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Concentration of citrate in the mammary secretion of sows during lactogenesis II and established lactation

Published online by Cambridge University Press:  01 June 2009

Mark A. Holmes  and
Peter E. Hartmann
Mark A. Holmes
Affiliation:
Department of Chemistry, University of Central Queensland, Rockhampton, QLD 4702, Australia
Peter E. Hartmann
Affiliation:
Department of Biochemistry, The University of Western Australia, Nedlands, WA 6009, Australia
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Summary

The functional significance of citrate in the mammary secretion of six sows was investigated during the second stage of lactogenesis (lactogenesis II) and established lactation. The changes in the concentrations of progesterone and lactose in the maternal blood, and lactose, Na and K in the mammary secretion, suggested that lactogenesis II began during the final day of pregnancy. The concentration of citrate in the mammary secretion of the sows during lactogenesis II was high and varied from 5·4 (SEM 0·5) mai at day 0·5 post partum to 6·8 (SEM 0·4) mM at day 1·5 post partum. There was a decline of ˜ 30% in the concentration of citrate in the milk of sows during the first week of lactation. These findings suggest that, in contrast to all other species studied previously, milk citrate is not a harbinger of lactogenesis II in the sow. However, the changes in the concentration of citrate in the mammary secretion of sows may reflect changes in the rate of de novo synthesis of fatty acids that take place in the mammary glands of sows during lactogenesis II and established lactation.

Type
Original Articles
Information
Journal of Dairy Research , Volume 60 , Issue 3 , August 1993 , pp. 319 - 326
Copyright
Copyright © Proprietors of Journal of Dairy Research 1993

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References

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