Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-23T06:43:36.076Z Has data issue: false hasContentIssue false
  • English
  • Français

Concentrations of LH and oestradiol-17β in plasma of the dairy cow during the post-partum acyclic period

Published online by Cambridge University Press:  02 September 2010

Elaine D. Watson
Elaine D. Watson
Affiliation:
AFRC Institute for Research on Animal Diseases, Compton, Newbury, Berkshire RG16 ONN
Get access

Abstract

The concentrations of LH and oestradiol-17β were measured in samples of jugular venous plasma collected frequently during an 8-h period from six acyclic cows between 21 and 27 days post partum. Fluctuations in oestradiol-17β concentrations were detected. Although the mean concentrations of oestradiol were similar whether ovulation occurred within 1 week of sampling or not, the amplitude of the fluctuations in oestradiol concentrations was greater in the three cows which ovulated within 1 week of the period of sampling. Increases in the concentration of LH were frequently followed by increases in the concentrations of oestradiol.

Type
Research Article
Information
Animal Production , Volume 45 , Issue 1 , August 1987 , pp. 1 - 8
Copyright
Copyright © British Society of Animal Science 1987

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

Abeyawardene, S. A. 1985. Studies of the concentrations of oestradiol-17p and progesterone in plasma and milk of cows and goats and a study of the relationship between steroids and luteinising hormone during the bovine oestrous cycle. Ph.D. Thesis, University of Reading.Google Scholar
Baird, D. T. 1978. Pulsatile secretion of LH and ovarian estradiol during the follicular phase of the sheep estrous cycle. Biology of Reproduction 18: 359–364.CrossRefGoogle ScholarPubMed
Baird, D. T., Swanston, I. and Scaramuzzi, R. J. 1976. Pulsatile release of LH and secretion of ovarian steroids in sheep during the luteal phase of the estrous cycle. Endocrinology 98: 1490–1496.CrossRefGoogle ScholarPubMed
Dobson, H. and Dean, P. D. G. 1974. Radioimmunoassay of oestrone, oestradiol-17α and -17β i n bovine plasma during the oestrous cycle and last stages of pregnancy. Journal of Endocrinology 61: 479–486.CrossRefGoogle Scholar
Peters, A. R. 1984. Effect of exogenous oestradiol-17β on gonadotrophin secretion in post-partum beef cows. Journal of Reproduction and Fertility 72: 473–478.CrossRefGoogle ScholarPubMed
Peters, A. R., Lamming, G. E. and Fisher, M. W. 1981. A comparison of plasma LH concentrations in milked and suckling post-partum cows. Journal of Reproduction and Fertility 62: 567–573.CrossRefGoogle ScholarPubMed
Peters, A. R., Pimentel, M. G. and Lamming, G. E. 1985. Hormone responses to exogenous GnRH pulses in post-partum dairy cows. Journal of Reproduction and Fertility 75: 557–565.CrossRefGoogle ScholarPubMed
Rawlings, N. C., Weir, L., Todd, B., Manns, J. and Hyland, J. H. 1980. Some endocrine changes associated with the post-partum period of suckling beef cows. Journal of Reproduction and Fertility 60: 301–308.CrossRefGoogle Scholar
Schallenberger, E. and Hutterer, G. 1982. Frequent pulsatile LH secretions is a prerequisite for a stimulatory feedback action of oestradiol and the reestablishment of oestrous cycles post partum in dairy cows. Ada Endocrinologica, Copenhagen 99: Suppl. 246, pp. 167–171.Google Scholar
Walters, D. L., Schams, D., Bullermann, B. and Schallenberger, E. 1983. Pulsatile secretion of gonadotrophins, ovarian steroids and ovarian oxytocin during luteolysis in the cow. Biology of Reproduction 28: Suppl. 1, p. 142 (Abstr.).Google Scholar
Walters, D. L., Schams, D. and Schallenberger, E. 1984. Pulsatile secretion of gonadotrophins, ovarian steroids and ovarian oxytocin during the luteal phase of the oestrous cycle in the cow. Journal of Reproduction and Fertility 71: 479–491.CrossRefGoogle ScholarPubMed
Walton, J. S., McNeilly, J. R., McNeilly, A. S. and Cunningham, F. J. 1977. Changes in concentrations of follicle-stimulating hormone, luteinizing hormone, prolactin and progesterone in the plasma of ewes during the transition from anoestrous to breeding activity. Journal of Endocrinology 75: 127–136.CrossRefGoogle Scholar