Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-27T05:44:19.343Z Has data issue: false hasContentIssue false
  • English
  • Français

Production responses of New Zealand Friesian cows at pasture to exogenous recombinantly derived bovine somatotropin

Published online by Cambridge University Press:  02 September 2010

C. J. Hoogendoorn ,
S. N. McCutcheon ,
G. A. Lynch ,
B. W. Wickham  and
A. K. H. MacGibbon
C. J. Hoogendoorn
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
G. A. Lynch
Affiliation:
Farms Administration, Massey University, Palmerston North, New Zealand
B. W. Wickham
Affiliation:
Livestock Improvement Corporation, New Zealand Dairy Board, Hamilton, New Zealand
A. K. H. MacGibbon
Affiliation:
New Zealand Dairy Research Institute, Palmerston North, New Zealand
Get access

Abstract

Recombinantly derived bovine somatotropin (bST) was administered to 25 Friesian cows by 2-weekly injections of a controlled release formulation at a dose rate equivalent to 25 mg/day. Treatment commenced 7 to 11 weeks after calving and continued for 26 weeks. A comparable group of 25 cows treated only with the slow release vehicle served as a control. During the treatment period, administration of bST increased yields of milk (controls 2358 v. bST 2598 (pooled s.e. = 39·8) kg; P < 0·01), fat (107·4 v. 119·3 (pooled s.e. = 1·9) kg; (P < 0·01) and protein (84·7 v. 93·7 (pooled s.e. = 1·2) kg; (P < 0·001). Magnitude of the treatment effect was strongly influenced by season, being greatest in spring/early summer (weeks 1 to 13 of treatment) and autumn (weeks 19 to 25) but not significant during the intervening summer dry period when herbage yield was low. Voluntary intakes, as measured by indigestible marker techniques at weeks 7 to 8 and 12 to 13 of treatment, were not influenced by bST administration. However, the net loss of body condition experienced by bST-treated cows (0·3 condition score units) was not sufficient to explain their responses in yield of milk and milk components, suggesting that some responses in voluntary intake had occurred. Administration of bST had little effect on milk composition, fatty acid composition of milk fat, live weight, reproductive performance or milk yield in the subsequent lactation.

Keywords

dairy cowsgrazingmilk productionsomatotropin
Type
Research Article
Information
Animal Production , Volume 51 , Issue 3 , December 1990 , pp. 431 - 439
Copyright
Copyright © British Society of Animal Science 1990

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bauman, D. E., Eppard, P. J., Degeeter, M. J. and Lanza, G. M. 1985. Responses of high-producing dairy cows to long-term treatment with pituitary somatotropin and recombinant somatotropin. Journal of Dairy Science 68: 1352–1362.CrossRefGoogle ScholarPubMed
Bauman, D. E. and McCutcheon, S. N. 1986. The effects of growth hormone and prolactin on metabolism. Proceedings of the 6th International Symposium on Ruminant Physiology (ed. Milligan, L. P., Grovum, W. L. and Dobson, A.), pp. 436–455. Prentice-Hall, New Jersey.Google Scholar
Brumby, P. J. and Hancock, J. 1955. The galactopoietic role of growth hormone in dairy cattle. New Zealand Journal of Science and Technology 36: 417–436.Google Scholar
Earle, D. F. and McGowan, A. A. 1979. Evaluation and calibration of an automated rising plate meter for estimating dry matter yield of pasture. Australian Journal of Experimental Agriculture and Animal Husbandry 19: 337–343.CrossRefGoogle Scholar
Eppard, P. J., Bauman, D. E., Bitman, J., Wood, D. L., Akers, R. M. and House, W. A. 1985. Effectof dose of bovine growth hormone on milk composition: or-lactalbumin, fatty acids and mineral elements. Journal of Dairy Science 68: 3047–3054.CrossRefGoogle 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
Gray, I. K. 1973. Seasonal variations in the composition and thermal properties of New Zealand milk fat. I. Fatty-acid composition. Journal of Dairy Research 40: 207–214.CrossRefGoogle ScholarPubMed
Holmes, C. W. and Wilson, G. F. 1984. Milk Production from Pasture. Butterworths, Wellington.Google Scholar
McBride, B. W., Burton, J. L. and Burton, J. H. 1988. The influence of bovine growth hormone (somatotropin) on animals and their products. Research and Development in Agriculture 5: 1–21.Google Scholar
MacGibbon, A. K. H. 1988. Modified method of fat extraction for solid fat content determination. New Zealand Journal of Dairy Science and Technology 23: 399–403.Google Scholar
MacGibbon, A. K. H. and McLennan, W. D. 1987. Hardness of New Zealand patted butter: seasonal and regional variations. New Zealand Journal of Dairy Science and Technology 22: 143–156.Google Scholar
Michel, A., McCutcheon, S. N., MacKenzie, D. D. S., Tait, R. M. and Wickham, B. W. 1990. Effects of exogenous bovine somatotropin on milk yield and pasture intake in dairy cows of low or high genetic merit. Animal Production 51: 229–234.Google Scholar
Moller, K., Lapwood, K. R. and Marchant, R. M. 1986. Prolonged service intervals in cattle. New Zealand Veterinary Journal 34: 128–132.CrossRefGoogle ScholarPubMed
Moran, J. B., Lemerle, C. and Trigg, T. E. 1987. Excretion patterns of chromium sesquioxide in dairy cows and sheep. Journal of the Australian Institute of Agricultural Science 53: 290–292.Google Scholar
Nes, P. 1975. A correction for soil contamination of herbage samples by dry ashing. New Zealand Journal of Agricultural Research 18: 69–71.CrossRefGoogle Scholar
Parker, W. J., McCutcheon, S. N. and Carr, D. H. 1989. Effects of herbage type and level of intake on the release of chromic oxide from intraruminal controlled release capsules in sheep. New Zealand Journal of Agricultural Research 32: 537–546.CrossRefGoogle Scholar
Peel, C. J., Sandles, L. D., Quelch, K. J. and Herington, A. C. 1985. The effects of long-term administration of bovine growth hormone on the lactational performance of identical-twin dairy cows. Animal Production 41: 135–142.Google Scholar
Pont, E. G. 1955. A de-emulsification technique for use in the peroxide test on the fat of milk, cream, concentrated and dried milks. Australian Journal of Dairy Technology 10: 72–75.Google Scholar
Putte, K. van and Enden, J. van den. 1974. Fully automated determination of solid fat content by pulsed NMR. Journal of the American Oil Chemists Society 51: 316–320.CrossRefGoogle Scholar
Roughan, P. G. and Holland, R. 1977. Predicting invivo digestibilities of herbages by exhaustive enzymic hydrolysis of cell walls. Journal of the Science of Food and Agriculture 28: 1057–1064.CrossRefGoogle Scholar