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A survey of fat characteristics of lamb with particular reference to the soft fat condition in intensively fed lambs

Published online by Cambridge University Press:  27 March 2009

J. L. L'Estrange  and
T. A. Mulvihill
J. L. L'Estrange
Affiliation:
Department of Agricultural Chemistry, University College, Dublin, Glasnevin, Dublin 9
T. A. Mulvihill
Affiliation:
Department of Agricultural Chemistry, University College, Dublin, Glasnevin, Dublin 9
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Summary

Two surveys, involving 288 lambs, were carried out on the effects of system of production on the melting (slip) point, iodine value, and fatty acid composition of perinephric and subcutaneous carcass fat. The systems studied were:

A, early Spring lambs fattened indoors on concentrates;

B, early Spring lambs off grass;

C, early Summer lambs off grass;

D, Autumn lambs off grass, and

E, Winter hoggets.

The melting point of both perinephric and subcutaneous fat increased progressively during the season from mean values of 41 and 32°C respectively in group A to mean values of 48 and 42°C respectively in group E. Discolouration of the surface fat was associated with the low melting points of group A.

Mean iodine values of both fats decreased progressively from group A to group E and this change was associated with a decrease in levels of oleic and palmitoleic acid and a corresponding increase in the level of stearic acid. In the fat, levels of myristic acid were highest in grass fed lambs while levels of linoleic acid were highest in the concentrate-fed lambs.

Within each group, perinephric fat contained more stearic and less oleic, palmitoleic, palmitic and myristic acid than subcutaneous fat.

Within animals, the levels between perinephric and subcutaneous fat of melting point, iodine value and most of the individual fatty acids were highly correlated.

Within animals also, the melting point of perinephric fat was correlated in decreasing order of significance with stearic acid, oleic acid, iodine value, linoleic acid and palmitoleic acid, while melting point of subcutaneous fat was correlated in decreasing order of significance with stearic acid, oleic acid, palmitoleic acid, iodine value, linoleic acid and total branched-chain fatty acids.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 84 , Issue 2 , April 1975 , pp. 281 - 290
Copyright
Copyright © Cambridge University Press 1975

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References

REFERENCES

British Standard Methods (1958). BS 684 Method of analysis of oils and fats. Determination of the melting point (slip point) of solid fats, pp. 14—15. Determination of iodine value, pp. 74–8. London: British Standards Institution.Google Scholar
Callow, E. H. (1958). Comparative studies of meat. VI. Factors affecting the iodine number of fat from the fatty and muscular tissues of lambs. Journal of Agricultural Science, Cambridge 51, 361—9.CrossRefGoogle Scholar
Cramer, D. A., Barton, R. A., Shorland, F. B. & Czochanska, Z. (1967). A comparison of the effects of white clover (Trifolium repens) and of perennial ryegrass (Lolium perenne) on fat composition and flavour of lamb. Journal of Agricultural Science, Cambridge 69, 367–73.CrossRefGoogle Scholar
Cramer, D. A. & Marchello, J. A. (1964). Seasonal and sex patterns in fat composition of lambs. Journal of Animal Science 23, 1002–10.CrossRefGoogle Scholar
Cramer, D. A., Marchello, J. A. & Sutherland, T. M. (1961). Effect of temperature and shearing on fat characteristics and feed lot performance of lambs. Proceedings American Animal Production, Western Section 12, xxv.Google Scholar
Crouse, J. D., Kemp, J. D., Fox, J. D., Ely, D. G. & Moody, W. G. (1972). Effect of castration, testerone and slaughter weight on fatty acid content of ovine adipose tissue. Journal of Animal Science 34, 384–7.CrossRefGoogle Scholar
Duncan, W. R. H. & Garton, G. A. (1967). The fatty acid composition and intramolecular structure of triglycerides derived from different sites in the body of the sheep. Journal of Science of Food and Agriculture 18, 99–102.CrossRefGoogle ScholarPubMed
Duncan, W. R. H., ørskov, E. R. & Garton, G. A. (1972). Fatty acid composition of lambs fed on barley based diets. Proceedings of the Nutrition Society 31, 19A–20A.Google ScholarPubMed
Duncan, W. R. H., ørskov, E. R. & Garton, G. A. (1974). Effects of different dietary cereals on the occurrence of branched-chain fatty acids in lamb fats. Proceedings of the Nutrition Society 33, 81 A.Google Scholar
Garton, G. A., Howell, F. D. Del. & Duncan, W. R. H. (1972). Influence of dietary volatile fatty acids on the fatty acid composition of lamb triglycerides with special reference to the effect of propionate on the presence of branched-chain compounds. British Journal of Nutrition 23, 409–16.CrossRefGoogle Scholar
Lea, C. H., Swoboda, P. A. T. & Gatherum, D. P. (1970). A chemical study of soft fat in cross-bred pigs. Journal of Agricultural Science, Cambridge 74, 279–8.9CrossRefGoogle Scholar
L'Estrange, J. L. (1973). A condition of soft discoloured fat in lambs. Irish Journal of Agricultural Research 12, supplement p. vii.Google Scholar
Marchello, J. A. & Cramer, D. A. (1963). Variations of ovine fat composition within the carcass. Journal of Animal Science 22, 380–3.CrossRefGoogle Scholar
Miller, G. J., Varnell, T. R. & Rice, R. W. (1967). Fatty acid composition of certain ovine tissues as affected by maintenance level rations of roughage and concentrate. Journal of Animal Science 26, 41–5.CrossRefGoogle Scholar
Molénat, G. & Thériez, M. (1973). Influence du mode d'elevage sur la qualite do carcasse de l'agneau do bergerie. Annales de Zootechnie 22, 279–93.CrossRefGoogle Scholar
Moore, J. H., Christie, W. W., Braude, R. & Mitchell, K. J. (1969). The effect of dietary copper on the fatty acid composition and physical properties of pig adipose tissues. British Journal of Nutrition 23, 281–87.CrossRefGoogle ScholarPubMed
Mulvthill, T. A. & L'Estrange, J. L. (1973). Effect of system of production on the fatty acid composition and melting point of lamb fat. Irish Journal of Agricultural Science 34, supplement pp. v–vi.Google Scholar
Pearce, J. & Chestnutt, D. M. B. (1974). A comparison of the fatty acid composition of adipose tissue from grass-fed and intensively-reared lambs. Proceedings of the Nutrition Society 33, 99 A.Google ScholarPubMed
Schuler, G. A. & Essary, E. O. (1971). Fatty acid composition of lipids from broilers fed saturated and unsaturated fats. Journal of Food Science 36, 431–4.CrossRefGoogle Scholar
Shelton, M., Calhoun, M. C. & Carpenter, Z. L. (1972). The problem of soft oily lamb carcasses. Research Report PR-3025, Texas A and M University, College Station, Texas.Google Scholar
Shorland, F. B., Czochanska, Z., Barton, R. A. & Rae, A. L. (1967). A comparison between the effects of ryegrass and white clover on the iodine value and melting points of some depot fats of sheep. Journal of Agricultural Science, Cambridge 68, 221–5.CrossRefGoogle Scholar
Wahle, K. W. J. & Garton, G. A. (1972). Desaturation of stearic acid by sheep tissue microsomes. Proceedings of the Nutrition Society 31, 110A.Google Scholar