Lactoferrin and citrate concentrations at drying-off and during early mammary involution of dairy cows |
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Authors: | Kutila T Pyörälä S Kaartinen L Isomäki R Vahtola K Myllykoski L Saloniemi H |
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Institution: | Department of Clinical Veterinary Science, Faculty of Veterinary Medicine, PO Box 57, FIN-00014 University of Helsinki, Helsinki, Finland. taina.kutila@helsinki.fi |
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Abstract: | Quarter milk samples were taken from 48 clinically healthy, pregnant Finnish Ayrshire and Friesian dairy cows at the last milking before drying-off, and 2 and 6 days later to determine the lactoferrin and citrate concentrations in the udder secretion. The mean lactoferrin concentration in the milk increased from 5.29 mg ml(-1) on the last day of drying-off process to 8.09 and 11.26 mg ml(-1), 2 and 6 days later, respectively. Citrate concentration decreased from 1.85 mg ml(-1) to 1.54 and 1.09 mg ml(-1), respectively. Median molar ratio (citrate to native-Lf) decreased from 153 to 86 and further to 44. Lf and citrate concentrations in milk varied greatly among cows. Sampling time had a statistically significant effect on lactoferrin and citrate concentrations in milk while the breed and the parity of the cows had no effect on either of these variables. |
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