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Body composition changes in Scottish Blackface ewes during one annual production cycle

Published online by Cambridge University Press:  18 August 2016

N.R. Lambe ,
M.J. Young ,
S. Brotherstone ,
T. Kvame ,
J. Conington ,
K. Kolstad  and
G. Simm
N.R. Lambe*
Affiliation:
SAC, Hill and Mountain Research Centre, Kirkton Farm, Crianlarich, West Perthshire FK20 8RU, UK
M.J. Young
Affiliation:
Sheep Improvement Ltd, PO Box 66, Lincoln University, Canterbury, New Zealand
S. Brotherstone
Affiliation:
Scottish Agricultural College (SAC), West Mains Road, Edinburgh EH9 3JG, UK
T. Kvame
Affiliation:
Department of Animal Science, Agricultural University of Norway, PO Box 5025, N-1432 Aas, Norway
J. Conington
Affiliation:
Scottish Agricultural College (SAC), West Mains Road, Edinburgh EH9 3JG, UK
K. Kolstad
Affiliation:
Department of Animal Science, Agricultural University of Norway, PO Box 5025, N-1432 Aas, Norway
G. Simm
Affiliation:
Scottish Agricultural College (SAC), West Mains Road, Edinburgh EH9 3JG, UK
*
†E-mail: [email protected]
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Abstract

Tissue depletion and repletion were investigated in 142 Scottish Blackface ewes using computed tomography (CT). Ewes of two ages (2 or 3 years) and differing reproductive status (barren, single- or twin-bearing) were studied through one annual production cycle to investigate mobilization of carcass fat (subcutaneous and inter-muscular), internal fat and muscle.

Ewes were CT scanned five times during the 1-year study period: pre-mating; pre-lambing; mid-lactation; weaning; pre-mating the following year. For each animal at each of the five scanning events cross-sectional CT scans were taken at five anatomical sites (ischium, hip, 5th lumbar vertebra, 2nd lumbar vertebra and 8th thoracic vertebra). CT images were analysed to yield areas of carcass fat, muscle and internal fat and total weights of these tissues were estimated at each scanning event using prediction equations derived from a separate calibration data set.

The results show that both carcass and internal fat depots were depleted during pregnancy and early lactation and repleted from mid-lactation to mating the following year. In proportionate terms, internal fat was most labile, but carcass fat contributed more to total weight change because it was a bigger fat depot. Subcutaneous fat was the largest and most labile of the carcass fat depots. Muscle reserves were depleted only when fat reserves had fallen to very low levels. Older ewes carried more carcass fat in total than younger ewes when reserves were low. Mobilization of tissue reserves in twin-bearing ewes was less than in single-bearing ewes, probably due to preferential feeding.

Keywords

body compositioncomputed tomographyewes.
Type
Growth, development and meat science
Information
Animal Science , Volume 76 , Issue 2 , April 2003 , pp. 211 - 219
Copyright
Copyright © British Society of Animal Science 2003

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References

Armsby, H. P. 1917. The nutrition of farm animals. MacMillan, New York.CrossRefGoogle Scholar
Armstrong, H. M., Gordon, I. J., Grant, S. A., Hutchings, N. J., Milne, J. A. and Sibbald, A. R. 1997. A model of the grazing of hill vegetation by sheep in the UK. I. The prediction of vegetation biomass. Journal of Applied Ecology 34: 166–185.CrossRefGoogle Scholar
Bocquier, F. and Theriez, M. 1984. Prediction of ewe body composition at different physiological states. In In-vivo measurements of body composition in meat animals (ed. Lister, D.), pp. 152–157. Elsevier Applied Science Publications, London.Google Scholar
Conington, J. and Rance, M. 1999. The effects of ewe live weight and body composition on lamb performance: Preliminary results. SAC/Roslin Institute Hill Sheep Project, 14th progress report.Google Scholar
Cowan, R. T., Robinson, J. J., McDonald, I. and Smart, R. 1980. Effects of body fatness at lambing and diet in lactation on body tissue loss, feed intake and milk yield of ewes in early lactation. Journal of Agricultural Science, Cambridge 95: 497–514.CrossRefGoogle Scholar
Gilmour, A. R., Thompson, R., Cullis, B. R. and Welham, S. 1996. ASREML. Biometrics bulletin 3, NSW Agriculture.Google Scholar
Glasbey, C. A. and Robinson, C. D. 2002. Estimators of tissue proportions from X-ray CT images. Biometrics 58: 928–936.CrossRefGoogle ScholarPubMed
Gunn, R. G. and Doney, J. M. 1975. The interaction of nutrition and body composition at mating on ovulation rate and early embryo mortality in Scottish Blackface ewes. Journal of Agricultural Science, Cambridge 85: 465–470.CrossRefGoogle Scholar
Hodgson, J. and Grant, S. A. 1981. Grazing animals and forage resources in the hills and uplands. In The effective use of forage and animal resources in the hills and upland (ed. Frame, J.), proceedings of a British Grassland Society symposium, 2-4 September, 1980, Heriot-Watt University, pp. 41–57. British Grassland Society, Maidenhead.Google Scholar
Jopson, N. B., Kolstad, K. and Vangen, O. 1994. In search of genetic variation in biological components of efficiency: examples from various species. Proceedings of the 45th annual meeting of the European Association for Animal Production, Edinburgh, Scotland, p. 141.Google Scholar
Lambe, N. R., Young, M. J., McLean, K. A., Conington, J. and Simm, G. 2003. Prediction of total body tissue weights in Scottish Blackface ewes using CT scanning. Animal Science 76: 191–197.CrossRefGoogle Scholar
Lane, P. W. and Payne, R. W. 1996. GENSTAT for Windows: an introductory course, second edition. Lawes Agricultural Trust, Rothamsted, Harpenden.Google Scholar
Mitchell, B., McCowan, D. and Nicholson, I. A. 1976. Annual cycles of body weight and condition in Scottish red deer, Cervus elaphus. Journal of Zoology, London 180: 107–127.CrossRefGoogle Scholar
Peart, J. N. 1968. Some effects of live weight and body condition on the milk production of Blackface ewes. Journal of Agricultural Science, Cambridge 70: 331–338.CrossRefGoogle Scholar
Riney, T. 1955. Evaluating condition of free-ranging red deer (Cervus elaphus), with special reference to New Zealand. New Zealand Journal of Science and Technology 36(B): 429–463.Google Scholar
Robinson, J. J. 1987. Energy and protein requirements of the ewe. Proceedings of the Nottingham feed manufacturers’ conference, January 1987.Google Scholar
Russel, A. J. F., Gunn, R. G. and Doney, J. M. 1968. Components of weight loss in pregnant hill ewes during winter. Animal Production 10: 41–53.CrossRefGoogle Scholar
Wright, I. A. and Russel, A. J. F. 1984. Partition of fat, body composition and body condition score in mature cows. Animal Production 38: 23–32.Google Scholar