The concentration of iron (Fe) in the milk and serum of sheep was determined before and during experimental intramammary infection (IMI) by coagulase-negative staphylococci (C-NS). Fe concentration of normal milk and serum samples was 0.24 microgram/mL and 1.56 micrograms/mL respectively. Presence of C-NS in the mammary gland resulted in a significant increase in milk-iron concentration (p < 0.001) and a decrease in the serum-iron concentration. Serum-iron concentration was significantly decreased (p = 0.04) one d after the intramammary introduction of C-NS and 29 d later (p = 0.03).
The selenium concentration of cereal grain and herbage from 131 farms in England and Wales was, in general, low: the proportions of samples with values below 0-03 mg/ kg D.M. were 60 % for grain (primarily barley, from 96 farms) and 39 % for conserved herbage (primarily hay, from 131 farms). Values for fresh herbage from 12 farms were similar to those for conserved herbage. There were no significant differences in selenium concentration among herbage species. For all samples, those from the Cambridge area contained more selenium than those from other parts of England and Wales.
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