New Zealand Journal of
Agricultural Research abstracts
Short
communication
Ingestion
of
soil
fluorine: its impact on the fluorine metabolism of dairy cows
N. D. Grace1
P. Loganathan2
M. W. Deighton1
G. Molano1
M. J. Hedley2
1AgResearch
Limited
Grasslands
Research Centre
Private Bag 11 008
Palmerston North, New Zealand
email: neville.grace@agresearch.co.nz
2Fertilizer
and Lime Research
Centre
Institute of
Natural Resources
Massey University
Private Bag 11 222
Palmerston North, New Zealand
Abstract In
grazing cattle high fluoride (F)
intakes are associated with soil ingestion. The ingestion of soil (F)
(93% of dietary F) at a rate of 1562 mg F day–1
by mature
dairy cows over 63 days, when compared with animals on basal diet (no
soil) providing 110 mg F day–1,
resulted in an increase in
mean serum F concentrations from 0.10 to 0.22 mg litre–1,
and no detectable change in mean metacarpal F concentrations (1125 mg F
kg–1 DM),
while the apparent absorption of soil F was 44%.
However, an intake of soil F (77% of dietary F) at 446 mg F day–1 had
no detectable effect on mean serum or bone F concentrations of the
dairy cows. The relationship between soil F intake (x)
and serum
F concentration (y)
was curvilinear (y
= 0.0837e0.0007x).
The observed changes in serum and bone concentrations indicate that the
potential risk of fluorosis occurring in grazing dairy cows is very
low.
Keywords dairy
cows; fluorine; soil fluorine
intake; serum fluorine; bone fluorine; apparent fluorine absorption
A04017; Received 4 March 2004;
accepted 3 November 2004, Online
publication date 21 March 2005
New Zealand Journal of
Agricultural Research, 2005, Vol. 48:
23–27
0028–8233/05/4801–0023 © The Royal Society of New Zealand 2005
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