Dietary Maintenance Requirement of Sodium for Wether Lambs

Devlin, T. J.; Roberts, Wayne

doi:10.2527/jas1963.223648x

Cited by 18 publications

(9 citation statements)

References 7 publications

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“…Furthermore, since the feeding period extended over 30 d, the normal homeostatic mechanisms of the animal would tend to compensate for any reduction in plasma Ca and Mg due to increased ECFV. The effects of increasing dietary Na levels on plasma Na and K levels were also similar to those reported previously (Devlin and Roberts, 1963;Underwood, 1966;Chico et al, 1971) with no significant or consistent changes despite the observed haemodilution. The mechanisms involved in the reduction of plasma Ca and Mg are unclear but, in comparison with the other minerals, the increasing proportional loss of Ca and Mg in the urine of those animals on the higher Na diets suggest that this mode of mineral loss imposed a larger drain on blood Ca and Mg. Tomas et al (1973) observed a reduction in faecal losses of K when sheep drank saline water, but not for Ca, Mg or P. This agrees with previous results (Moseley and Jones, 1974) in which sheep received similar high levels of dietary Na.…”

Section: Discussionsupporting

confidence: 89%

Effects of variation in herbage sodium levels and salt supplementation on the nutritive value of perennial ryegrass for sheep

Moseley

1980

Grass and Forage Science

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Six groups of five 18-month-old wether sheep received a diet of dried grass ad libitum with a pelleted ground barley/oat supplement containing various levels of salt for 30 d. The first group received grass of high Na concentration (7-3 g per kg DM) with no added salt in the supplement, a second group received low sodium grass (4-2 g per kg DM) with no salt additions, and the other four groups received the low sodium grass with varying levels of salt added to the supplement to provide a final dietary Na concentration ranging from 70 to 18 0 g per kg DM.Dry matter (DM) and organic matter (OM) intakes were significantly reduced for groups receiving salt supplementation. The digestibilities of DM and OM were reduced for all groups on the low sodium grass diets compared with the high sodium grass diet, but were not affected by salt supplementation.No consistent changes were observed in the molar proportions of volatile fatty acids in rumen fluid, but N availability and retention were higher for the animals on the high sodium grass diet.The high sodium grass diet gave a better apparent availability and retention of minerals than the low sodium grass diets and, while addition of salt tended to improve the availability of minerals, the urinary loss of minerals increased with salt addition to the diet.There were no changes in plasma Na levels, and plasma K changes were inconsistent. However, plasma Ca concentration was reduced signifi-

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Section: Discussionsupporting

confidence: 89%

Effects of variation in herbage sodium levels and salt supplementation on the nutritive value of perennial ryegrass for sheep

Moseley

1980

Grass and Forage Science

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“…The effect of increasing dietary Na on serum levels of Na and K was essentially similar to those reported by Devlin & Roberts (1963); Underwood (1966) and Chicco et al (1971), with no significant or consistent changes. The serum concentrations of Ca and Mg were, however, significantly depressed following salt supplementation in groups 2, 3 and 4.…”

Section: G Moseley and D I H Jonessupporting

confidence: 81%

“…The changes in apparent availability of minerals between groups are largely non-significant but, except for phosphorus, there is a trend towards increasing availability with increasing dietary sodium. Devlin & Roberts (1963) showed that the nitrogen balance was improved when low Na diets were supplemented with Na, but when the level of Na supplementation increased the nitrogen balance appeared to decrease. This latter indication agrees with the results of the present work in showing a decreasing nitrogen retention with increasing Na intake.…”

Section: G Moseley and D I H Jonesmentioning

confidence: 99%

The effect of sodium chloride supplementation of a sodium adequate hay on digestion, production and mineral nutrition in sheep

Moseley

Jones

1974

J. Agric. Sci.

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Four groups of six 18-month-old wethers were fed a diet of hay ad libitum with a pelleted ground barley supplement for 70 days. The control group received no further dietary supplements and the sodium content (0-46 %) was above that recommended by published standards. Groups 2, 3 and 4 received supplements of sodium chloride, mixed and pelleted with the barley, to provide a final dietary concentration of 1-7, 2-5 and 3-1 % sodium respectively.Dry-matter intake, dry organic-matter intake and digestible organic matter in dry matter (DOMD) were significantly reduced (P < 0-01) at the highest sodium intake. There was a reduction in live-weight gain and efficiency of utilization of digestible organic matter with increasing sodium chloride supplementation, with significant differences (P < 0-05) between the highest and lowest sodium intake groups.There were no consistent or significant changes in the serum concentrations of sodium or potassium following sodium chloride supplementation, but serum calcium and magnesium levels were significantly lowered as a result of sodium chloride supplementation.Sodium chloride supplementation improved the apparent availability of sodium, potassium, magnesium and calcium but reduced that of phosphorus and nitrogen.

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“…Balance data have been reported for rurninants fed potassium-deficient diets. However, the collection periods in these studies ranged from 3 (Devlin and Roberts 1963), to 5 (St. Omer and Roberts 1967) and 6 (Campbell 1964) days, and showed a negative potassium balance during the first period of potassium restriction. Furthermore, Driedger (1966) Packed cell volumes (PCV) were determined on whole blood using the microhematocrit method.…”

Section: Introductionmentioning

confidence: 89%

Potassium and Sodium Balances During Dietary Potassium Restriction in Sheep

Cowan¹,

Phillips²

1973

Can. J. Anim. Sci.

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The inputs and outputs of potassium (K) and sodium (Na) were measured in six lambs prior to and during a 4-day period of acute dietary K restriction. During the predepletion period, urinary K accounted for 60.4% of the total K excreted. Renal K and Na excretion decreased during the initial stage of K restriction. Renal K excretion then continued to decrease and reached a minimum level after 40 h of K restriction, whereas fecal K excretion decreased only moderately from predepletion levels. A transient natriuresis, which occurred concurrently with the minimum level of urinary K, supported the hypothesis of the existence of a renal peritubular Na–K exchange mechanism. The delay in renal K conservation mechanisms, together with an obligatory fecal K excretion, caused an acute K deficit, estimated at 6.7–11.4%, in lambs fed a low K diet (0.032% K) for 4 days.

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Dietary Maintenance Requirement of Sodium for Wether Lambs

Cited by 18 publications

References 7 publications

Effects of variation in herbage sodium levels and salt supplementation on the nutritive value of perennial ryegrass for sheep

Effects of variation in herbage sodium levels and salt supplementation on the nutritive value of perennial ryegrass for sheep

The effect of sodium chloride supplementation of a sodium adequate hay on digestion, production and mineral nutrition in sheep

Potassium and Sodium Balances During Dietary Potassium Restriction in Sheep

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