Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-19T08:40:15.320Z Has data issue: false hasContentIssue false
  • English
  • Français

Local control of the onset of mammary extraction of plasma triglycerides during lactogenesis in the goat

Published online by Cambridge University Press:  01 June 2009

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

Summary

In five untreated goats, mammary extraction of plasma triglycerides increased at parturition. In five goats that had as much secretion as possible regularly removed from one mammary gland beginning on d 143 of gestation, the change of triglyceride extraction occurred several d before parturition in the emptied gland but at parturition in the contralateral control gland. The experimentally induced early increase of extraction of plasma triglycerides preceded the increase of prostaglandin Fα concentration in mammary secretion at parturition, and occurred despite abnormally high concentrations of progesterone in the secretion.

Type
Original Articles
Information
Journal of Dairy Research , Volume 57 , Issue 4 , November 1990 , pp. 489 - 493
Copyright
Copyright © Proprietors of Journal of Dairy Research 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

Annison, E. F., Linzell, J. L., Fazakerley, S. & Nichols, B. W. 1967 The oxidation and utilization of palmitate, stearate, oleate and acetate by the mammary gland of the fed goat in relation to their overall metabolism, and the role of plasma phospholipids and neutral lipids in milk fat synthesis. Biochemical Journal 102 637–647CrossRefGoogle ScholarPubMed
Brownhill, J., Stewart, H. J. & Thompson, G. E. 1985 Prepartum milking and the onset of secretion of milk fat in the goat. Journal of Physiology 366 291–298CrossRefGoogle ScholarPubMed
Gleeson, M. & Maughan, R. J. 1986 A simple enzymatic fluorimetric method for the determination of triglycerides in 10 μl of serum. Clinica Chimica Acta 156 97–104CrossRefGoogle Scholar
Heap, R. B., Gwyn, M., Laing, J. A. & Walters, D. E. 1973 Pregnancy diagnosis in cows; changes in milk progesterone concentration during the oestrous cycle and pregnancy measured by a rapid radioimmunoassay. Journal of Agricultural Science 81 151–157CrossRefGoogle Scholar
Heap, R. B. & Linzell, J. L. 1966 Arterial concentration, ovarian secretion and mammary uptake of progesterone in goats during the reproductive cycle. Journal of Endocrinology 36 389–399CrossRefGoogle ScholarPubMed
Kurz, G. & Wallenfels, K. 1974 Lactose and other β−D−galactosides. In Methods of Enzymatic Analysis-3, pp. 1180–1184 (Ed. Bergmeyer, H. U.). New York: Academic PressGoogle Scholar
Linzell, J. L. 1960 Mammary-gland blood flow and oxygen, glucose and volatile fatty acid uptake in the conscious goat. Journal of Physiology 153 492–509CrossRefGoogle ScholarPubMed
Linzell, J. L. & Peaker, M. 1974 Changes in colostrum composition and in the permeability of the mammary epithelium at about the time of parturition in the goat. Journal of Physiology 243 129–151CrossRefGoogle ScholarPubMed
Maule, Walker F. M. & Peaker, M. 1980 Local production of prostaglandins in relation to mammary function at the onset of lactation in the goat. Journal of Physiology 309 65–79CrossRefGoogle Scholar
Peaker, M. & Wilde, C. J. 1987 Milk secretion: autocrine control. News in Physiological Sciences 2 124–126Google Scholar
Snedecor, G. W. & Cochran, W. G. 1956 Statistical Methods, 5th ed.Ames, IA: Iowa State University PressGoogle Scholar
Thompson, G. E. 1989 Mammary extraction of plasma triglycerides in the cow during lactogenesis. Comparative Biochemistry and Physiology 94B 411–413Google Scholar