Hostname: page-component-8448b6f56d-gtxcr Total loading time: 0 Render date: 2024-04-24T16:57:33.067Z Has data issue: false hasContentIssue false
  • English
  • Français

Milk yield responses to sequential treatments with recombinant bovine somatotrophin and frequent milking in lactating goats

Published online by Cambridge University Press:  01 June 2009

Christopher H. Knight
Christopher H. Knight
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, UK
Get access Rights & Permissions [Opens in a new window]

Summary

Lactating goats routinely milked twice daily were used. Starting at peak lactation, two groups of five goats were milked three times daily unilaterally (right gland) for 6 weeks, then one group received recombinant bovine somatotrophin (BST) by daily injection for 6 weeks, and finally both groups were returned to unilateral thrice-daily milking (left gland) for 6 weeks. Thrice-daily milking increased milk yield significantly by 10·4%. As thrice-daily milking finished and BST treatment began there was a small (2·7%) but significant increase in whole-udder milk yield in the treated goats and a decline in the control goats; throughout the BST treatment period treated goats produced 14·3% more milk than controls. The effect of BST was the same in glands previously milked thrice daily as in those previously milked twice daily. Milk yield declined as BST treatment finished, but this decline was less in the glands that then began thrice-daily milking. The effect of milking frequency was similar in this period to that obtained earlier in the experiment, and was not different between goats that had previously received BST and those that had not. The results are discussed in relation to the proposed modes of action of BST and frequent milking, and possible interactions between the two.

Type
Original Articles
Information
Journal of Dairy Research , Volume 59 , Issue 2 , May 1992 , pp. 115 - 122
Copyright
Copyright © Proprietors of Journal of Dairy Research 1992

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

Akers, R. M. 1985 Lactogenic hormones: binding sites, mammary growth, secretory cell differentiation, and milk biosynthesis in ruminants. Journal of Dairy Science 68 501–519CrossRefGoogle ScholarPubMed
Bauman, D. E., Eppard, P. J., DeGeeter, M. J. & 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 1352–1362Google Scholar
Bennett, C. N., Knight, C. H. & Wilde, C. J. 1990 Regulation of mammary prolactin binding by secreted milk proteins. Journal of Endocrinology 127 Suppl. Abstr. 141Google Scholar
Campbell, P. G., Skaar, T. C., Vega, J. R. & Baumrucker, C. R. 1991 Secretion of insulin-like growth factor-I (IGF-I) and IGF-binding proteins from bovine mammary tissue in vitro. Journal of Endocrinology 128 219–228Google Scholar
Davis, S. R., Gluckman, P. D., Hodgkinson, S. C., Farr, V. C., Breier, B. H. & Burleigh, B. D. 1989 Comparison of the effects of administration of recombinant bovine growth hormone or N-Met insulin-like growth factor-I to lactating goats. Journal of Endocrinology 123 33–39Google Scholar
Gisi, D. D., Depeters, E. J. & Pelissier, C. L. 1986 Three times daily milking of cows in California dairy herds. Journal of Dairy Science 69 863–868Google Scholar
Glimm, D. R., Baracos, V. E. & Kennelly, J. J. 1990 Molecular evidence for the presence of growth hormone receptors in the bovine mammary gland. Journal of Endocrinology 126 R5–R8Google Scholar
Hillerton, J. E., Knight, C. H., Turvey, A., Wheatley, S. D. & Wilde, C. J. 1990 Milk yield and mammary function in dairy cows milked four times daily. Journal of Dairy Research 57 285–294CrossRefGoogle ScholarPubMed
Knight, C. H., Fowler, P. A. & Wilde, C. J. 1990 Galactopoietic and mammogenic effects of long-term treatment with bovine growth hormone and thrice daily milking in goats. Journal of Endocrinology 127 129–138CrossRefGoogle ScholarPubMed
McKinnon, J., Knight, C. H., Flint, D. J. & Wilde, C. J. 1988 Effect of milking frequency and efficiency on goat mammary prolactin receptor number. Journal of Endocrinology 119 Suppl. Abstr. 167Google Scholar
Peaker, M. & Wilde, C. J. 1988 Milk secretion: autocrine control. News in Physiological Sciences 2 124–126Google Scholar
Peel, C. J., Sandles, L. D., Quelch, K. J. & 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 41 135–142Google Scholar
Prosser, C. G., Fleet, I. R., Corps, A. N., Froesch, E. R. & Heap, R. B. 1990 Increase in milk secretion and mammary blood flow by intra-arterial infusion of insulin-like growth factor-I into the mammary gland of the goat. Journal of Endocrinology 126 437–443Google Scholar