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Faecal endogenous loss of calcium in young sheep

Published online by Cambridge University Press:  09 March 2007

J. S. Chrisp ,
A. R. Sykes  and
N. D. Grace
J. S. Chrisp
Affiliation:
Department of Animal Science, Lincoln College, University of Canterbury, New Zealand
A. R. Sykes
Affiliation:
Department of Animal Science, Lincoln College, University of Canterbury, New Zealand
N. D. Grace
Affiliation:
Biotechnology Division, Department of Scientific and Industrial Research, Private Bag, Palmerston North, New Zealand
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Abstract

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1. Two groups of eight 6–7-month-old wether lambs were offered either a frozen ryegrass (Lolium perenne L.)-white clover (Trifolium repens L.) pasture or a ryegrass-white clover hay, containing 12.1 and 6.4 g calcium/ kg dry matter (DM) respectively. Within groups the amounts offered to individual sheep ranged from 0.5 to 2.0 times the estimated maintenance energy requirements.

2. A single intravenous injection of 150 μCi 45Ca as CaCl2. 2H2O, and stable balances were used to determine absorption, faecal endogenous loss and balance of Ca.

3. Faecal endogenous loss of Ca increased by 1.2 mg/kg body-weight (W) per d with each g/kg W per d increase in DM intake regardless of the diet. At any DM intake the mean faecal endogenous loss was 5.5 mg/kg W per d higher in the sheep offered the frozen herbage diet when compared with those on the hay diet. At any Ca intake the mean faecal endogenous loss was 6.9 mg/kg W higher in sheep offered the hay diet compared with those on the frozen herbage.

4. At feeding levels of about 1.5–2 times the estimated maintenance energy requirement the observed faecal endogenous loss of Ca ranged from 35 to 50 mg/kg W per d, which is two- to threefold greater than the present estimate of the Agricultural Research Council (1980) of 16 mg/kg W per d.

5. A simple model to explain the variation in faecal endogenous loss of Ca between the present study with young sheep and that with lactating ewes (Chrisp et al. 1989) also offered herbage diets is developed, which incorporates the concept of a true endogenous loss related to DM intake and a net endogenous loss reflecting the extent of re-absorption of Ca endogenous losses within the gastrointestinal tract.

Type
Mineral Metabolism
Information
British Journal of Nutrition , Volume 61 , Issue 1 , January 1989 , pp. 59 - 65
Copyright
Copyright © The Nutrition Society 1989

References

Agricultural Research Council (1980). The Nutrient Requirements of Ruminant Livestock. Slough: Commonwealth Agricultural Bureaux.Google Scholar
Ben-Ghedalia, D., Tagari, H., Zamwel, S. & Bondi, A. (1975). Solubility and net exchange of calcium, magnesium and phosphorus in digesta flowing along the gut of sheep. British Journal of Nutrition 33, 87–94.CrossRefGoogle Scholar
Bown, M. D. (1986). Protein metabolism in parasite infected lambs. PhD Thesis, University of Canterbury, New Zealand.Google Scholar
Braithwaite, G. D. (1978). Adaptations in the calcium and phosphorus metabolism of sheep in response to an intravenous infusion of Ca. British Journal of Nutrition 40, 17–21.CrossRefGoogle Scholar
Braithwaite, G. D. (1982). Endogenous faecal loss of calcium by ruminants. Journal of Agricultural Science, Cambridge 99, 355–358.CrossRefGoogle Scholar
Chrisp., J. S., Sykes, A. R. & Grace, N. D. (1989). Kinetic aspects of calcium metabolism in lactating sheep offered herbages with different Ca concentrations and the effect of protein supplementation. British Journal of Nutrition 61, 45–58.CrossRefGoogle ScholarPubMed
Field, A. C., Woolliams, J. A. & Dingwall, R. A. (1985). The effect of dietary intake of calcium and dry matter on the absorption and excretion of calcium and phosphorus by growing lambs. Journal of Agricultural Science, Cambridge 105, 237–243.CrossRefGoogle Scholar
Grace, N. D., Ulyatt, M. J. & MacRae, J. C. (1974). Quantitative digestion of fresh herbage by sheep. III. The movement of Mg, Ca, P, K and Na in the digestive tract. Journal of Agricultural Science, Cambridge 82, 321–330.CrossRefGoogle Scholar
Pfeffer, E., Thompson, A. & Armstrong, D. G. (1970). Studies on intestinal digestion in sheep. 3. Net movement of certain inorganic elements in the digestive tract on rations containing different proportions of hay and rolled barley. British Journal of Nutrition 24, 197–204.CrossRefGoogle Scholar