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Effects of dietary deficiencies of energy, protein and calcium on the pregnant ewe. II. Body composition and mineral content of the lamb

Published online by Cambridge University Press:  27 March 2009

A. R. Sykes  and
A. C. Field
A. R. Sykes
Affiliation:
Moredun Research Institute, Edinburgh, EH17 7JH.
A. C. Field
Affiliation:
Moredun Research Institute, Edinburgh, EH17 7JH.
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Summary

The effects of low protein and low Ca intakes during pregnancy on lamb composition and mineral contents have been investigated. Twenty-eight 6½-year-old Blackface ewes were used in a 2 × 2 experiment in which semi-purified diets containing 11·8 and 6·0% crude protein and 1·2 and 0·11 % Ca in the dry matter were offered to maintain constant levels of non-esterified fatty acids (NEFA) and ketone bodies in the plasma, comparable to those found in hill sheep in winter. A further group, control, were fed a conventional diet containing adequate crude protein and Ca to maintain NEFA and ketone body levels typical of well-nourished sheep. The lambs were killed at birth and whole body fat, moisture, nitrogen, Ca, P, Mg, Na and K contents determined. Further data was obtained on the brain, liver and semitendinosus muscle.

Within the context of the experiment the most important factor in determining the mineral content of the lambs was the protein intake of the ewe, mainly due to its effect on lamb body weight. The mean Ca content of lambs from the control ewes was 47·8 g. By comparison that of lambs from the high and low protein groups was reduced by 4·9 and 12·9 g respectively.

Calcium intakes as low as 27 mg/kg ewe body weight/day had no significant effect on lamb birth weight or mineral composition.

The mean concentrations (g/kg) of minerals in the fat-free bodies of the lambs ranged from 12·1 to 14·6 for Ca, 6·6 to 7·4 for P, 0·49 to 006 for Mg and from 1·9 to 1·6 for K in the control and double deficiency groups respectively. It was concluded that these changes in lamb composition could be interpreted according to classical studies on the influence of undernutrition on the relative growth and development of animal tissues.

The livers of the lambs, although significantly reduced in weight by the protein deficiency showed no evidence of being relatively more severely affected than muscle tissue.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 78 , Issue 1 , February 1972 , pp. 119 - 125
Copyright
Copyright © Cambridge University Press 1972

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References

REFERENCES

Agricultural Research Council (1965). The Nutrient Requirements of Farm Livestock. No. 2. Ruminants. London: Agricultural Research Council.Google Scholar
Alexander, G. (1962 a). Temperature regulation in the new-born lamb. V. Summit metabolism. Aust. J. agric. Res. 13, 100–121.CrossRefGoogle Scholar
Alexander, G. (1962 b). Energy metabolism in the starved new-born lamb. Aust. J. agric. Res. 13, 144–64.CrossRefGoogle Scholar
Butterfield, R. M. (1963). Estimation of carcase composition: the anatomical approach. Symposium – Carcase Composition and Appraisal of Meat Animals, ed. Tribe, D. E., C.S.I.R.O.Google Scholar
Dickerson, J. W. T. & McCance, R. A. (1960). Severe undernutrition in growing and adult animals. 3. Avian skeletal muscle. Br. J. Nutr. 14, 331–38.CrossRefGoogle ScholarPubMed
El-Maraghi, N. R. H., Platt, B. S. & Stewart, R. J. C. (1966). The effect of reproduction on the interaction of dietary protein and calcium. Br. J. Nutr. 20, 733–45.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. & Gunn, R. G. (1968). Seasonal changes in the composition and mineral content of the body of hill ewes. J. agric. Sci., Camb. 71, 303–10.CrossRefGoogle Scholar
Grimble, R. F., Sawyer, M. B. & Whitehead, R. G. (1969). Time relationships between the elevation of the serum amino acid ratio and changes in liver composition in malnourished rats. Br. J. Nutr. 23, 879–88.CrossRefGoogle ScholarPubMed
Jagusch, K. T., Norton, B. W. & Walker, D. M. (1970). Body composition studies with the milk-fed lambs. 1. 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
Pálsson, H. (1955). Conformation and body composition. In Progress in the Physiology of Farm Animals (ed. Hammond, ), p. 475. London: Butterworths Scientific Publications.Google Scholar
Robinson, P. (1948). The effect of supermaintenance and submaintenance diets on mature Border Leicester-Cheviot ewes. J. agric. Sci., Camb. 38, 345–53.CrossRefGoogle Scholar
Russel, A. J. F., Doney, J. M. & Reid, R. L. (1967). The use of biochemical parameters in controlling nutritional state in pregnant ewes, and the effect of undernourishment during pregnancy on lamb birthweight. J. agric. Sci., Camb. 68, 351–58.CrossRefGoogle Scholar
Sykes, A. R. & Field, A. C. (1972 a). Effects of dietary deficiencies of energy, protein and calcium on the pregnant ewe. I. Body composition and mineral content of the ewes. J. agric. Sci., Camb. 78, 109–117.CrossRefGoogle Scholar
Vogel, A. I. (1951). A Text-book of Quantitative Inorganic Analyses: Theory and Practice. London: Longmans, Green.Google Scholar
Wallace, L. R. (1948). The growth of lambs before and after birth in relation to the level of nutrition: III. J. agric. Sci., Camb. 38, 367–401.CrossRefGoogle Scholar
Weniger, J. H., Funk, K. & Konig, K. H. (1955). Untersuchungen über den Calcium-, Phosphor- und Nährstoffgehalt von Schafen und Zeigen. Arch. Tierernähr. 5, 216–24.CrossRefGoogle Scholar