimental procedures and diet composition in recent and older studies for possible sources of the discrepancies. Among these details have been rate of egg production, length of experimental period, sources of phosphorus, effect of vitamin D level, calcium level, calcium:phosphorus ratios, total feed intake (net phosphorus intake), digestibility of the diet, whether the birds were housed on litter or wire floors, and adequacy of bird numbers and replication such that the results reported were reliable. Although several of these factors have been carefully considered by most workers, concurrent failure to consider others may have permitted conclusions which are of limited value.During egg production, the hen's need

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Section: Resultsmentioning

confidence: 99%

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confidence: 91%

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confidence: 99%

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Phosphorus in the Nutrition of the Adult Hen

Singsen¹,

Spandorf²,

Matterson³

et al. 1962

Poultry Science

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“…Deobald et al (1936) reported that egg production had virtually ceased by the fourteenth day after the removal of calcium supplement. O'Rourke et al (1954) stated that a ration containing 0.19 percent phosphorus did not support hatchability and egg production. Patterson et al (1960) obtained a slight but consistent detrimental effect on egg production and shell strength by feeding a low-calcium diet for five days to laying birds.…”

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confidence: 97%

The Effect of Feeding Various Levels of Calcium and Phosphorus on the Performance and Absorption of Chlortetracyline of Caged Layers

et al. 1962

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“…Mitchell and McClure (1937) and Mitchell (1947) showed that the phosphorus requirement of growing chicks decreased with age. O'Rourke et al (1954) reported that the phosphorus requirement of laying hens was somewhat lower than that of growing chicks and not more than .30% phosphorus was required by laying pullets for normal rates of production of viable eggs.…”

mentioning

confidence: 97%