Effect of a High-Protein High-Potassium Ration on the Mineral Metabolism of Lambs1

Fontenot, J. P.; Miller, R. W.; Whitehair, C. K.; MacVicar, Robert

doi:10.2527/jas1960.191127x

Cited by 28 publications

(9 citation statements)

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“…At the same time they observed reductions in the urinary excretion of Mg and in the level of serum Mg, which fell from 2.5 to 2.0 mg per 100 ml. Similar experiments have been conducted with sheep, and Fontenot, Miller, Whitehair and MacVicar (3) fotmd that rations high in protein and potassium increased the faecal excretion of Mg, which was accompanied by a fall in plasma 118 Mg. Wilson (9) among others, however, failed to induce a fall in the serum Mg level of sheep by feeding urea, or to alter the 'availability' of dietary Mg as reflected by the level of urinary Mg, despite a marked increase in the ammonia content of rumen liquor. Whereas much previous work has been concerned with physical and chemical changes in the rumen, Storry (8) has drawn attention to the binding of Ca and Mg to suspended material in the abomasal digesta, which accompanies increases in pH.…”

Section: Introductionsupporting

confidence: 64%

A Study of the Possible Role of Chelation in the Occurrence of Hypomagnesaemia in Sheep

Ashton¹,

Sinclair²

1965

Grass and Forage Science

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Wethers fitted with permanent rumen cannulae were used in a study of the eflect of various doses of ammonium salts and E.D.T.A. (ethylene-diamine-tetra-acetic acid, disodium salt) on the pH of rumen digesta and the levels of serum calcium and magnesium. Doses of up to 200 g ammonium acetate had little eflect on the pH of rumen contents or on serum Mg levels, but appeared to produce a fall in serum Ca. Ammonium carbonate, however, when given alone or with E.D.T.A., caused a marked increase in the pH of rumen fluid and a temporary fall in the serum Ca level. When given singly, neither ammonium carbonate nor E.D.T.A. significantly aflected the levels of serum Mg which were, however, reduced when these compounds were given together, possibly because the increased pH of rumen contents produced by the ammonium carbonate was conducive to chelation of Mg by the E.D.T.A. High levels of ammonia may occur in rumen liquor after the ingestion of young nitrogen-rich herbage, and it is suggested that chelation of dietary Mg by such compounds as amino acids and peptides, which abound in young herbage, may be a factor concerned in the low 'availability' of this form of Mg.

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Section: Introductionsupporting

confidence: 64%

A Study of the Possible Role of Chelation in the Occurrence of Hypomagnesaemia in Sheep

Ashton¹,

Sinclair²

1965

Grass and Forage Science

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“…In conclusion, the well known decrease of apparent availability of magnesium upon a high potassium intake (Fontenot et al 1960;Suttle & Field, 1967;Stehling, 1971) is restricted to the forestomachs (Tomas & Potter, 1976;Greene et al 1983) and is closely related to the transmural potential difference. This potential difference causes an increased passive influx of magnesium from the serosal side to the rumen thereby decreasing its net rate of absorption (Care et al 1984).…”

Section: Discussionmentioning

confidence: 76%

“…It has been known for several years that an increased oral intake of potassium reduces the apparent availability ofmagnesium in ruminants (Fontenot, Miller, Whitehair & MacVicar, 1960;Stehling, 1971). The reduction of apparent availability is due to a decreased absorption of magnesium in the forestomachs (Tomas & Potter, 1976;Greene, Webb & Fontenot, 1983;Martens & Kiisebieter, 1983); it cannot be explained by an increased endogenous secretion of magnesium (Newton, Fontenot, Tucker & Polan, 1972).…”

Section: Introductionmentioning

confidence: 99%

Effect of Intraruminal Sodium and Potassium Concentrations and of the Transmural Potential Difference on Magnesium Absorption From the Temporarily Isolated Rumen of Sheep

Martens¹,

Blume²

1986

Exp Physiol

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SUMMARYThe net absorption of magnesium from the temporarily isolated and washed reticulo-rumen of sheep has been studied using buffer solutions with different sodium, potassium and chloride concentrations. An increased potassium concentration led to an increased potential difference (p.d.) and a decreased magnesium absorption. The exchange of chloride in the buffer solutions with sulphate (at constant sodium and potassium concentrations) caused a significant increase of the p.d. and again a reduced net magnesium absorption indicating that the p.d. is an important factor associated with decreased net magnesium absorption. The replacement of sodium with lithium (at constant potassium concentrations) did not influence the net magnesium absorption. It is concluded that the low apparent availability of magnesium after an oral load of potassium is mainly caused by the high transmural potential difference across the rumen wall under such feeding conditions. However, the presented data cannot rule out an effect of potassium per se independent of the effect of the p.d.

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“…The influences of K on the absorption ofMg and plasma Mg levels in ruminants has been well documented (Fontenot et al 1960;Suttle & Field 1967;Thomas and Potter 1976) whereas those ofNa have not (Moseley 1980). The K did not alter the concentration of the absorbable Mg associated with a low molecular weight fraction (Fig.…”

Section: Discussionmentioning

confidence: 72%

“…Received 16 March 1988; accepted 7 July 1988 intake decreased the absorption of magnesium (Mg) (Fontenot et al 1960;Suttle & Field 1969;Tomas & Potter 1976) whereas in other investigations researchers have concluded that increases in sodium (Na) intake or a high Na:K ratio in the rumen contents may improve the absorption ofMg (Martens 1983). In other studies, with sheep, it has been reported that increased Na intakes led to increased urinary excretion of Mg and decreased its apparent retention and concentration in plasma (Moseley 1980).…”

Section: Introductionmentioning

confidence: 99%

Effect of varying sodium and potassium intakes on sodium, potassium, and magnesium contents of the ruminoreticulum and apparent absorption of magnesium in non-lactating dairy cattle

Grace¹

1988

New Zealand Journal of Agricultural Research

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The effect of increasing sodium (Na) and potassium (K) intakes (13.2 and 31.2 g Na/day; 109.5,252.5, and 381.5 g K/day) on the salivary Na and K concentrations, and on the amounts and concentrations ofNa, K, and magnesium (Mg) in the ruminoreticulum digesta and in the 100000 g supernatant fraction from the ruminoreticulum, as well as the apparent absorption of Mg, were studied in six non-lactating cows. Within a Na intake, increasing K intake decreased the amount and concentration of Na and increased the amount and concentration ofK in the ruminoreticulum. Within a K intake, increasing the Na intake increased the Na and decreased the K concentrations in the ruminoreticulum digesta. The amount and concentrations of Mg in the ruminoreticulum digesta were not changed by the varying Na and K intakes. The apparent absorption of Mg and the plasma Mg concentrations were decreased when theKortheNaintake was increased, particularly at high K intakes. The Na:K ratio of mixed saliva was found to be highly variable (0.6 -22.5) in the cows and therefore appears to be unsuitable as an index of the Na status of the cow.

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Effect of a High-Protein High-Potassium Ration on the Mineral Metabolism of Lambs1

Cited by 28 publications

References 0 publications

A Study of the Possible Role of Chelation in the Occurrence of Hypomagnesaemia in Sheep

A Study of the Possible Role of Chelation in the Occurrence of Hypomagnesaemia in Sheep

Effect of Intraruminal Sodium and Potassium Concentrations and of the Transmural Potential Difference on Magnesium Absorption From the Temporarily Isolated Rumen of Sheep

Effect of varying sodium and potassium intakes on sodium, potassium, and magnesium contents of the ruminoreticulum and apparent absorption of magnesium in non-lactating dairy cattle

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