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Wool follicle development, wool growth and body growth in lambs treated from birth with recombinantly derived bovine somatotropin

Published online by Cambridge University Press:  02 September 2010

Y. X. Sun ,
A. Michel ,
G. A. Wickham  and
S. N. McCutcheon
Y. X. Sun
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
A. Michel
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
G. A. Wickham
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
S. N. McCutcheon
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
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Abstract

The effect of recombinantly derived bovine somatotropin (bST) administration on wool follicle populations, wool growth and body growth was examined in young lambs. Romney × (Border Leicester × Romney) lambs were treated with bST at doses of 0·1 or 0·3 mg/kg live weight per day, or with excipient, commencing on the day of birth and continuing at weekly intervals until the last injection was given at 11 weeks of age. Concentrations of immunoreactive somatotropin in plasma were 19·2 (s.e. 2·1), 65·2 (s.e. 2·8) and 74·7 (s.e. 4·8) μgll in the control, low dose bST and high dose bST groups, respectively. Somatotropin treatment did not alter the density of primary (P) or secondary (S) follicles in the skin, or the S/P ratio, as measured by histological examination of mid-side skin biopsy samples at 14 weeks of age. Mid-side greasy and clean wool growth during weeks 2 to 14 of the study were increased (P < 0·05) in bST-treated lambs but treatment had no effect on wool growth during the immediate post-treatment period (weeks 14 to 22), or on yearling fleece weight or wool quality characteristics. Body growth was not altered by bST administration. It is concluded that bST treatment stimulates wool growth even in very young lambs but, contrary to the results of a previous study, does not alter the development of wool follicle populations.

Keywords

folliclesgrowthlambssomatotropinwool
Type
Research Article
Information
Animal Production , Volume 55 , Issue 1 , August 1992 , pp. 73 - 78
Copyright
Copyright © British Society of Animal Science 1992

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References

Burns, M. 1949. Studies on follicle population in relation to fleece changes in lambs of the English Leicester and Romney breeds. Journal of Agricultural Science, Cambridge 39: 64–79.Google Scholar
Burns, M. 1954. Observations on the development of the fleece and follicle population in Suffolk sheep. Journal of Agricultural Science, Cambridge 44: 86–99.CrossRefGoogle Scholar
Carter, H. B. 1943. Studies in the biology of skin and fleece of sheep. 1. The development and general histology of the follicle group in the skin of the Merino. Bulletin, Council for Scientific and Industrial Research, Australia, no. 164, pp. 7–21.Google Scholar
Eppard, P. J., Bauman, D. E. and McCutcheon, S. N. 1985. Effect of dose of bovine growth hormone on lactation of dairy cows. journal of Dairy Science 68:1109–1115.CrossRefGoogle ScholarPubMed
Ferguson, K. A. 1954. Prolonged stimulation of wool growth following injections of ox growth hormone. Nature, London 174: 411.Google Scholar
Flux, D. S., Mackenzie, D. D. S. and Wilson, G. F. 1984. Plasma metabolite and hormone concentrations in Friesian cows of differing genetic merit measured at two feeding levels. Animal Production 38: 377–384.Google Scholar
Fraser, A. S. and Short, B. F. 1960. The biology of the fleece. Commonwealth Scientific and Industrial Research Organisation, Australia. Animal Research Laboratories, technical paper, no. 3.Google Scholar
Gilmour, A. R. 1985. REG: a generalised linear models programme. Miscellaneous bulletin, Division of Agricultural Services, Department of Agriculture, New South Wales, no. 1.Google Scholar
Heird, C. E., Hallford, F. M., Spoon, R. A., Holcombe, D. W., Pope, T. C, Olivares, V. H. and Herring, M. A. 1988. Growth and hormone profiles in fine-wool ewe lambs after long-term treatment with ovine growth hormone. Journal of Animal Science 66: suppl. 1, p. 201 (abstr.).Google Scholar
Johnsson, I. D., Hart, I. C. and Butler-Hogg, B. W. 1985. The effects of exogenous bovine growth hormone and bromocriptine on growth, body development, fleece weight and plasma concentrations of growth hormone, insulin and prolactin in female lambs. Animal Production 41: 207–217.Google Scholar
Johnsson, I. D., Hathorn, D. J., Wilde, R. M., Treacher, T. T. and Butler-Hogg, B. W. 1987. The effects of dose and method of administration of biosynthetic bovine somatotropin on live-weight gain, carcass composition and wool growth in young lambs. Animal Production 44: 405–414.Google Scholar
Labban, F. M. 1957. The effect of growth hormone on wool follicles. Journal of Agricultural Science, Cambridge 49: 19–25.Google Scholar
Maddocks, I. G. and Jackson, N. 1988. Structural studies of sheep, cattle and goat skin. Commonwealth Scientific and Industrial Research Organisation, Division of Animal Production, Blacktown NSW.Google Scholar
Muir, L. A., Wien, S., Duquette, P. F., Rickes, E. L. and Cordes, E. H. 1983. Effects of exogenous growth hormone and diethylstilbestrol on growth and carcass composition of growing lambs. Journal of Animal Science 56:1315–1323.Google Scholar
Pullar, R. A., Johnsson, I. D., Chadwick, P. M. C. and Hart, I. C. 1986. Recombinant bovine somatotropin is growth promoting and lipolytic in fattening lambs. Animal Production 42: 433–434 (abstr.).Google Scholar
Reklewska, B. 1974. A note on the effect of bovine somatotrophic hormone on wool production in growing lambs. Animal Production 19: 253–255.Google Scholar
Ross, D. A. 1958. Rapid measurement of the fibre diameter of Romney crossbred wool by the airflow apparatus. New Zealand Journal of Science 1:127–142.Google Scholar
Rudall, K. M. and Wickham, G. A. 1965. Development of wool follicles and fibres on autoplastic grafts of stored foetal lamb skin. In Biology of the skin and hair growth (ed. Lyne, A. G., Short, B. F.), pp. 75–88. Angus and Robertson, Sydney.Google Scholar
Wagner, J. F. and Veenhuizen, E. L. 1978. Growth performance, carcass composition and plasma hormone levels in wether lambs when treated with growth hormone and thyrotropin. Journal of Animal Science 45: suppl. 1, p. 397 (abstr.).Google Scholar
Wheatley, I. S., Wallace, A. L. C. and Bassett, J. M. 1966. Metabolic effects of ovine growth hormone in sheep. Journal of Endocrinology 35: 341–353.Google Scholar
Wilhelmi, A. E., Fishman, J. B. and Russell, J. A. 1948. A new preparation of crystalline anterior pituitary growth hormone. Journal of Biological Chemistry 176: 735–745.Google Scholar
Wolfrom, G. W., Ivy, R. E. and Baldwin, C. D. 1985. Effects of growth hormone alone and in combination with Ralgro (zeranol) in lambs. Journal of Animal Science 60: suppl. I, p. 249 (abstr.).Google Scholar
Wynn, P. C, Wallace, A. L. C, Kirby, A. C. and Annison, E. F. 1988. Effects of growth hormone administration on wool growth in Merino sheep. Australian Journal of Biological Science 41:177–187.Google Scholar
Zainur, A. S., Tassell, R., Kellaway, R. C. and Dodemaide, W. R. 1989. Recombinant growth hormone in growing lambs: effects on growth, feed utilization, body and carcase characteristics and on wool growth. Australian Journal of Agricultural Research 40:195–206.CrossRefGoogle Scholar