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Responses in adipocyte dimensions to divergent selection for predicted carcass lean content in sheep
Published online by Cambridge University Press: 02 September 2010
Abstract
Adipocyte dimensions of subcutaneous fat, sampled by biopsy at the 13th rib, were measured in 20-week-old rams from lines of Texel-Oxford and Scottish Blackface sheep, both divergently selected for carcass lean content. A total of 163 animals were measured, with close to equal numbers per breed-line combination. In both breeds, the high (lean) selection line had significantly lower backfat depths (0·71 mm in the Texel-Oxford and 0·83 mm in the Scottish Blackface, s.e.d. = 0·14 and 0·13 mm, respectively), but body weight did not differ between the lines. The ultrasonic fat depth differences between the Texel-Oxford selected lines were accompanied by increases in adipocyte diameter, area, diameter standard deviation within each sample and implied cell number, calculated as the ratio of ultrasonic fat depth to average adipocyte diameter. In the Scottish Blackface sheep there were no selection line differences in adipocyte dimensions, but there was an increase in implied cell number in the line selected for increased fatness. Across breeds, ultrasonic fat depth was correlated with both adipocyte diameter and implied adipocyte number (r = 0·58 and 0·75, respectively), but these latter two measurements were uncorrelated with each other.
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- Copyright © British Society of Animal Science 1995
References
Bishop, S. C. 1993. Selection for predicted carcass lean content in Scottish Blackface sheep. Animal Production 56: 379–386.Google Scholar
Bishop, S. C. 1994. Genetic relationships between predicted and dissected carcass composition in Scottish Blackface sheep. Animal Production 59: 421–427.Google Scholar
Cameron, N. D., Bishop, S. C., Speake, B. K., Bracken, J. and Noble, R. C. 1994. Lipid composition and metabolism of subcutaneous fat in sheep divergently selected for carcass lean content. Animal Production 58: 237–242.CrossRefGoogle Scholar
Cameron, N. D. and Bracken, J. 1992. Selection for carcass lean content in a terminal sire breed of sheep. Animal Production 54: 367–377.Google Scholar
Cartwright, A. L., Prince, T. J. and Kuhlers, D. L. 1984. Effects of selection for body weight at 200 days of age on adipose cellularity in swine. Journal of Animal Science 59: suppl. 1, p. 209 (abstr.).Google Scholar
Cianzio, D. S., Topel, D. G., Whitehurst, G. B., Beitz, D. C. and Self, H. L. 1985. Adipose tissue growth and cellularity: changes in bovine adipocyte size and number. Journal of Animal Science 60: 970–976.CrossRefGoogle ScholarPubMed
Eisen, E. J., Hayes, J. F., Allen, C. E., Bakker, H. and Nagai, J. 1978. Cellular characteristics of gonadal fat pads, livers and kidneys in two strains of mice selected for rapid growth. Growth 42: 7–25.Google ScholarPubMed
Hood, R. L. and Pym, R. A. E. 1982. Correlated responses for lipogenesis and adipose tissue cellularity in chickens selected for body weight gain, food consumption, and food conversion efficiency. Poultry Science 61: 122–127.CrossRefGoogle Scholar
Hood, R. L. and Thornton, R. F. 1979. The cellularity of ovine adipose tissue. Australian journal of Agricultural Research 30: 153–161.CrossRefGoogle Scholar
Kadim, I. T., Purchas, R. W., Rae, A. L. and Barton, R. A. 1989. Carcass characteristics of Southdown rams from high and low backfat selection lines. New Zealand Journal of Agricultural Research. 32: 181–191.CrossRefGoogle Scholar
Lawes Agricultural Trust. 1983. Clnstat a general statistical program. Numerical Algorithms Group Limited.Google Scholar
Martin, R., White, J., Herbein, J. and Ezekwe, M. O. 1979. Muscle development and adipose cell development in mice selected for postweaning growth rate. Growth 43: 167–173.Google ScholarPubMed
Robelin, J. 1981. Cellularity of bovine adipose tissues: developmental changes from 15 percent to 65 percent mature weight. Journal of Lipid Research 22: 452–457.CrossRefGoogle ScholarPubMed
Simm, G. 1992. Selection for lean meat production in sheep. In Progress in sheep and goat research (ed. Speedy, A. W.), pp. 193–215. CAB International.Google Scholar
Sinnett-Smith, P. A. and Waddington, D. 1992. Size distribution of adipocytes and variation in adipocyte number in lines of mice selected for high or low body fat. Comparative Biochemistry and Physiology 102A: 575–578.Google Scholar
Sinnett-Smith, P. A. and , Woolliams. 1987. Adipose tissue and metabolism and cell size: variation between subcutaneous sites and the of copper supplementation. Animal Production 45: 75–80.Google Scholar
Sinnett-Smith, P. A. and Woolliams, J. A. 1988. Genetic variations in subcutaneous adipose tissue metabolism in sheep. Animal Production 47: 263–270.Google Scholar
Thompson, J. M. and Butterfield, R. M. 1988. Changes in body compositon relative to weight and maturity of Australian Dorset horn rams and wethers. 4. Adipocyte volume and number in dissected fat partitions. Animal Production 46: 387–393.CrossRefGoogle Scholar
Thompson, J. M., Butterfield, R. M. and Reddacliffe, K. J. 1988. Food intake, growth and body composition in Australian Merino sheep selected for high and low weaning weight. 5. Adipocyte volume and number in the dissected fat partitions. Animal Production 46: 395–402.CrossRefGoogle Scholar
Truscott, T. G., Wood, J. D. and Denny, H. R. 1983. Fat deposition in Hereford and Friesian steers. 2. Cellular development of the major fat depots. Journal of Agricultural Science, Cambridge 100: 271–276.CrossRefGoogle Scholar
Vernon, R. G. 1980. Lipid metabolism in the adipose tissue of ruminant animals. Progress in Lipid Research 19: 23–106.CrossRefGoogle ScholarPubMed
Vernon, R. G. 1986. The growth and metabolism of adipocytes. In Control and manipulation of animal growth, (ed. Buttery, P., Lindsay, D. B. and Haynes, N. B.), pp. 67–93. Butterworths, London.CrossRefGoogle Scholar