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Measurement of the quantity of lactose passing into mammary venous plasma and lymph in goats and in a cow

Published online by Cambridge University Press:  01 June 2009

N. J. Kuhn  and
J. L. Linzell
N. J. Kuhn
Affiliation:
Agricultural Research Council Institute of Animal Physiology, Babraham, Cambridge
J. L. Linzell
Affiliation:
Agricultural Research Council Institute of Animal Physiology, Babraham, Cambridge
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Summary

Lactose in the plasma of 12 lactating goats and one cow with healthy udders has been measured by a sensitive and specific enzymic assay. Mean values (±S.E.) for arterial and venous concentrations were 52±11 µM and 70±11 µM respectively. Simultaneous measurement of mammary blood flow, milk yield and milk lactose concentration showed that 2·70±0·25% (mean±S.E.) of the total lactose production passed into the plasma. This rose to 42·7% in a goat when milking was suspended for 46 h. No lactose was found in the plasma of male and non-lactating female goats, but it was detected 4 days before parturition in a nulliparous goat.

Type
Original Articles
Information
Journal of Dairy Research , Volume 37 , Issue 2 , June 1970 , pp. 203 - 208
Copyright
Copyright © Proprietors of Journal of Dairy Research 1970

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