Some thoughts on dietary requirements of macro-elements for ruminants

Ac, Field

doi:10.1079/pns19810042

Cited by 39 publications

(46 citation statements)

References 12 publications

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“…in the rumen (Michell, 1985). Finally, the fact that some sheep excrete an electrolyte predominantly in urine while others excrete it predominantly in faeces is not unique to sodium; a similar phenomenon applies to phosphate (Field, 1981). In addition to genetic factors, the rate of salivary phosphate secretion appears to determine the distribution between urinary and faecal phosphate excretion (Scott, 1989).…”

Section: Discussionmentioning

confidence: 99%

Differences between sheep excreting sodium predominantly in their urine or in their faeces: the effect of changes in sodium intake

Michell¹,

Moss²

1992

Experimental Physiology

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SUMMARYSheep receiving a total of about 31 mmol day-1 (0-5 mmol kg-') of sodium were classified according to the predominant route of sodium excretion; urinary (U) or faecal (F). U sheep had a greater water turnover than F sheep; their intake was 41 % higher and they produced 133 % more urine but there was little difference in faecal water loss. Most faecal sodium was readily exchangeable with water in both groups. When sodium intake was reduced by 80 % (to 6 mmol day-1; 0'1 mmol kg-'), the reduction in total sodium excretion was equally effective in F sheep and U sheep after 48 h and after 2 weeks the overall losses of sodium were smaller in F sheep. On sodium intakes close to requirement (0-1 mmol kg-' or less) the majority of the sheep excreted most of their sodium in faeces and did so on intakes up to 0 5 mmol kg-' day-'.

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Section: Discussionmentioning

confidence: 99%

Differences between sheep excreting sodium predominantly in their urine or in their faeces: the effect of changes in sodium intake

Michell¹,

Moss²

1992

Experimental Physiology

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“…It is well known that within groups of sheep some individuals do show a more marked renal response to phosphate loading than others (Towns et al 1978;Field, 1981;Scott & 458 McLean, 1981). Such individuals usually have higher than normal concentrations of phosphorus in their plasma before infusion.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Intravenous Phosphate Loading on Salivary Phosphorus Secretion, Net Intestinal Phosphorus Absorption and Pathway of Excretion in Sheep Fed Roughage Diets

Scott¹,

McLean

Buchan³

1984

Exp Physiol

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SUMMARYMature sheep fitted with rumen and duodenal cannulae and fed either pelleted hay or grass diets were given supplementary phosphorus by continuous intravenous infusion and the effects on salivary phosphorus secretion, intestinal phosphorus absorption and pathway of excretion were studied. In control periods little phosphorus was excreted in the urine, the faeces being the major pathway for excretion. Infusion of phosphorus increased both urine and faecal phosphorus excretion though in sheep fed the hay diet the urine response was much less marked than in those fed the grass diet. This was not due to differences in plasma phosphate levels but rather to differences in renal tubular reabsorptive efficiency, though the reason for this is at present unclear. Intravenous phosphate loading had little effect on salivary phosphorus secretion, most of the increase in faecal phosphorus excretion being the result of reduced reabsorption within the intestine. The significance of these changes in relation to the control of phosphorus balance in ruminants is discussed.

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“…This decrease in appetite would rather seem to be the result of a metabolic regulation (Henry, Guéguen and Rérat, 1978), although neither transit rate (Field, 1981) nor dilution rate in the rumen (Durand et al, 1983) can be excluded.…”

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confidence: 99%

“…With the control diet (NPNCa), phosphatemia was high and urinary P excretion considerable in one of the 4 sheep, showing that the process of excretion into the intestine, particularly by the saliva, was saturated when there was an excess of absorbed P (Compere, 1967 ;Field, 1981) or that the renal threshold is lower for some animals (Scott and McLean, 1981). Indeed, true P absorption was very high (82.7 %), all the P being supplied by very available dicalcium phosphate.…”

mentioning

confidence: 99%

Utilization of phosphorus and calcium and minimal maintenance requirement for phosphorus in growing sheep fed a low-phosphorus diet

Boxebeld¹,

Guéguen²,

Hannequart³

et al. 1983

Reprod. Nutr. Dévelop.

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Summary. This paper reports the effects of a marginal phosphorus deficiency associated or not with an excess of calcium in 5 lots of 4 growing sheep each fed a semi-purified diet containing cellulose (25-27 %) and urea as the only nitrogen source.In experiment 1, two P-deficient diets (1.2 g/kg DM) poor (LPLCa) or rich (LPHCa) in Ca led to lower phosphatemia, decreased appetite and a negative or zero P balance. The effects of P deficiency were amplified by excess Ca.In experiment 2, two diets containing 1.5 g of P/kg DM and poor (LPLCa) or rich (LPHCa) in Ca were compared to a control diet (NPNCa). The two low-P diets did not produce any evident signs of deficiency and thus permitted minimal endogenous fecal loss of P to be evaluated at 24 mg/kg of live weight/day. This result confirms the figure adopted by INRA (1978) as the minimal maintenance requirement for P in sheep.Introduction.

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Some thoughts on dietary requirements of macro-elements for ruminants

Cited by 39 publications

References 12 publications

Differences between sheep excreting sodium predominantly in their urine or in their faeces: the effect of changes in sodium intake

Differences between sheep excreting sodium predominantly in their urine or in their faeces: the effect of changes in sodium intake

The Effects of Intravenous Phosphate Loading on Salivary Phosphorus Secretion, Net Intestinal Phosphorus Absorption and Pathway of Excretion in Sheep Fed Roughage Diets

Utilization of phosphorus and calcium and minimal maintenance requirement for phosphorus in growing sheep fed a low-phosphorus diet

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