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Longitudinal studies of body composition during growth in male, female and castrate male sheep of two breeds with different wool growing capabilities

Published online by Cambridge University Press:  27 March 2009

T. W. Searle ,
N. McC. Graham ,
D. A. Griffiths  and
D. E. Margan
T. W. Searle
Affiliation:
Division of Animal Production, G.S.I.R.O., P.O. Box 239, Blacktown, 2148 New South Wales, Australia
N. McC. Graham
Affiliation:
Division of Animal Production, G.S.I.R.O., P.O. Box 239, Blacktown, 2148 New South Wales, Australia
D. A. Griffiths
Affiliation:
Division of Animal Production, G.S.I.R.O., P.O. Box 239, Blacktown, 2148 New South Wales, Australia University of Wollongong, P.O. Box 1144, Wollongong 2500, Australia
D. E. Margan
Affiliation:
Division of Animal Production, G.S.I.R.O., P.O. Box 239, Blacktown, 2148 New South Wales, Australia
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Summary

Dorset Horn and Corriedale ewes (breeds with low and high wool growing capabilities respectively) with single lambs were fed ad libitum on a pelleted roughage-concentrate diet. Following weaning at 6–7 weeks of age (live weight (LW) ca. 15 kg), ten entire male, ten female and ten castrate male lambs of each breed were housed in single pens and fed the same diet ad libitum. Body composition (fat, protein, water, ash and energy) was estimated from tritiated water space at 5 kg LW increments from 10 to 55 kg. Fleece weight was also estimated on each occasion.

The relationship between the weight of body components and fleece-free fasted live weight (W) for each sheep was described by a two-phase piecewise linear model, the slope in each phase representing the average composition of weight gain. In the first phase, the composition of weight gain did not differ between breeds and contained similar amounts of fat and protein (14%), 66% water and 5% ash. Within breeds females tended to be fattest. There were significant differences due to breed and sex in all body components in the second (fattening) phase. The fat content of gain was lower in Dorset Horn ewes and wethers (45 and 51% respectively) than in corresponding Corriedales (64 and 58%) with the males being even lower (44 and 41% respectively). Dorset Horns entered the fattening phase at a significantly higher W (26 kg) than Corriedales (23 kg), there being no sex difference within breeds. The combined effect of lower slope and higher weight at the commencement of the phase change in the Dorset Horns was to produce a considerable breed difference in fatness in the second phase of growth in ewes and wethers. Possible physiological reasons for the differences are discussed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 110 , Issue 2 , April 1988 , pp. 239 - 247
Copyright
Copyright © Cambridge University Press 1988

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References

Agricultural Research Council (1980). The Nutrient Requirements of Ruminant Livestock. Farnham Royal, U.K.: Commonwealth Agricultural Bureaux.Google Scholar
Blaxter, K. L., Fowler, V. R. & Gill, J. C. (1982). A study of the growth of sheep to maturity. Journal of Agricultural Science, Cambridge 98, 405–420.CrossRefGoogle Scholar
Butterfield, R. M., Zamora, J., Thompson, J. M., Reddacliff, K. J. & Griffiths, D. A. (1984). Changes in body composition relative to weight and maturity of Australian Dorset Horn rams and wethers. Animal Production 39, 251–258.Google Scholar
Doornenbal, H. (1972). Growth, development and chemical composition of the pig. 11. Fatty tissue and chemical fat. Growth 36, 185–194.Google Scholar
Graham, N. McC. & Searle, T. W. (1972). Balances of energy and matter in growing sheep at several ages, body weights, and planes of nutrition. Australian Journal of Agricultural Research 23, 97–108.CrossRefGoogle Scholar
Graham, N. McC. & Searle, T. W. (1982). Energy and nitrogen utilization for body growth in young sheep from two breeds with differing capacities for wool growth. Australian Journal of Agricultural Research 33, 607–615.CrossRefGoogle Scholar
Lesson, S. & Summers, J. D. (1980). Production and carcass characteristics of the Large White turkey. Poultry Science 59, 1237–1245.CrossRefGoogle Scholar
McClelland, T. H., Bonaiti, B. & Taylor, St. C. S. (1976). Breed differences in body composition of equally mature sheep. Animal Production 23, 281–293.Google Scholar
McClelland, T. H. & Russel, A. J. F. (1972). The distribution of body fat in Scottish Blackface and Finnish Landrace lambs. Animal Production 15, 301–306.Google Scholar
Pattie, W. A. & Smith, M. D. (1964). A comparison of the production of F 1 and F 2 Border Leicester × Merino ewes. Australian Journal of Experimental Agriculture and Animal Husbandry 4, 80–85.CrossRefGoogle Scholar
Searle, T. W. (1970 a). Body composition in lambs and young sheep and its prediction in vivo from tritiated water space and body weight. Journal of Agricultural Science, Cambridge 74, 357–362.CrossRefGoogle Scholar
Searle, T. W. (1970 b). Prediction of body composition of sheep from tritiated water space and body weight – tests of published equations. Journal of Agricultural Science, Cambridge 75, 497–500.CrossRefGoogle Scholar
Searle, T. W., Graham, N. McC. & Donnelly, J. B. (1982). The effect of plane of nutrition on the body composition of two breeds of weaner sheep fed a high protein diet. Journal of Agricultural Science, Cambridge 98, 241–245.CrossRefGoogle Scholar
Searle, T. W., Graham, N. McC. & O'Callaghan, M.(1972). Growth in sheep. I. The chemical composition of the body. Journal of Agricultural Science, Cambridge 79, 371–382.CrossRefGoogle Scholar
Searle, T. W. & Griffiths, D. A. (1976 a). Differences in body composition between three breeds of sheep. Proceedings of the Australian Society of Animal Production 11, 57–60.Google Scholar
Searle, T. W. & Griffiths, D. A. (1976 b). The body composition of growing sheep during milk feeding, and the effect on composition of weaning at various body weights. Journal of Agricultural Science, Cambridge 86, 483–493.CrossRefGoogle Scholar
Wood, J. D., MacFie, H. J. H., Pomeroy, R. W. & Twinn, D. J. (1980). Carcass composition in four sheep breeds: the importance of type of breed and stage of maturity. Animal Production 30, 135–152.Google Scholar