The phosphorus requirements for growth and maintenance of sheep

Field, A. C.; Coop, R.L.; Dingwall, R; Munro, C. S.

doi:10.1017/s0021859600030070

Cited by 22 publications

(23 citation statements)

References 11 publications

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“…On this type of diet phosphorus repletion after nitrogen and phosphorus deficiency was also analysed Quantitative aspects of phosphorus metabolism 257 [18]. In sheep, 100%-forage diets were given in order to determine the availability of phosphorus in forages [38,39], maintenance phosphorus requirements [40,41] and the phosphorus metabolism [29,[42][43][44][45][46][47][48][49]. [50] used 100% chopped hay diet for the determination of net intestinal exchange of ions.…”

Section: Experimental Diets (Tab Iv)mentioning

confidence: 99%

“…Diets with concentrates were only given for the determination of phosphorus requirements for growth [40,53] and in a study of phosphorus metabolism in milk-fed lambs [19]. Pure concentrate diets were also given to lambs for the evaluation of various phosphorus sources [51,54], in another study of phosphorus metabolism [55,56], for the determination of the availability of phosphorus in different feedstuffs [38,57], and for studies of phosphorus excretion [45,58] and phosphorus metabolism [59].…”

Section: Experimental Diets (Tab Iv)mentioning

confidence: 99%

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I. A bibliographic database for quantitative analysisof phosphorus flow in ruminants

Bravo

Sauvant

Bogaert³

et al. 2003

Reprod. Nutr. Dev.

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-The present study describes a quantitative analysis of phosphorus metabolism in ruminants. The database compiles 100 sources either published (95) or unpublished (5) involving studies on true or apparent phosphorus balances carried out before 1999. The database reports 652 distinct experimental conditions (lines) described with experimental variables (column) involving a total of 2 982 animals: 414 lambs (33 references), 1 078 sheep (37 references), 64 pregnant ewes (3 references), 212 lactating ewes (5 references), 528 calves (20 references), 4 maintenance cows (1 reference), 519 lactating cows (6 references), 42 kids (1 reference) and 121 lactating goats (3 references). The reliability of the database was tested using some general relationships.metabolism / phosphorus / quantitative aspect / ruminant

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Section: Experimental Diets (Tab Iv)mentioning

confidence: 99%

Section: Experimental Diets (Tab Iv)mentioning

confidence: 99%

I. A bibliographic database for quantitative analysisof phosphorus flow in ruminants

Bravo

Sauvant

Bogaert³

et al. 2003

Reprod. Nutr. Dev.

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“…On the other hand, several scientists have measured true P absorption while estimating endogenous P faecal excretion by the isotopic dilution method (Kleiber et al, 1951 ;Gu6guen, 1962 ;Compere, 1966 ;Field, Munro and Suttle, 1977 ;Field et al, 1982 ;Braithwaite, 19811. This method is based on the assumption that P secreted into the intestinal content has the same specific radioactivity as the P of the blood plasma.…”

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confidence: 99%

Intestinal absorption and secretion of total and lipid phosphorus in adult sheep fed chopped meadow hay

Thewis¹,

François²

1985

Reprod. Nutr. Dévelop.

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Summary. The flow of total (P T ) and lipid (Pp d phosphorus was measured in adult sheep fed meadow hay and fitted with Ivan-Johnston reentrant cannulas in the duodenum (just posterior to the entry of the common bile and pancreatic duct) and in the terminal ileum.The pattern of plasma, duodenal and ileal P T and P PL specific radioactivity was also studied.The considerable total and lipid P secretion observed between the mouth and the duodenal cannula could be accounted for by salivary and biliary secretions, respectively. This secretion was followed by high absorption in the small intestine and less in the large intestine.A comparison of P specific radioactivities showed that the selective P PL reabsorption occurring in the small intestine could be due to the existence of an entero-hepatic cycle of biliary phospholipids.Introduction.

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“…Table 1. Each one consisted of a balance trial in which the fraction of P of endogenous origin in faeces was derived by the method of radioisotope dilution (Field et al 1982). Faeces were collected daily for 8-16 days depending upon the experiment.…”

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confidence: 99%

Maintenance requirements of phosphorus and absorbability of dietary phosphorus in sheep

Field

1983

J. Agric. Sci.

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The factorial approach to the determination of the dietary requirements of macroelements is a two-stage process; in the first the net requirements are estimated and in the second, the fractional absorption of the dietary mineral is used to convert net to dietary requirements (Agricultural Research Council, 1965). At the first stage the maintenance component is allotted a fixed value, so that estimated dietary requirements are directly proportional to absorbability of the element.This may not be the case with P, however, since substantial quantities of P are secreted in saliva and remain available to the animal by reabsorption from the gut. Because of this recycling, maintenance requirements will therefore vary inversely according to the efficiency with which endogenous P is reabsorbed. Since endogenous and dietary P are absorbed from the same pool in the gut at efficiencies which are closely related (Field, 1981), it should be possible to show a similar and more practically useful inverse relationship between maintenance requirement and absorbability of dietary P. Such a relationship would enable a more accurate prediction of dietary requirement for sheep which absorb dietary P with different efficiencies by making allowance for the effect of recycling on maintenance requirement.Recent studies on the P metabolism of sheep in which the P intake approximated to the needs of the animal have provided data on which to investigate the relationship between minimum endogenous faecal losses and the absorbability of dietary P. MATERIALS AND METHODSData on endogenous faecal excretion and the fractional absorption of dietary P come from a study on the P requirements for growth and maintenance (Expts 1 and 2; Field et al. 1982) and one on the effect of calcium and P intake on the absorbability of dietary P in lambs (A. C. Field and J. Kamphues, unpublished). Table 1. Each one consisted of a balance trial in which the fraction of P of endogenous origin in faeces was derived by the method of radioisotope dilution (Field et al. 1982). Faeces were collected daily for 8-16 days depending upon the experiment. The methods for the determination of stable and radioactive P were those used by Field et al. (1982). Details of the experiments are summarized inLinear regressions were fitted to the data on endogenous faecal excretion and fractional absorption of dietary P from the individual experiments. Tests for differences between slopes and between adjusted means given equal slopes of the regression were performed between experiments. Analysis of variance was used elsewhere. RESULTSThe results are summarized in Table 2. The P intake of the sheep ranged from 1 to 1-5 g/day in the experiments: quantities considered adequate for maintenance in these ages of sheep by Agricultural Research Council (1980) but not by Institut National de la Recherche Agronomique (1978). Plasma P concentrations were similar in all groups and within the normal range (Doxey, 1977). Despite the low P intakes some sheep in Expts 1 and 3 excreted P in their urine (0...

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The phosphorus requirements for growth and maintenance of sheep

Cited by 22 publications

References 11 publications

I. A bibliographic database for quantitative analysisof phosphorus flow in ruminants

I. A bibliographic database for quantitative analysisof phosphorus flow in ruminants

Intestinal absorption and secretion of total and lipid phosphorus in adult sheep fed chopped meadow hay

Maintenance requirements of phosphorus and absorbability of dietary phosphorus in sheep

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