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Calcium and phosphorus retention by the milk-fed lamb, with estimates of the endogenous losses

Published online by Cambridge University Press:  27 March 2009

D. M. Walker
D. M. Walker
Affiliation:
Department of Animal Husbandry, University of Sydney, Sydney, N.S.W. 2006, Australia
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Abstract

SUMMARY

The total body content of calcium and phosphorus of twenty-seven male cross-bred lambs was determined, after the lambs had suckled ewes at pasture for between 2 and 5d. The relationships between empty body weight and Ca and P content were described by linear regression equations. The comparative slaughter method was used with thirty-seven lambs, and the balance method with twenty lambs, to determine the retention of Ca and P from cow's milk by lambs given intakes of milk ranging from maintenance (or below) to ad lib. The availability of Ca, calculated as true digestibility, was 88–1 %, and for P, 98–2 %. Estimates of net availability, calculated from the slopes of the regressions relating mineral intake to mineral apparently absorbed, were somewhat higher and close to 100%. The net efficiencies of Ca and P retention, as estimated from the slopes of the regressions relating mineral intake to mineral retention, were also close to 100%. The balance method gave higher estimates of Ca and P retention than the comparative slaughter method. Multiple regression equations were used to describe the dependence of P retention on N and Ca retention. A low-calcium diet was given to two lambs for 20 d and the endogenous losses of Ca (and P) in the faeces and urine were determined. The total endogenous losses were 9–5 + 0–9 mg Ca (and 30–3 ± 1–4 mg P) per kg live weight d, of which the urinary losses were 0–5 mg Ca (and 27–9 mg P). Requirements for Ca, calculated for the milk-fed lamb at live weights of 5 and 10 kg, were somewhat lower than those recommended by the Agricultural Research Council (1965), but P requirements were in close agreement.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 79 , Issue 2 , October 1972 , pp. 171 - 179
Copyright
Copyright © Cambridge University Press 1972

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References

Agricultural Research Council (1965). The Nutrient Requirements of Farm Livestock. No. 2. Ruminants. Technical Reviews and Summaries. London: H.M.S.O.Google Scholar
Association Of Official Agricultural Chemists (1960). official Methods of Analysis, 9th ed.Washington: Association of Official Agricultural Chemists.Google Scholar
Allen, R. J. L. (1940). The estimation of phosphorus. Biochem. J. 34, 858–65.CrossRefGoogle ScholarPubMed
Carubelli, R., Smith, W. O. & Hammersten, J. F.(1959). Determination of magnesium and calcium in urine. Clin. chem. 5, 45—9.CrossRefGoogle ScholarPubMed
Duncan, D. L. (1966). In Recent Advances in Animal Nutrition, p. 51 [Abrams, J. T., editor]. London: J. and A. Churchill Ltd.Google Scholar
Faruque, O. & Walker, D. M. (1970). Vitamin A and protein interrelationships in the milk-fed lamb. Br. J. Nutr. 24, 11–22.CrossRefGoogle ScholarPubMed
Field, A. C. & Suttle, N. F. (1967). Retention of calcium, phosphorus, magnesium, sodium and potassium by the developing sheep foetus. J. agric. Sci., Camb. 69, 417–23.CrossRefGoogle Scholar
Field, A. C. & Suttle, N. F. (1969). Some observations on endogenous loss of calcium in the sheep. J. agric. Sci., Camb. 73, 507–9.CrossRefGoogle Scholar
Jagusch, K. T., Norton, B. W. & Walker, D. M. (1970). Body composition studies with the milk-fed lamb. I. Chemical composition and calorific content of the body and organs of newly-born lambs. J. agric. Sci., Camb. 75, 273–7.CrossRefGoogle Scholar
Langlands, J. P. & Sutherland, H. A. M. (1968). An estimate of the nutrients utilized for pregnancy by Merino sheep. Br. J. Nutr. 22, 217–27.CrossRefGoogle ScholarPubMed
Langlands, J. P. & Sutherland, H. A. M. (1969). An estimate of the nutrients utilized for live-weight gain by Merino sheep. Br. J. Nutr. 23, 603–9.CrossRefGoogle ScholarPubMed
Maynard, L. A. & Loosli, J. K. (1969). Animal Nutrition, 6th ed.Toronto: McGraw-Hill Book Co. Inc.Google Scholar
McCance, R. A., Widdowson, E. M. & Shackleton, L. R. B. (1936). The nutritive value of fruits, vegetables and nuts. Spec. Rep. Ser. med. Res. Coun., Lond. no. 213.Google Scholar
Mitchell, H. H. & McClure, F. J. (1937). Mineral nutrition of farm animals. Bull. natn. Res. Coun. Wash. no. 99.Google Scholar
Walker, D. M., Cook, L. J. & Jagusch, K. T. (1967). Nitrogen balance studies with the milk-fed lamb. 5. Effect of frequency of feeding. Br. J. Nutr. 21, 275–87.CrossRefGoogle ScholarPubMed
Walker, D. M. & Faichney, G. J. (1964). Nitrogen balance studies with the milk-fed lamb. 1. Endogenous urinary nitrogen, metabolic faecal nitrogen and basal heat production. Br. J. Nutr. 18, 187–200.CrossRefGoogle ScholarPubMed
Walker, D. M. & Norton, B. W. (1971). Nitrogen balance studies with the milk-fed lamb. 9. Energy and protein requirements for maintenance, liveweight gain and wool growth. Br. J. Nutr. 26, 15–29.CrossRefGoogle ScholarPubMed