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Effects of age and state of incisor dentition on body composition and lamb production of sheep grazing hill pastures

Published online by Cambridge University Press:  27 March 2009

A. R. Sykes ,
A. C. Field  and
R. G. Gunn
A. R. Sykes
Affiliation:
Moredun Research Institute, Edinburgh, EH 17 7JH
A. C. Field
Affiliation:
Moredun Research Institute, Edinburgh, EH 17 7JH
R. G. Gunn
Affiliation:
Hill Farming Research Organisation, Bush Estate, Midlothian EH26 QPH
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Summary

Fifty-nine Scottish Blackface female sheep were used to measure the effects of age and state of permanent incisor dentition on the loss of body reserves during pregnancy and lactation and on the ability to replenish them during the dry period, while grazing hill pastures. There were 27 6½-year-old sheep (11 with sound mouths and 16 with broken mouths), 16 5½-year-old sheep (with all permanent incisors clipped to gum level) and 16 2½-year-old sheep. Samples of sheep from each group were slaughtered at the beginning of pregnancy and in mid-lactation, and samples of those with broken mouths and of 5½-year-old and 2½-year-old sheep at the end of the subsequent dry period. Carcasses were dissected into soft tissue and skeleton fractions and the changes in chemical composition of the former are presented. The sheep were weighed at approximately monthly intervals; lamb birth weights and growth rates to 6 weeks of age were recorded.

There was no evidence that broken mouth or the clipping of the teeth impaired the ability of sheep to maintain body weight in early pregnancy, but there was evidence that sheep with broken mouths lost most weight in late pregnancy. There was also evidence that sheep with broken mouths may have poor milk yields as judged by the growth rates of their lambs but more data are needed to establish this conclusion.

The young sheep were most able and the sheep with the broken mouths least able to resist catabolism of their soft tissue protein during pregnancy and lactation. The losses amounted to 18, 20, 21 and 30% in the 2½-year-old, 5½-year-old and 6½-year-old sheep with sound mouths and with broken mouths, respectively. The young sheep replaced their protein reserves more rapidly than the sheep with broken mouths. It is suggested that the ability to restore body protein may be related to maturity.

There was evidence for a redistribution of protein in the body of undernourished sheep in mid-lactation. The soft tissues were overhydrated at this time but much of the fluid which accumulates during pregnancy had apparently cleared.

Information

Type
Research Article
Information
The Journal of Agricultural Science , Volume 83 , Issue 1 , August 1974 , pp. 135 - 143
Copyright
Copyright © Cambridge University Press 1974

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References

REFERENCES

Butterfield, R. M. (1966). Effect of nutritional stress and recovery on the body composition of cattle. Research in Veterinary Science 7, 168– 79.CrossRefGoogle ScholarPubMed
Dickerson, J. W. T. & McCance, R. A. (1960). Severe undernutrition in growing and adult animals. 3. Avian skeletal muscle. British Journal of Nutrition 14, 331–8.CrossRefGoogle ScholarPubMed
Eadie, J. (1970). Hill sheep production systems development. 5th Report, Hill Farming Research Organisation, pp. 70–87.Google Scholar
Fell, B. F., Campbell, R. M., Mackie, W. S. & Weeks, T. C. (1972). Changes associated with pregnancy and lactation in some extra-reproductive organs of the ewe. Journal of Agricultural Science, Cambridge 79, 397–407.CrossRefGoogle Scholar
Field, A. C. & Harris, C. J. (1970). Effect of loss of incisors on the excretion of faecal dry matter by grazing sheep. Proceedings of the Nutrition Society 29, 37A–38A.Google Scholar
Field, A. C. & Suttle, N. F. (1966). A method for determining the body composition of sheep based on dissolution of the sheep in nitric acid. Proceedings of the Nutrition Society 25, xxiii–xxiv.Google Scholar
Field, A. C, Suttle, N. F. & Gunn, K. G. (1968). Seasonal changes in the composition and mineral content of the body of hill ewes. Journal of AgriculturalScience, Cambridge 71, 303–10.CrossRefGoogle Scholar
Field, A. C, Sykes, A. R. & Gunn, R. G. (1974). Effects of age and state of incisor dentition on faecal output of dry matter, and of faecal and urinary output of nitrogen and minerals of sheep grazing hill pastures. Journal of Agricidtural Science, Cambridge 83, 151–60.Google Scholar
Gunn, R. G. (1967). Life-time performance of the brooding ewe. 4th Report, Hill Farming Research Organisation, pp. 51–8.Google Scholar
Gunn, R. G. (1970). A note on the effect of broken mouth on the performance of Scottish Blackface Hill ewes. Animal Production 12, 517–20.Google Scholar
Gunn, R. G. & Robinson, J. F. (1963). Lamb mortality in Scottish Hill Flocks. Animal Production 5, 67–76.Google Scholar
Healy, M. J. R. (1968). Multiple regression with a singular matrix. Journal of the Royal Statistical Society C 17 (2), 110–17.Google Scholar
Hytten, F. E. & Leitch, I. (1964). The Physiology of Human Pregnancy. Oxford: Blackwell Scientific Publications.Google Scholar
Peart, J. N. (1970). Factors influencing lactation of hill ewes. 5th Report, Hill Farming Research Organisation, pp. 55–69.Google Scholar
Sykes, A. R. & Field, A. C. (1972). Effects of dietary deficiencies of energy, protein and calcium on the pregnant ewe. I. Body composition and mineral content of the ewes. Journal of Agricidtural Science, Cambridge 78, 109–17.CrossRefGoogle Scholar
Sykes, A. R. & Field, A. C. (1974). Seasonal changes in plasma concentrations of proteins, urea, glucoso, calcium and phosphorus in sheep grazing a hill pasture and their relationship to changes in body composition. Journal of Agricultural Science, Cambridge 83, 161–69.CrossRefGoogle Scholar
Sykes, A. R., Field, A. C. & Gunn, R. G. (1974). Effects of age and state of incisor dentition on the chemical composition of the skeleton of sheep grazing hill pastures. Journal of Agricultural Science, Cambridge 83, 145–50.Google Scholar
Wallace, L. R. (1948). The growth of lambs before and after birth in relation to the level of nutrition. Part III. Journal of Agricultural Science, Cambridge 38, 367–98.Google Scholar
Widdowson, E. M., Dickerson, J. W. T. & McCance, R. A. (1960). Severe undernutrition in growing and adult animals. 4. The impact of severe undernutrition on the chemical composition of the soft tissues of the pig. British Journal of Nutrition 14, 457–71.CrossRefGoogle ScholarPubMed