The Endogenous Metabolism of Hens and Capons

Ackerson, C. W.; Blish, M. J.; Mussehl, F. E.

doi:10.3382/ps.0020189

Cited by 12 publications

(4 citation statements)

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“…Moreover, the excretion decreased from one experiment to the next, which is in agreement with the finding of Ackerson et al (1923) that endogenous nitrogen per kilogram of body weight decreased with age; however, it seems probable that bird weight rather than age was the causative factor. Shannon and Brown (1969) presented data supporting this interpretation.…”

Section: The Regression Coefficients Contained Insupporting

confidence: 89%

Metabolic Plus Endogenous Energy and Nitrogen Losses of Adult Cockerels: The Correction Used in the Bioassay for True Metabolizable Energy

Sibbald

1981

Poultry Science

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Three experiments were made with adult White Leghorn cockerels to measure the effect of indigestible organic matter on the metabolic fecal and endogenous urinary energy and nitrogen losses. When a cellulose:carboxymethyl cellulose mixture was placed in the crops of fasted birds the energy excreted during the subsequent 24 and 48 hr was greater than, but proportional to, the energy input. The linear regression coefficients were not different (P>.05) from unity, indicating that the metabolic and endogenous energy output neither increased nor decreased when cellulose was administered. This finding was confirmed when graded levels of sawdust were fed in place of the cellulose. It is concluded that the use of a fasted bird to measure the metabolic and endogenous energy loss, as in the bioassay for true metabolizable energy, is valid and the changes induced by the nature or quantity of dietary fiber are insignificant.Nitrogen excretion was not affected by the feeding of cellulose or sawdust. Excretion increased with the duration of starvation but the difference diminished as the birds aged and became heavier. Nitrogen losses varied greatly among birds but tended to be characteristic of a bird within an experiment.(

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Section: The Regression Coefficients Contained Insupporting

confidence: 89%

Metabolic Plus Endogenous Energy and Nitrogen Losses of Adult Cockerels: The Correction Used in the Bioassay for True Metabolizable Energy

Sibbald

1981

Poultry Science

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“…In a previous article the writers (1) reported a preliminary study of the endogenous metabolism of hens and capons, and outlined a method of studying the utilization of various pro teins by poultry. The purpose of the present investigation was to establish a figure representative of the average endogenous nitrogen excretion of mature Rhode Island Red hens.…”

Section: (Received For Publication 2-1-26)mentioning

confidence: 99%

“…EXPERIMENTAL· This study was handled in the manner previously reported in detail (1). The hens used for the experimental work were mature Rhode Island Reds, the majority being from one to two 1922 1922 1922 1922 1922 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1923 1925 1925 1923 1923 1923 1923 1923 1923 1923 1923 1923 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 1925 60 trials years old, although three of the birds Λvere three years of age when their final figures were obtained.…”

Section: (Received For Publication 2-1-26)mentioning

confidence: 99%

The Endogenous Nitrogen of Hens as Affected by Molting

1926

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“…These birds had been reared on free range and subsequently kept semi-intensively on a good laying ration. 1 The cost of this investigation was met from a grant made to the University of Leeds by Sir Philip Eeokitt. …”

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The nitrogen balance of laying hens

Willcox

1934

J. Agric. Sci.

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With Two Text-figures.) INVESTIGATIONS concerning the protein nutrition of poultry appear mainly to have taken the form of feeding experiments in which growth or egg production have been compared on diets differing in the quality and quantity of protein which they contain. In view of the importance of protein in poultry nutrition, it is surprising that few accurately controlled nitrogen balance experiments are reported in the literature.Ackerson, Blish and Mussehl(i,2) in America have measured the •endogenous loss of nitrogen by poultry by means of the balance experiment, and in this country Hainan (3) has reported the results of balance experiments carried out with laying and non-laying pullets. Hainan determined weekly nitrogen, calcium and phosphorus balances with two birds whose food intake was controlled. He found that both birds remained in positive nitrogen balance during the greater part of the fourteen weeks of the experiment, serious negative balances occurring only during the latter weeks when the birds were laying. His results indicate a marked storage of nitrogen during the week prior to the commencement of laying, this storage being maintained during the early ••stages of laying and falling off towards the end of the laying period. Hainan concluded that preliminary storage of nitrogen for egg production does not extend beyond a week or so prior to the commencement of •egg laying, and that the nitrogen required for the purpose can be largely if not entirely supplied from the food given during the egg laying period.The experiment here to be described was undertaken with a view to studying any variation which might occur in the daily retention of nitrogen by laying birds and in order to arrive at an estimate of the nitrogen requirement for egg production.EXPERIMENTAL. The birds used.Two Rhode Island Red hens, which were in full lay, were selected for the purpose of the experiment. These birds had been reared on free range and subsequently kept semi-intensively on a good laying ration. 1 The cost of this investigation was met from a grant made to the University of Leeds by Sir Philip Eeokitt.

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The Endogenous Metabolism of Hens and Capons

Cited by 12 publications

References 0 publications

Metabolic Plus Endogenous Energy and Nitrogen Losses of Adult Cockerels: The Correction Used in the Bioassay for True Metabolizable Energy

Metabolic Plus Endogenous Energy and Nitrogen Losses of Adult Cockerels: The Correction Used in the Bioassay for True Metabolizable Energy

The Endogenous Nitrogen of Hens as Affected by Molting

The nitrogen balance of laying hens

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